The 2014 GMC Terrain suffers from catastrophic engine timing chain failures on the 2.4L Ecotec and transmission fluid cooler leaks that contaminate the 6-speed automatic. These are expensive, often total-loss issues that hit well before 100k miles.
2.4L Ecotec Timing Chain Stretch and Failure
Common · high severity
Typical onset: 70,000-120,000 mi
Symptoms: Rattling noise on cold start that lasts 5-15 seconds, Check engine light with P0008, P0011, P0014 (cam/crank correlation codes), Sudden loss of power or complete engine failure if chain breaks, Metal shavings in oil
Fix: Timing chain, guides, tensioner, and sprockets replacement requires 8-12 hours labor. Often discovers piston/bearing damage from debris once opened, turning into full short block or engine replacement at 20-30 hours. This engine has insufficient oil pressure to the chain tensioner.
Symptoms: Slipping, delayed engagement, or no movement in gear, Milky pink transmission fluid (coolant contamination), Transmission overheating warnings, Engine overheating from ATF in coolant side
Fix: Built-in cooler inside radiator fails, mixing coolant and ATF. Requires radiator, transmission rebuild or replacement, complete fluid flush of both systems. 12-18 hours labor. Many shops recommend proactive external cooler bypass at 60k to prevent this.
Estimated cost: $4,000-6,500
3.6L V6 Timing Chain and Bearing Failure
Occasional · high severity
Typical onset: 90,000-140,000 mi
Symptoms: Rattling from engine on cold start, P0016, P0017, P0018, P0019 timing codes, Low oil pressure warning, Metal flakes on oil dipstick
Fix: V6 has four timing chains (two primary, two secondary). Stretch leads to timing issues and bearing damage. Chains alone are 14-18 hours, but often finds spun bearings requiring short block at 25+ hours. Less common than 2.4L failure but still a known weak point.
Estimated cost: $3,500-9,000
Transmission Mount Failure
Common · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Loud clunk when shifting from Park to Drive or Reverse, Vibration at idle, especially in Drive, Excessive engine movement visible when accelerating
Fix: Upper transmission mount (torque strut) fails from fatigue. Replacement is straightforward at 1.5-2 hours but requires supporting powertrain. Often replaced alongside lower engine mount.
Estimated cost: $250-450
HVAC Actuator Failure (Multiple Locations)
Occasional · low severity
Typical onset: 70,000-110,000 mi
Symptoms: Clicking or ticking noise from behind dashboard, Heat/AC stuck on one side or wrong temperature, Mode door won't switch (defrost, floor, vents), Continuous clicking even with ignition off, draining battery
Fix: Plastic blend door actuators fail frequently. Location varies (driver/passenger temp, mode door). Dash access required for some positions. 1-3 hours labor depending on which one fails.
Estimated cost: $200-600
Water Pump Failure (2.4L)
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Coolant leak from front of engine, Squealing or grinding noise from water pump pulley, Engine overheating, Coolant dripping onto starter area
Fix: Water pump is timing chain driven on 2.4L, so failure often coincides with chain issues. If done alone, 4-6 hours because front cover must be removed. Smart to do timing components at same time if near failure mileage.
Estimated cost: $800-1,400
PCV System and Oil Consumption (2.4L)
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Excessive oil consumption (1 qt per 1,000-2,000 miles), Rough idle or check engine light P0171 (lean code), Oil in intake manifold and throttle body, Valve cover leaking oil
Fix: PCV passages in valve cover clog, causing pressure buildup that forces oil past rings or through intake. Valve cover replacement with updated design at 3-4 hours labor. GM had TSB 10-06-01-008L addressing this. Does not fix worn rings if already damaged.
Estimated cost: $600-1,000
Owner tips
Install external transmission cooler immediately on any 2.4L/6T70 combo to bypass the internal radiator cooler — this is cheap insurance against $5k transmission contamination
Use full synthetic 5W-30 (Dexos1 approved) and change every 5,000 miles maximum on 2.4L engines to slow timing chain stretch
Listen for ANY cold-start rattle on test drive — if present, budget for imminent timing chain work or walk away
Check transmission fluid color (should be red, not milky or brown) and coolant (shouldn't smell like ATF or have oily film)
Budget $1,000/year for engine-related repairs after 80k miles if keeping the 2.4L long-term
Hard pass on the 2.4L unless under 60k miles with full records and external trans cooler already installed; 3.6L V6 is less catastrophic but still risky after 90k — neither engine is known for longevity in this chassis.
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: Group 48 (H6) required for 2.4L I4 engine; 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.
Performance
Horsepower
182hp
Torque
172lb-ft
0–60 mph
9.8sec
Quarter mile
17.4sec
Top speed
112mph
Capability & size
Towing capacity
1,500lb
Payload
1,100lb
Curb weight
3,990lb
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 2014 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.