The 2015 GMC Terrain shares the Theta platform with the Equinox and suffers from catastrophic engine failures on the 2.4L I4 (oil consumption leading to spun bearings), problematic 6T70 transmission oil coolers, and chronic timing chain stretch. The 3.6L V6 is significantly more reliable but still deals with timing chain issues at higher mileage.
2.4L I4 Catastrophic Oil Consumption and Bearing Failure
Common · high severity
Typical onset: 70,000-120,000 mi
Symptoms: Excessive oil consumption requiring 1+ quarts between changes, Blue smoke from exhaust on cold start or acceleration, Sudden engine knock, loss of oil pressure, check engine light, Complete engine seizure if oil starvation occurs
Fix: Piston ring design allows carbon buildup causing oil burning that starves bearings. Once knocking starts, requires complete engine replacement or short block with all bearings, pistons, and rings. 18-24 labor hours for engine replacement.
Estimated cost: $4,500-7,500
6T70 Transmission Internal Oil Cooler Failure
Common · high severity
Typical onset: 60,000-110,000 mi
Symptoms: Coolant in transmission fluid or transmission fluid in coolant, Strawberry milkshake appearance in coolant reservoir, Transmission slipping, delayed engagement, or complete failure, Overheating transmission or engine
Fix: Internal cooler in radiator fails, cross-contaminating fluids and destroying transmission. Requires radiator replacement, transmission flush or rebuild, and all cooling system lines flushed. External cooler highly recommended. 12-20 hours if transmission needs rebuild.
Estimated cost: $2,500-5,500
Timing Chain Stretch (Both Engines)
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Cold-start rattle for 2-5 seconds that worsens over time, Check engine light with P0016, P0017, P0011, P0021 codes, Rough idle, poor performance, or hard starting, Metallic rattling from front of engine
Fix: Chain stretches due to inadequate tensioner design and oil quality issues. Requires timing chain set, guides, tensioners, VVT solenoids, and cam phasers. 2.4L takes 8-12 hours, 3.6L takes 10-14 hours. Neglect leads to jumped timing and valve damage.
Estimated cost: $1,800-3,200
Transmission Mount Failure
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Severe clunk when shifting from park to drive or reverse, Vibration at idle in gear that disappears in neutral, Visible sagging or torn rubber on passenger-side mount, Excessive engine movement visible under acceleration
Fix: Hydraulic passenger-side mount deteriorates from heat and stress. Requires mount replacement and often involves supporting engine/transmission to access. 2-3 labor hours.
Estimated cost: $350-650
Power Steering Assist Failure
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Intermittent loss of power steering, especially in cold weather, Service power steering message on dash, Heavy steering effort that comes and goes, No warning before assist drops out
Fix: Electric power steering motor or control module fails. Requires diagnosis to determine if motor, rack assembly, or ECU is faulty. Steering remains functional but requires significant effort. 3-5 hours for motor replacement.
Estimated cost: $800-1,600
Windshield Wiper Motor Failure (Recall 15V-498)
Occasional · medium severity
Symptoms: Wipers stop working intermittently or completely, Wipers operate only on high speed, Burning smell from wiper area or smoke, Wiper motor continues running with wipers off
Fix: Ball joints in wiper motor mechanism can corrode causing motor overload and potential fire risk. Covered under recall 15V-498. Dealer replaces wiper motor module. 1.5-2 hours if paying out of pocket post-recall expiration.
Estimated cost: $250-450
A/C Condenser Corrosion and Refrigerant Leaks
Occasional · low severity
Typical onset: 70,000-120,000 mi
Symptoms: A/C blows warm intermittently then stops cooling entirely, Visible corrosion or green residue on condenser fins, Low refrigerant indicated by manifold gauges, A/C compressor cycles rapidly or not at all
Fix: Condenser mounted ahead of radiator corrodes from road salt and debris. Requires condenser replacement, evacuation, recharge, and leak check. 3-4 hours labor.
Estimated cost: $600-1,000
Owner tips
If buying a 2.4L I4 model, verify detailed oil consumption records and inspect for blue smoke—walk away if consumption exceeds 1 quart per 2,000 miles
Change oil every 5,000 miles maximum with quality synthetic (0W-20 for 2.4L, 5W-30 for 3.6L) to minimize timing chain wear
Check coolant reservoir for milkshake appearance and transmission fluid color monthly—catching cooler failure early saves the transmission
Install external transmission cooler if towing or operating in hot climates to extend 6T70 life
Address timing chain rattle immediately—waiting until codes appear often means valve damage has occurred
The 3.6L V6 models are significantly more reliable; worth seeking out over 2.4L I4 versions
Avoid the 2.4L I4 at all costs due to catastrophic engine failure risk; a 3.6L V6 with documented timing chain service and no trans cooler contamination can be acceptable under $10k, but budget $2-3k for deferred maintenance.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: H6 group also fits; battery located under hood
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Every control module on the 2010-2017 GMC Terrain — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 6T70 6-speed automatic: integrated with valve body inside transmission (TEHCM - Transmission Electro-Hydraulic Control Module)
🔧 GM SPS via Tech 2 (2010-2013) or GDS2/MDI (2014-2017)
⚠️ Requires transmission pan removal, fluid drain, and valve body disassembly. VIN programming and adaptive relearn required.
