These trucks are much stiffer and ride less comfortably than the standard Sierra 1500 (1/2 ton). They are designed for hard work with a 3/4-ton load capacity. The ride is bouncy but the available engines include a relatively refined, Isuzu-developed 6.6-liter turbodiesel V8 mated to a smooth six-speed automatic. A huge 8.1-liter V8 is also available. These trucks are intended for commercial use or heavy-duty towing.
Alerts
There are 3 recalls on this vehicle. Learn More.

Road Test Results

Performance
Acceleration Acceleration Acceleration tests are conducted on a smooth, flat pavement straightaway at the track. Time, speed, and distance measurements are taken with a precise GPS-based device that’s hooked to a data-logging computer.
NA
0 to 60 mph 0 to 60 mph (sec.) The time in seconds that a vehicle takes to reach 60 mph from a standstill with the engine idling.
Transmission Transmission Transmission performance is determined by shifting smoothness, response, shifter action, and clutch actuation for manual transmissions.
NA
Braking Braking The braking rating is a composite of wet and dry stopping distances and pedal feel. Braking distance is from 60 mph, with no wheels locked.
NA
Emergency Handling Emergency Handling Several factors go into the rating, including the avoidance maneuver speed and confidence, as well as how the vehicle behaves when pushed to its limit.
NA
Comfort / Convenience
Ride Ride Our expert judgment of how well the suspension isolates and absorbs road imperfections and how steady it keeps the body on various road surfaces.
NA
Noise Noise Our expert judgment of the vehicle's interior noise level in everyday driving.
NA
Front Seat Comfort Front Seat Comfort Our judgment of how comfortable the front seat is for drivers of various heights.
NA
Rear Seat Comfort Rear Seat Comfort Our judgment of how comfortable the rear seat is for two passengers to sit across.
NA
Interior Fit and Finish Interior Fit and Finish An expert evaluation of the interior quality and craftsmanship.
NA
Trunk/Cargo Area Trunk/Cargo Area Our rating is based on the amount of luggage or cargo space that a vehicle has in the trunk or cargo area.
NA
Fuel Economy & Emissions
Fuel Economy Fuel Economy We perform our own fuel-economy tests, independent of the government's often-quoted EPA figures and the manufacturers' claims. Using a precise fuel-flow measuring device spliced into the fuel line, we run two separate circuits to represent city and highway consumption.
NA
CR's Overall Mileage CR's Overall Mileage CR's overall mileage is a composite of measured fuel usage on a prescribed city course and highway cruising; and CR's 150-mile test trip of mixed driving, if tested. In recent road tests, we've discontinued the 150-mile trip test.
CR's City Mileage CR's City Mileage Measured fuel usage on a prescribed city course.
CR's Highway Mileage CR's Highway Mileage Measured fuel usage on a prescribed highway cruising.
Annual Fuel Cost Annual Fuel Cost The cost and amount of fuel used in 12,000 miles and is calculated from CR's overall mileage.
Greenhouse Gas Greenhouse Gas The Greenhouse Gas Rating represents the amount of carbon dioxide the vehicle emits compared to other vehicles of the same model year. This score from the EPA ranges from 1 (worst) to 10 (best).
NA
Smog Rating Smog Rating The Smog Rating represents the amount of health-damaging and smog-forming airborne pollutants the vehicle emits compared to other vehicles of the same model year. This score from the EPA ranges from 1 (worst) to 10 (best).
NA

