The 2024 GMC Terrain rides on GM's third-gen platform with turbocharged four-cylinders, but it's too new for pattern failures — we're seeing isolated catastrophic engine problems on certain units that suggest manufacturing defects rather than design flaws. The transmission cooler and drivetrain mount issues are carryovers from prior gen.
Symptoms: Sudden knocking or rattling from engine bay under load, Metal shavings in oil during early oil changes, Check engine light with misfire codes (P0300-series), Complete loss of power or engine seizure
Fix: Short block replacement or complete engine swap under warranty; outside warranty this is 18-24 labor hours plus engine assembly. These are isolated build-quality issues — bad bearing clearances, defective pistons, or oil starvation from assembly debris — not wear items.
Estimated cost: $8,000-12,000
Transmission Oil Cooler Line Leaks
Occasional · medium severity
Typical onset: 40,000-70,000 mi
Symptoms: Red ATF puddles under vehicle near radiator area, Transmission overheating warnings on dash, Burnt transmission fluid smell, Harsh or delayed shifts when fluid is low
Fix: Replace cooler lines and fittings where they connect to radiator/transmission; 2.5-3.5 hours labor. Often the quick-connect fittings crack from heat cycling. Catch it early before transmission damage occurs.
Estimated cost: $400-700
Transmission Mount Failure (Torque Strut)
Occasional · low severity
Typical onset: 50,000-80,000 mi
Symptoms: Clunking when shifting from park to drive or reverse, Excessive engine movement visible from engine bay during acceleration, Vibration through cabin at idle, Drivetrain 'rocking' sensation during throttle tip-in
Fix: Replace upper transmission mount (torque strut); 1.5-2 hours labor. The hydraulic damping fails and the rubber tears. Simple job but ignore it and you'll accelerate wear on CV axles and other mounts.
Estimated cost: $250-450
Fuel Filter Clogging (Particulate Issues)
Occasional · medium severity
Symptoms: Rough idle and hesitation under acceleration, Engine stumbling or cutting out at highway speeds, Hard starting after sitting overnight, P0087 code (fuel rail pressure too low)
Fix: Replace in-tank fuel pump module with filter; 2-3 hours labor because tank often needs dropping. We're seeing contaminated fuel or manufacturing debris in tanks on some early '24s. Not a design issue but a quality control slip.
Estimated cost: $500-900
Head Gasket Weeping (1.5L Turbo)
Rare · medium severity
Typical onset: 20,000-50,000 mi
Symptoms: White residue around head/block mating surface, Slow coolant loss without visible external leaks, Sweet smell from engine bay after heat cycling, No overheating or performance loss initially
Fix: Head gasket replacement; 8-10 hours labor including resurfacing. We've seen a handful where torque specs weren't met during assembly or gasket material is defective. Catch it early before coolant gets into oil or combustion chambers.
Estimated cost: $1,800-2,800
Owner tips
Check oil level religiously every 1,000 miles during first 30,000 miles — early bearing failures show up as consumption or metallic oil first
Inspect undercarriage for ATF leaks at every oil change, especially around cooler lines at radiator
Use Top Tier fuel exclusively — the direct-injection turbos are sensitive to carbon buildup and fuel quality
Extended warranty is worth considering on this model year given the scattered but catastrophic engine failures under 30k miles
Skip the 2024 model year entirely — let early adopters work out the quality control gremlins; by 2025-26 these assembly issues should be resolved, but right now you're gambling on whether your unit came off the line on a good day.
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: AGM battery required for start-stop system
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Every control module on the 2018-2024 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.
📍 9-speed automatic: integrated with valve body inside transmission (TEHCM - Transmission Electro-Hydraulic Control Module)
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ Requires transmission pan removal, fluid drain, and valve body disassembly. VIN programming, adaptive relearn, and security gateway authentication required. 9-speed transmission standard across all models.
Body Control Module (BCM)2.8 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Behind center of instrument panel, above center console, mounted to HVAC plenum bracket
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ Requires instrument panel top cover removal. VIN programming, theft deterrent relearn, security gateway authentication, and security linking with ECM/SDM required. All power accessories and options must be reconfigured. Critical security module.
Electric Power Steering Control Module (EPSCM)2.2 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Integrated with electric power steering motor assembly on steering column, below instrument panel
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ Steering column must be partially disassembled. VIN programming, steering angle sensor calibration, and security gateway authentication required after replacement.
📍 Behind center of instrument panel, near BCM, mounted to HVAC plenum
🔧 GM SPS via GDS2/MDI or MDI 2 with security access
⚠️ VIN programming and security gateway authentication required. Controls security access to all modules on vehicle network. Critical security module. Replacement requires dealer-level tools in most cases.
📍 Behind center of instrument panel, near radio, mounted to HVAC plenum
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ Camera calibration and dynamic guidelines configuration required. Processes feeds from four cameras (front, rear, both mirrors). Rear camera standard on all models; surround vision optional.
OnStar Communication Module / Vehicle Communication Interface Module (VCIM)1.8 hr R&Rsecurity gateway +0.6 hr▸ programming details
📍 Behind center stack, above radio assembly, mounted to HVAC plenum
🔧 GM SPS via GDS2/MDI or MDI 2 with security access
⚠️ VIN programming, security gateway authentication, and OnStar account linking required. Security-critical module. 4G LTE Wi-Fi hotspot capability. Aftermarket tools have very limited success.