Body Control Module (BCM)2.8 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Behind center of instrument panel, above center console, mounted to HVAC plenum bracket
🔧 GM SPS via Tech 2 (2010-2013) or GDS2/MDI (2014-2017)
⚠️ Requires instrument panel top cover removal. VIN programming, theft deterrent relearn, and security linking with ECM/SDM required. All power accessories and options must be reconfigured.
Electric Power Steering Control Module (EPSCM)2.2 hr R&Rdealer / factory tool +0.4 hr▸ programming details
📍 Integrated with electric power steering motor assembly on steering column, below instrument panel
🔧 GM SPS via Tech 2 (2010-2013) or GDS2/MDI (2014-2017)
⚠️ Steering column must be partially disassembled. VIN programming and steering angle sensor calibration required after replacement.
OnStar Communication Module / Vehicle Communication Interface Module (VCIM)1.8 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Behind center stack, above radio assembly, mounted to HVAC plenum
📍 Engine compartment, driver side firewall, mounted to bracket below brake master cylinder
🔧 GM SPS via Tech 2 (2010-2013) or GDS2/MDI (2014-2017)
⚠️ VIN programming and theft deterrent relearn required. 2016-2017 models have enhanced security protocols.
Radio / Infotainment Control Module (RCM/ICM)1.2 hr R&Rdealer / factory tool +0.4 hr▸ programming details
📍 Behind center stack, integrated with touchscreen display assembly
🔧 GM SPS via Tech 2 (2010-2013) or GDS2/MDI (2014-2017)
⚠️ VIN programming and theft deterrent relearn required. OnStar and navigation features require activation. 2010-2012 use different hardware than 2013-2017.
Liftgate Control Module (LGM)1.2 hr R&Rrelearn only +0.3 hrwith power liftgate▸ programming details
📍 Inside liftgate, driver side, behind interior trim panel
🔧 Tech 2 or aftermarket scan tool
⚠️ Liftgate position relearn and height programming required after replacement. Hands-free operation on some models.
📍 Function integrated into BCM; no separate module
⚠️ Theft deterrent functions handled by BCM. Key fob programming via BCM. Remote start available on some trims.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
General Motors, LLC (GM) is recalling certain 2014-2015 Chevrolet Equinox and GMC Terrain vehicles. The ball joints in the windshield wiper module may corrode, causing one or both windshield wipers to fail.
Consequence: Inoperative windshield wipers can reduce visibility in certain driving conditions, increasing the risk of a crash.
Remedy: Dealers will inspect the wiper module, and repair or replace it as necessary, free of charge. Interim owner notification letters informing owners of the safety risk were mailed on April 21, 2022. Owner notification letters were mailed on October 25, 2022. Owners may contact Chevrolet customer service at 1-800-222-1020 and GMC customer service at 1-800-462-8782. GM's number for this recall is N212352530.
EXTERIOR LIGHTING:HEADLIGHTS · 22V137000
2022-03-08
General Motors, LLC (GM) is recalling certain 2010-2017 GMC Terrain vehicles. A reflection caused by the headlight housings may illuminate areas above the vehicle and outside of the driver's view with excessively bright light. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
Consequence: The bright reflection may cause a glare for other drivers, reducing their visibility and increasing the risk of a crash.
Remedy: Dealers will install headlamp appliques, free of charge. Owner notification letters were mailed September 8, 2022. Owners may contact GMC customer service at 1-800-462-8782. GM's number for this recall is N222363740.
AIR BAGS:SIDE/WINDOW · 15V666000
2015-10-16
General Motors LLC (GM) is recalling certain model year 2015 Buick LaCrosse, Cadillac XTS, Chevrolet Camaro, Equinox, Malibu, and GMC Terrain vehicles. The affected vehicles have front seat-mounted side impact air bags whose inflator may rupture upon its deployment.
Consequence: In the event of a crash necessitating deployment of one or both of the side impact air bags, the air bag's inflator may rupture and the air bag may not properly inflate. The rupture could cause metal fragments to strike the vehicle occupants, potentially resulting in serious injury or death. Additionally, if the air bag does not properly inflate, the driver or passenger is at an increased risk of injury.
Remedy: GM will notify owners, and dealers will replace the side impact air bag modules, free of charge. The recall began on October 19, 2015. Owners may contact Buick customer service at 1-800-521-7300, Chevrolet customer service at 1-800-222-1020, Cadillac customer service at 1-800-458-8006, or GMC customer service at 1-800-462-8782. GM's number for this recall is 01320.
Performance
Horsepower
182hp
Torque
172lb-ft
0–60 mph
9.8sec
Quarter mile
17.3sec
Top speed
112mph
Fuel economy (EPA)
City
22mpg
Highway
31mpg
Combined
26mpg
Fuel
Regular Gasoline
Capability & size
Towing capacity
1,500lb
Payload
1,175lb
Curb weight
3,871lb
EPA class
Small Sport Utility Vehicle 2WD
Wiper blades
First generation (2010-2017). Standard J-hook attachment on front wipers, rear is also hook-type.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2015 GMC Terrain 2.4L I4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.