Owner Reports

Worse Better
Reliability History Reliability History The reliability charts are based on responses on hundreds of thousands of vehicles from our latest Annual Auto Survey. Consumer Reports subscribers reported on any serious problems they had with their vehicles during the past 12 months that they considered serious because of cost, failure, safety, or downtime, in any of the trouble spots included in the table below. The results are presented relative to the average model that year. Extra weight is given to the more serious areas such as major engine or transmission problems. Based on this data and further analysis, we predict reliability for the latest year. N/A indicates that we did not receive a large enough sample size to provide data for a specific year. An X indicates that the vehicle was not manufactured for a specific year.
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
NA
2011
2012
NA
2013
2014
2015
2016
2017
2018
2019
2020
Reliability Trouble Spots
Engine Major Engine Major Engine rebuild or replacement, cylinder head, head gasket, turbo or supercharger, timing chain or timing belt.
NA
Engine Minor Engine Minor Accessory belts and pulleys, engine computer, engine mounts, engine knock or ping, oil leaks.
NA
Engine Cooling Engine Cooling Radiator, cooling fan, antifreeze leaks, water pump, thermostat, overheating.
NA
Transmission Major Transmission Major Transmission rebuild or replacement, torque converter, clutch replacement.
NA
Transmission Minor Transmission Minor Gear selector or linkage, leaks, transmission computer, transmission sensor or solenoid, clutch adjustment, rough shifting, slipping transmission.
NA
Drive System Drive System Driveshaft or axle, CV joint, differential, transfer case, 4WD/AWD components, driveline vibration, traction control, electronic stability control (ESC), electrical failure.
NA
Owner Satisfaction Owner Satisfaction To learn about satisfaction, CR has collected survey data from our annual survey on more than half a million vehicles. Our subscribers provide great insights into their satisfaction by answering one simple question: If they had it to do all over again, would they definitely buy or lease the same model? In addition, respondents also rate their cars in six categories: driving experience, comfort, value, styling, audio, and climate systems. N/A indicates that we did not receive a large enough sample size to provide data for a specific year. An X indicates that the vehicle was not manufactured for a specific year.
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
Driving Experience Driving Experience Includes acceleration and handling
Comfort Comfort Includes seats, climate control, noise, and ride
Value Value Did you get what you wanted relative to the price you paid?
Styling Styling How it looks inside and out
Safety Equipment
ABS standard. ESC available from 2009, standard from 2011. Side and head protection air bags available from 2011.
Model Summary
These trucks are much stiffer and ride less comfortably than the standard Sierra 1500 (1/2 ton). They are designed for hard work with a 3/4-ton load capacity. The ride is bouncy but the available engines include a relatively refined, Isuzu-developed 6.6-liter turbodiesel V8 mated to a smooth six-speed automatic. A huge 8.1-liter V8 is also available. These trucks are intended for commercial use or heavy-duty towing.
Seating
3 front, 3 rear
Drive Wheels
4WD , Rear
Warranty
Coverage varies among versions of this vehicle

In most cases, automotive warranties are based on the vehicle identification number (VIN), and the warranty will be valid regardless of ownership. The dealership can tell you exactly how much warranty is left.

Read more about extended warranties
Body Styles
extended cab
regular cab
crew cab
Transmissions Available
  • 6-speed Automatic
  • 5-speed Manual
  • 4-speed Automatic
  • 6-speed Manual
Engines Available
  • 6-liter V8 (300 hp)
  • 6.6-liter V8 turbodiesel (360 hp)
  • 6.6-liter V8 turbodiesel (310 hp)
  • 8.1-liter V8 (330 hp)

Owner Reported Trouble Spots

The Reliability score is based on our latest subscriber survey of 2006 GMC Sierra 2500HD owners. The owner comments describe problems respondents experienced with this vehicle.

Brakes

Antilock system (ABS), parking brake, master cylinder, calipers, rotors, pulsation or vibration, squeaking, brake failure or wear.

What Owners Say

Antilock system (ABS)

"The ABS system goes out at non regular intervals. The truck has been worked on numerous times with the mechanic working with GMC and no solution as worked"

Onstad R., SC (2006 GMC Sierra 2500HD 6.6-L V8 diesel)
Calipers

"I have had to replace both rotors and both calipers in the last 10 yrs. That seems a lot for 85000 miles"

Richard A., ME (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"Bolts holding the caliper were sheared off and caused the caliper to become loose and rattle"

Anonymous, MI (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"pads, rotors, etc completely rusted out. Dealer recommended replace everything. Don't know why. weather, locale, mag chloride, etc"

R S., CO (2006 GMC Sierra 2500HD)

"Seizing, road salt and tight tolerances. Fuel line leak is "other" repair due to corrosion from road salt."

Anonymous, (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Master cylinder

"Brake's started engaging and stopping truck while driving had to stop shut truck off which reset computer, had to replace computer chip an master cylinder. My GMC dealer wouldn't even discuss problem when i called to report what happened as a saftey concern !"