Remote Control Door Lock Receiver (RCDLR)1.8 hr R&Rsecurity gateway +0.5 hr▸ programming details
📍 Behind center of instrument panel, near BCM, mounted to HVAC plenum
🔧 GM SPS via GDS2/MDI or MDI 2 with security access
⚠️ VIN programming and security gateway authentication required. Handles remote keyless entry, remote start, and push-button start signals. Security-linked with BCM and gateway. Aftermarket tools have limited success.
Fuel Pump Control Module (FPCM)1.8 hr R&Rno coding▸ programming details
📍 Under vehicle, mounted to fuel tank top, integrated with fuel pump assembly
⚠️ Fuel tank must be lowered. Fuel system depressurization required. Module controls variable fuel pump speed based on ECM commands.
📍 Engine compartment, driver side frame rail near strut tower, integrated with ABS hydraulic unit
🔧 GDS2/MDI or Autel/Launch
⚠️ Brake system bleeding required. Automated bleed procedure via scan tool recommended. StabiliTrak, traction control, and hill start assist integrated. Electronic parking brake control on some models.
📍 Behind left side of instrument panel, near BCM location
🔧 GDS2/MDI or Autel/Launch
⚠️ Trailer brake gain calibration required. Integrates with EBCM for coordinated braking. Trailer sway control and trailer tire pressure monitoring on some models.
Forward Collision Alert / Adaptive Cruise Control Module (FCA/ACC)1.5 hr R&Rdealer / factory tool +0.8 hrwith Forward Collision Alert or Adaptive Cruise Control (SLT/Denali trims)▸ programming details
📍 Behind front grille, center, mounted to radiator support
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ Radar calibration and aiming required after replacement. Requires specific alignment equipment. Controls forward collision alert, automatic emergency braking, adaptive cruise control, and following distance indicator. Lane keep assist uses camera in mirror.
📍 Engine compartment, driver side firewall, mounted to bracket below brake master cylinder
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ VIN programming, theft deterrent relearn, and security gateway authentication required. 1.5L turbo and 2.0L turbo engines use different ECM hardware.
Infotainment Control Module / Radio (ICM)1.2 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Behind center stack, integrated with touchscreen display assembly
🔧 GM SPS via GDS2/MDI or MDI 2
⚠️ VIN programming and security gateway authentication required. 7-inch or 8-inch touchscreen depending on trim. Apple CarPlay and Android Auto standard. OnStar and navigation features require activation.
Liftgate Control Module (LGM)1.2 hr R&Raftermarket tool +0.3 hrwith power liftgate▸ programming details
📍 Inside liftgate, driver side, behind interior trim panel
🔧 GDS2/MDI or Autel/Launch
⚠️ Liftgate position relearn and height programming required after replacement. Hands-free operation standard on most trims with power liftgate.
📍 Center console, below center stack, mounted to floor tunnel
🔧 GM SPS via GDS2/MDI or MDI 2 with security access
⚠️ VIN programming and security gateway authentication required. Security-linked with BCM. Crash data retrieval capability. Wait 2 minutes after battery disconnect before handling. Aftermarket tools have limited success.
Parking Assist Control Module (PACM)1.0 hr R&Raftermarket tool +0.3 hrwith front/rear park assist▸ programming details
📍 Behind rear bumper fascia, center, mounted to bumper reinforcement
🔧 GDS2/MDI or Autel/Launch
⚠️ Sensor calibration required after replacement. Front and rear park assist standard on most trims. Integrates with surround vision on equipped models.
Door Control Module (DCM)1.0 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Inside each front door, lower section, behind door trim panel
🔧 GDS2/MDI or Autel/Launch
⚠️ Window auto-up/down calibration required. One module per front door. Memory seat functions may require additional programming.
⚠️ VIN programming and security gateway authentication required. Mileage transfer from old module required by law. Digital cluster on higher trims. Theft deterrent relearn may be needed.
Headlamp Control Module (HCM)0.8 hr R&Raftermarket tool +0.2 hrwith LED or HID headlamps▸ programming details
📍 Engine compartment, behind driver side headlamp assembly
🔧 GDS2/MDI or Autel/Launch
⚠️ Headlamp aim calibration may be required. Controls adaptive lighting functions on equipped models. Standard halogen headlamps do not use this module.
⚠️ Seat position calibration required. Integrates with driver door module for memory recall. Heated and ventilated seat functions integrated.
Tire Pressure Monitor Control Module (TPMS)no coding▸ programming details
📍 Function integrated into BCM; no separate module
⚠️ TPMS sensor programming handled by BCM. Sensor relearn required after tire rotation or replacement.
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 2024 Chevrolet Blazer, Blazer EV, Equinox, and GMC Terrain vehicles. The door strikers may fracture, resulting in the door opening unexpectedly.
Consequence: A door opening while the vehicle is being driven can increasing the risk of injury or a crash.
Remedy: Dealers will replace all four door strikers and attaching bolts, free of charge. Owner notification letters were mailed January 24, 2024. 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 N232429911.
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 2024 GMC Terrain 2.0L I4 Turbo and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.