The Sierra HD and its twin the Chevrolet Silverado HD are designed for heavy towing and hauling. The 6.0-liter V8 and 6.6-liter turbodiesel are both mated to a six-speed automatic. The latter works well, and employs a heavy-duty Allison-made transmission. We measured 14 mpg overall with the diesel. The LTZ trim has a luxurious cabin but ascending to into it is quite a climb.
Alerts
There are 11 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.
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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
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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
The Sierra HD and its twin the Chevrolet Silverado HD are designed for heavy towing and hauling. The 6.0-liter V8 and 6.6-liter turbodiesel are both mated to a six-speed automatic. The latter works well, and employs a heavy-duty Allison-made transmission. We measured 14 mpg overall with the diesel. The LTZ trim has a luxurious cabin but ascending to into it is quite a climb. If you don't plan to go off-road, the Z71 suspension is superfluous -- it makes the ride extremely stiff, bucking uncomfortably on every bump. The cabin is quiet but the diesel clatter is audible at low speeds. Handling is clumsy but ultimately secure. The HD pickups are the better choice for commercial purposes and lend themselves to snow-plowing duties.
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
Engines Available
  • 6-liter V8 (360 hp)
  • 6.6-liter V8 turbodiesel (397 hp)

Owner Reported Trouble Spots

The Reliability score is based on our latest subscriber survey of 2015 GMC Sierra 2500HD owners. The owner comments describe problems respondents experienced with this vehicle.

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

Backup or other camera/sensors

"Difficult to remove tailgate due to awkward camera connection. Temperature indicator gets shows incorrect reading at times"

Ted B., BC (2015 GMC Sierra 2500HD SLT 6.0-L V8)

"they are useless in bad weather"

Anonymous, CO (2015 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"No picture. Attempted to troubleshoot without success. Will be corrected at next routine service."

Anonymous, NV (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)
Display screen goes blank

"Several trips to the dealership and contact with GM Mother Ship resulted in software updaates, a replacement of the entire touch screen unit, and finally of the one cable that was at the root of the problem."

Anonymous, NJ (2015 GMC Sierra 2500HD SLE 6.0-L V8)
External music device interface (e.g., smart phone, MP3 player)

"screen will not display current title except for first song played when turned on"

Anonymous, AB (2015 GMC Sierra 2500HD Denali 6.0-L V8)

"My vehicle would not recognize my iPhone and Pandora (my music app) which several vehicles prior have before. The dealership fixed the problem but, i’m not sure it’s 100% sure it’s completely resolved."

Anonymous, RI (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)
In-dash navigation system (GPS)

"very hard to use and is off most of the time. Will send you down roads the do not exist. I use my phone"

Jim L., WY (2015 GMC Sierra 2500HD 6.0-L V8)

"Gps antenna needed replaced"

Anonymous, KS (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

"it is terrible, can not find most places, voice pairing is even worst"

Anonymous, CO (2015 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"Since the touch screen would periodically go black (roughly every two weeks), the GPS also didn't function. That was rectified when the touch screen was replaced and the cable connector was replaced as well."

Anonymous, NJ (2015 GMC Sierra 2500HD SLE 6.0-L V8)

"it sends you to the wrong places, will be hundreds of miles off, often wants you to go in the opposite direction. I live in Wyoming, I no which way north is"

James L., WY (2015 GMC Sierra 2500HD 6.0-L V8)
Voice control commands

"The voice command rarely understand or responds correctly to the command given. Sometime it is so wrong or far off that you wonder what language it really understands"

Bill F., TX (2015 GMC Sierra 2500HD SLE 6.0-L V8)

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

"huge leak around the rooftop factory installed antennae-unable to drive in rain as water actually runs in a stream"

Anonymous, ME (2015 GMC Sierra 2500HD SLE 6.0-L V8)

"water leaking into cab from around antennae on roof. Required repair on two separate occasions - at our cost."

Anonymous, BC (2015 GMC Sierra 2500HD Unsure 6.0-L V8)

"Repeated trips to dealer to fix roof leak through “shark fin” antenna"

Andy S., WA (2015 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"Water leak coming through the roof-mounted antenna. Have had the vehicle in for warranty repairs four times since I purchased it. The most recent repair was within the last 60 days. Remains to be seen if they got it fixed this time."

Glen B., OR (2015 GMC Sierra 2500HD SLE 6.0-L V8)
Seals and/or weather-stripping

"My truck spent the Dec 2015 in the shop trying to fix the leak into the cabin. The carpets were always wet. But the GPS antenna gasket must be installed very carefully. The antenna needed to be removed for some dent repair and it took the shop a few tries to get it in leak free. The antenna gasket was only one of leaking spots, there was another hole in the rear of the cab that also leaked."

Anonymous, WA (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)
Squeaks or rattles

"Rattles in the headliner. Required replacement of the headliner to correct"

Raymond A., WA (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)
Wind noise

"Wind noise in sun roof"

Anonymous, MI (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

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)

"The exhaust fluid tank was replaced because the tank heater failed"

Bill S., TX (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

"Diesel engine. At 82000 km warning light indicated poor quality DEF, vehicle speed will be reduced to 104 km/hr in 200 km. At the indicated 200 km engine reset and warning went away. All OK. Went to GM garage and was told of bad sensor or pump not under warranty, $600. repair cost. Google comments and other experienced mechanics advise that this is a can of worms. Diagnosis probably incomplete and the start of a series of problems with the system. Will deactivate system or get rid of truck."