Rob G., (2006 GMC Sierra 2500HD SL 6.0-L V8)
Parking brake

"The pking brake is inside the rear wheel and in order to fix it you may have to remove the rear axle but even if you don't it costs about 800.00 to 1000.00 dollars. It was making a noise so I talked to my mechanic. I said I used it all the time so it wasn't stuck. I pushed on the pedal one day and it went to the floor. I just can't justify that kind of money"

Richard A., ME (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Premature brake wear

"The brake system was leaking excessively to the point of total brake failure. I was told the brake lines were leaking. Mechanics changed all lines and the system is now working satisfactorily"

Anonymous, MD (2006 GMC Sierra 2500HD 6.6-L V8 diesel)

"Calipers did not make full contact which created premature and increased rotor wear"

Anonymous, UT (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"lost brakes due to rust out failure of front to rear brake lines"

Anonymous, PA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Rotors

"Brake pad came loose from caliper and destroyed rotor"

Mark P., RI (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"seems like insides rust up every two years on all four"

Richard C., MI (2006 GMC Sierra 2500HD WT 6.0-L V8)

"I have had to replace pads rotors wheel bearings or calipers 2 or 3 times in the last 2 years"

Richard A., ME (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"i live in "high corrosion state" road salt,moisture cause issues with brake systems chassis parts. Rust on brake lines required new brake lines and rotors at high cost ,manufacturer finally started using coated lines in 2008."

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)

Suspension

Shocks or struts, ball joints, tie rods, wheel bearings, alignment, steering linkage (includes rack and pinion), power steering (pumps and hoses, leaks), wheel balance, springs or torsion bars, bushings, electronic or air suspension.

What Owners Say

Power steering leaks

"Power steering hydraulic lines were leaking fluid. I replaced the pump and all the power steering hydraulic lines."

Anonymous, OR (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"steering gear began leaking in 2016,truck only had 120000 miles.power steering pump replaced in 2017. My older trucks didnt have these failures with more miles and harder use."

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Shocks or struts

"shock mounting bushings wore out"

Kenneth R., TX (2006 GMC Sierra 2500HD SL 6.0-L V8)
Steering linkage (includes rack and pinion)

"steering gear leaks,need to fix soon,truck has 150k miles.way too many repairs for low miles"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"worn pitman arm, idler arm, steering gear box engine: glow plug replacement and hydroboost assembly high pressure line"

Jennifer P., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"steering gear start to leak 6/17 ,new tie rod on rh outer,9/17"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Wheel bearings

"Front wheel bearings replaced and two months later had to replace one bearing again. Poor quality bearing. Used a better quality brg and is ok now"

Anonymous, BC (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"new front right hub april 2018, second time, need to replace"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"Noise/ vibration in right front"

William R., OH (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"Both front wheel bearings had to be replaced"

Anonymous, CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"rt front hub new for 2nd time ,factory hub worn at about 90000,installed new, rt front done again at 139000"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)

Paint/Trim

Paint (fading, chalking, cracking, or peeling), loose interior and exterior trim or moldings, rust.

What Owners Say

Loose exterior trim or moldings

"In the past 1 month the tailgate plastic handle and the passenger side rear tail light have come off"

Jennifer P., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Loose interior trim or moldings

"Headboard fabric lost hold and is hanging down by the windshield. The drivers door arm rest has come loose and is falling off"

Matthew G., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Paint (fading, chalking, cracking, or peeling)

"I had to have the hood and front fenders repainted. The body shop told me it was cracking because of the type and mixture of the paint during that time periods"

Jack C., TX (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"Paint on roof has peeled off, I will be having it repainted within the next 2 months"

Thomas P., CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"Paint peeling badly on top of cab"

Anonymous, OR (2006 GMC Sierra 2500HD SL 6.6-L V8 diesel)

"The paint (white) on the roof has peeled terribly."

Douglas S., NM (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"The paint started to peel about 4 years years. just i the last year the paint is coming off faster"

Anonymous, CA (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Rust

"cab corners rusting"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"same problem that is with all chevy/gmc trucks, around the rear wheel wells"

Anonymous, IL (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"typical rust locations for these vehicles"

Brad M., IL (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"The bottom of the right front door has rusted out, I believe, because the window is not set so that water won't get by it."

Richard A., ME (2006 GMC Sierra 2500HD SLE 6.0-L V8)

Climate System

Blower (fan) motor, A/C compressor, condenser, evaporator, heater system, automatic climate control, refrigerant leakage, electrical failure.

What Owners Say

Automatic climate control

"Driving home from Kentucky in 95 degree heat this past July, the A/C on the driver's side went completely out while the passenger side still worked. We had a grandchild in the back seat. Fortunately we got off the interstate and the temp went down outside. about 40 minutes later, we turned the A/C on and it worked. This has happened once since that time."

Marla W., GA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"System would refuse to come on"

Richard G., NV (2006 GMC Sierra 2500HD SLT 6.0-L V8)
Blower (fan) motor

"replaced blower motor and it mad so much noise I had to take it back and the motor was replaced again. Still noisy but better than before"

Anonymous, BC (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"The fan will only run on high"

Bruce R., ID (2006 GMC Sierra 2500HD SLT 6.0-L V8)

"blower fan only works on hi haven't had it fixed yet"

Anonymous, ID (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Heater system

"Same answer as previous!"

Anonymous, BC (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"The heater only works if temperature is at 90 degrees, which is the highest. Turn down to 89 degrees, the heat shuts off. Took it to dealership twice, but they couldn't figure out the problem"

Michelle T., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"motor quit"

Anonymous, BC (2006 GMC Sierra 2500HD SL 6.0-L V8)

"The heater wouldn't blow warm air. It had a bad sensor. Unit was replaced"

Anonymous, WA (2006 GMC Sierra 2500HD SL 6.6-L V8 diesel)
Refrigerant leaks

"Leak of cooling fluid."

Anonymous, FL (2006 GMC Sierra 2500HD SLT 6.0-L V8)

Fuel System

Check engine light, sensors (includes O2 or oxygen sensor), emission control devices (includes EGR), engine computer, engine computer, fuel cap, fuel gauge/sender, fuel injection system, fuel pump, fuel leaks, stalling or hesitation.

What Owners Say

Emission control devices (includes EGR)

"Recurring check engine light indicated EGR valve problem that didn't exist. Extensive testing resulted in reprogramming the computer to eliminate the problem"

C M., CT (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"check engine lite comes on. Check system reveal EGR. I would take it to chevy garage they would say they clean egr valve. The lite would come back a short time later. I changed garages they cleaned whole system. Seems to be ok now"

Anonymous, WA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Fuel cap

"I put a locking cap on check engine lite come. Reinstall would take care of it for awhile.I put original cap back on works fine"

Anonymous, WA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Fuel injection system

"Breakdown required new fuel injectors, injection pump & new lines - cost over $12,000. parts & labor"

George M., NY (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"The entire fuel system was cleaned, including the fuel injectors"

John S., CA (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"Engine periodically would not start. Had to push bulb to inject fuel until it would finally start."

Anonymous, LA (2006 GMC Sierra 2500HD 6.6-L V8 diesel)
Fuel pump

"While traveling, wouldn't start two times. @1800 in tow bills Private shop couldn't find anything wrong. Towed to our local dealer, new immediately issue. Warped fuel filter base plate. No tech bulletin for others to identify issue"

R S., CO (2006 GMC Sierra 2500HD)
Sensors (includes O2 or oxygen sensor)

"The Mass Air Flow sensor had to be replaced, the fuel injector cleaned"

John S., CA (2006 GMC Sierra 2500HD SLE 6.0-L V8)

Drive System

Driveshaft or axle, CV joint, differential, transfer case, 4WD/AWD components, driveline vibration, traction control, electronic stability control (ESC), electrical failure.

What Owners Say

4WD/AWD components

"Oil seal leak."