Anonymous, NS (2015 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"DEF tank heater issue, covered under warranty, GM issue"

Anonymous, AZ (2015 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"heater in deisel injecter fluid take failed"

Anonymous, VT (2015 GMC Sierra 2500HD SLE 6.6-L V8 diesel)

"DEF system. Had to replace DEF tank and then one of the communication modules. This took 5 trips to the dealers to resolve."

Anonymous, FL (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)
Sensors (includes O2 or oxygen sensor)

"DEF temperature sensor failure."

Anonymous, FL (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

"Exhaust Sensor and DEF Tank Heater Unit"

Anonymous, AZ (2015 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

Body control module

"Had a water leak through the antenna, caused multiple wiring issues and shorted the BCM"

Anonymous, (2015 GMC Sierra 2500HD Unsure 6.0-L V8)
Exterior lights (other than headlights)

"Replaced turn signal bulbs with LED versions. System now experiences hyper fast blinking that can only be resolved by installing a resistor in the line of the light. Seems an oversight in the design"

Anonymous, TX (2015 GMC Sierra 2500HD SLE 6.0-L V8)
Headlights

"the 2015 2500HD has the worst headlights I've ever had. The projector lights give almost no light to the side of the car leaving sidewalks and ditches nearly dark and because of federal regulation more powerful bulbs are not available, lights were fixed for 2016 but GM has offered no fix for 2015. After market lights are between $500 and $800."

Anonymous, WA (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

"worst headlights ever. You have to be very careful after dark. Vision to the right is really bad. Sidewalks are totally in the dark. No one has ever even flashed their lights at me when I left the high beams on. GM has done very little to fix the problem but they changed the design for 2016."

Jim E., WA (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

Exhaust

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

What Owners Say

Exhaust leaks

"DEF tank replaced"

Anonymous, FL (2015 GMC Sierra 2500HD SLT 6.6-L V8 diesel)

"DEF tank was replaced"

Anonymous, FL (2015 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Exhaust manifold

"I was upset that although the truck was just over the 3 year mark for warranty it was way under the 36,000 mile mark, I felt like Gm should have covered some of it and the dealership said no!"

Alan B., NY (2015 GMC Sierra 2500HD SLT 6.0-L V8)
Other/unsure

"the system has stopped working and was not covered on the warranty."

Anonymous, PA (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

Brakes

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

What Owners Say

Premature brake wear

"The brakes started chattering, within two weeks it was taken in for repair. While repairing the brakes, they identified the leaking oil pan."

Anonymous, (2015 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Rotors

"Premature wear of rotors, distortions causing vibration. Rotors are undersized for this type of vehicle. GM Dealer did not offer any solution other than replacing all four at my sole cost. Went to BCAA and had the front rotors replaced with a heavy duty type. Rear rotors were O K."

Anonymous, BC (2015 GMC Sierra 2500HD SLT 6.0-L V8)

"Replaced front rotors and oil pan that was leaking at 25000 miles."

Anonymous, (2015 GMC Sierra 2500HD SLE 6.6-L V8 diesel)
Squeaking

"Squeal coming from right rear wheel upon takeoff and occasionally when stopping"

Lee T., MI (2015 GMC Sierra 2500HD Denali 6.0-L V8)

Engine Major

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

What Owners Say

Cylinder head

"had 28000 miles was past 3 yrs old cost me almost $900 no warranty was very upset"

Anonymous, NY (2015 GMC Sierra 2500HD SLT 6.0-L V8)
Head gasket

"I started getting a low coolant warning at about 1500 miles. I would check the coolant level and it was full. Continued for a couple of weeks. Brought it into dealership and they stated they had an internal document stating that they had a bad batch of head gaskets installed on some GMC diesel trucks. They checked the oil and found coolant in it. They kept the truck for just over a week while they replaced both head gaskets on the Duramax diesel engine. Very frustrating"

Michael K., AZ (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

"The cooling system was leaking in to the oil via the head gaskets. Per Chevrolet this was a known issue via internal bulletin. Overall they stated they received a bad batch of head gaskets and had to replace both."

Anonymous, AZ (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

Climate System

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

What Owners Say

A/C compressor

"pulley fell off"

Anonymous, MN (2015 GMC Sierra 2500HD SLT 6.6-L V8 diesel)
Automatic climate control

"The system does not cool adequately. Service did not resolve the problem. I did research and found many owners with the same problem."

Anonymous, FL (2015 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

Locks and latches

"Drivers side rear door lock does only functions unless manually operated. The lock does not function using the remote control or by using the lock "switch" located in the driver's control panel. This presents a possible safety concern as the vehicle cannot be easily secured or opened up."

Anonymous, OK (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)
Mirrors

"Both electric towing mirrors fail to fold down in freezing weather. One mirror was replace but started to experience the same issue."

Anonymous, OK (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

Engine Minor

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

What Owners Say

Oil leaks

"The oil pan gasket was leaking"

Gary M., CA (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

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

Steering wheel vibration

"Out of the blue the truck started getting a vibration at around 70 mph no matter what type of surface I drove on. The vibration was so bad that the passenger seat, when empty, would shack violently. Also the truck started pulling to the right. If you let go of the steering wheel while on the highway it would automatically change lanes to th right pretty fast. Dealership never figured it out. They would just state that the truck is within alignment specs. My friend bought the exact same make/mo"

Michael K., AZ (2015 GMC Sierra 2500HD Denali 6.6-L V8 diesel)

Paint/Trim

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

What Owners Say

Paint (fading, chalking, cracking, or peeling)

"paint chipping around the windows down to primer no warranty bull crap!"

Anonymous, NY (2015 GMC Sierra 2500HD SLT 6.0-L V8)

Engine Cooling

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

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

Transmission Minor

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

Drive System

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

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