Anonymous, SC (2006 GMC Sierra 2500HD SLE 6.0-L V8)
CV joint

"boot on axle split"

Anonymous, BC (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Driveshaft or axle

"Bought truck from Used Car Dealer. Drive shaft was bent, rear differential needed to be replaced along with the rear bearings. No warning from the dealer that all this was going on"

Matthew G., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"Rotting"

Stoddard M., MA (2006 GMC Sierra 2500HD SL 6.0-L V8)

"Had to replace the drive shaft after I bought the truck from a used car dealer. I had it inspected at the new car dealer after I bought the truck, major mistake. The needed fixes: seat heaters, a/c blower, steering column, drive shaft, CD, OnStar"

Matthew G., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"The carrier bearing rubber bushing failed causing vibration while towing. It I going out again. Shop informed me that it they replace a lot of these on the diesel models"

Jeff C., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"CV boot was split, leaking grease"

Anonymous, AB (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Electrical failure

"if it sits for several weeks the battery goes dead I put new battery in it and still does it nobody can find out why it does it."

Anonymous, ID (2006 GMC Sierra 2500HD SLE 6.0-L V8)

Power Equipment

Cruise control, clock, warning lights, body control module, keyless entry, wiper motor or washer, tire pressure monitor, interior or exterior lights, horn, gauges, 12V power plug, remote engine start, alarm or security system

What Owners Say

Coil

"Have changed five of the eight coils!"

Anonymous, ON (2006 GMC Sierra 2500HD SL 6.0-L V8)
Spark plugs or wires failure

"We have replaced these (there are 8) at least 3 times each"

Anonymous, CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"Each glow plug has a little heater. One of the glow plug heaters went out. Costs $400 to replace it"

Matthew G., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"We have replace the Glow Plugs over 3 times on this truck"

Anonymous, CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Starter

"2 differant times in the past month the engine would not start and when trying to start consumed alot of batt. amps. mechanic hit starter w/ hammer and it started. he said problem was that these die. engins will get a worn spot in starter bearing, if"

Paul N., OR (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

Engine Cooling

Radiator, cooling fan, antifreeze leaks, water pump, thermostat, overheating.

What Owners Say

Cooling fan

"fan clutch for radiator failed,replaced 7-14 overheated in winter,new clutch under warranty"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Overheating

"Engine overheated when towing heavy loads. I replaced the thermostat, had the radiator cleaned and replaced the cooling fan. It works better now."

Anonymous, (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Thermostat

"Could not get any heat. Had to replace a blend door actuator. Also had to replace both thermostats. (Diesel engine)"

Anonymous, BC (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Water pump

"I started to see coolant under my truck. After inspection realized the water pump was starting to fail. I had the water pump replaced. However the shop did not tighten the turbo charge line tight enough and it blow off on the highway while towing our RV. Had to repair on the side of the road. Most shops do not want to perform repairs on the engine. Too difficult."

Jeff C., CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"Started leaking from the weep hole. Took to independent diesel mechanic and they fixed it. Fine ever since."

Anonymous, CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

Body Integrity

Squeaks, rattles, wind noises, loose or cracked seals and/or weather-stripping, air and water leaks.

What Owners Say

Air or water leaks

"Front door weather seals were not properly attached to door (had no weather strip adhesive on them)."

Anonymous, OR (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"waterpump"

Anonymous, NH (2006 GMC Sierra 2500HD SL 6.0-L V8)
Seals and/or weather-stripping

"sealing is allowing loud wind noise from top of driver's door."

Anonymous, MN (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Wind noise

"Had to replace rear windows. weatherstripping failure caused wind noise"

Anonymous, OR (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"In high cross winds wind noise occurs at both front doors."

Anonymous, OR (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

Transmission Minor

Gear selector or linkage, leaks, transmission computer, transmission sensor or solenoid, clutch adjustment, rough shifting, slipping transmission.

What Owners Say

Coolers and lines

"This is a major problem that stranded me. The transmission lines blew out and the truck shut down. Very expensive to repair"

Anonymous, UT (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Transmission leaks

"Front seal started leaking mildly. I don't like leaky vehicles. First issue with the transmission in well over 300K miles"

Marc W., NV (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"Rear main Seal has a slight leak with only 26000 miles on odometer"

Anonymous, MA (2006 GMC Sierra 2500HD SLT 6.0-L V8)

"transmission cooling line leaked just after I bought the truck, took 4 times to fix the issue"

Donald R., AK (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"Transmission line needed to be replaced. the parts were minimal cost, but the labor was very, very expensive"

Anonymous, WY (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

Electric System

Alternator, starter, hybrid battery and related systems, regular battery, battery cables, engine harness, coil, ignition switch, electronic ignition, distributor or rotor failure, spark plugs and wires failure.

What Owners Say

Gauges

"The back lights for the instrument cluster and A/C controls are starting to go out"

Daniel I., LA (2006 GMC Sierra 2500HD SL 6.6-L V8 diesel)
Heated or cooled seats

"Heated seat on driver's side comes on without being turned on, even in 98 degree heat. Rarely does it when air temp is cool or cold."

Marla W., GA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Interior lights

"The LED heater temp control failed - requires replacement of whole unit - - Many of the steering wheel pad switch lights no longer work - will require replacement with new - - GM uses junk electronic components !!!! - Don't last -"

George M., NY (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"some of the dash lights and climate control lights have gone out. The bulbs cannot be replaced since they are soldered on to a board. The complete instrument panel must be replaced. As you well know this has been a major problem for GM"

Jeff C., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

Engine Major

Engine rebuild or replacement, cylinder head, head gasket, turbo or supercharger, timing chain or timing belt.

What Owners Say

Engine rebuild or replacement

"no oil pressure, worked for 4 days to fix, only got oil pressure 1 time, metal in oil .game over,new motor"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)
Head gasket

"self inflicted problem;during quater-mile race, caused right side head to raise. did not notice for 2+ years until 1 day engine lost oil pressure. upon taking engine out disscoverd that oil-antifrezz and diesel had been "mixing together in engine""

Paul N., OR (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"The torque to yield bolts that GM and Ford use are junk. I had head studs installed. I noticed coolant leaking externally from the cylinder head gasket."

Anonymous, CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Turbo or supercharger

"The Turbo charger went out on my GMC with less than 75000 miles on the truck. It went out while pulling a travel trailer, really crappy. should have not burned the turbo out with less than 100,000 miles"

Donald R., AK (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

Transmission Major

Transmission rebuild or replacement, torque converter, clutch replacement.

What Owners Say

Transmission rebuild or replacement

"trans. began "slamming up" when upshift ,ck.engine light on,diagnose as torque converter fail. '"

Anonymous, WI (2006 GMC Sierra 2500HD SLE 6.0-L V8)

"had to replace transmission due to mechanical breakdown"

Anonymous, SK (2006 GMC Sierra 2500HD SL 6.6-L V8 diesel)

"It is a gasket problem in the engine manifold. it failed and now I have to replace them. Over $5000 to fix this problem"

Richard G., ME (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

Engine Minor

Accessory belts and pulleys, engine computer, engine mounts, engine knock or ping, oil leaks.

What Owners Say

Fuel leaks

"I am starting to get an injector leaking. it is not bad enough to replace, but i soon will have to take care of it."

Jeff C., CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"Some of the brake lines replaced."

Anonymous, (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Oil leaks

"I noticed oil was leaking from the oil pan gasket. I use synthetic oil. I started using an oil supplement, Lucas oil stabilizer, and it fixed the problem. I have not had any leaks since."

Anonymous, (2006 GMC Sierra 2500HD SLE 6.0-L V8)

Body Hardware

Power or manual windows, locks and latches, tailgate, hatch or trunk, doors or sliding doors, mirrors, seat controls, safety belts, sunroof, convertible top.

What Owners Say

Tailgate, hatch or trunk

"In the past 6 months we have had an interior plastic reflector come off"

Jennifer P., CA (2006 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"The plastic trim fell off and the clip that holds the rod to release the latch for the tailgate keeps breaking, the clip costs over $8.00 it has been replaced several times. I quit replacing the plastic trim around the tailgate handle after the 3rd t"

Thomas P., CA (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

In-car Electronics

CD or DVD players, radio, speakers, GPS, communication system (e.g., OnStar), display screen freezes or goes blank, phone pairing (e.g. Bluetooth), voice control commands, steering wheel controls, portable music device interface (e.g., iPod/MP3 player), backup or other camera/sensors.

What Owners Say

CD player

"CD player would not load or eject CDs."

Douglas S., NM (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

Exhaust

Muffler, pipes, catalytic converter, exhaust manifold, leaks.

What Owners Say

Exhaust leaks

"I had Carbon Monoxide build up in my truck cab on 2 occasions this winter while plowing snow. I do not know the source yet"

Anonymous, MD (2006 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
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