What are the most common GMC Terrain problems?
According to Au7o's analysis of 2,270+ owner reports, the 2015 GMC Terrain has 11 documented issues. The most frequently reported are: 2.4L I4 Excessive Oil Consumption and Piston Ring Failure, High Feature V6 (3.0L LF1 / 3.6L LFX) Timing Chain Stretch - P0008 / P0009 Cam-Crank Correlation, 6T40/6T45 6-Speed Transmission Shudder and Harsh Shifts. Of these, 2 are rated critical and should be addressed promptly.
Is the GMC Terrain reliable?
The 2015 GMC Terrain has 11 known issues documented across 2,270+ owner reports. 2 issues are rated critical: 2.4L I4 Excessive Oil Consumption and Piston Ring Failure and High Feature V6 (3.0L LF1 / 3.6L LFX) Timing Chain Stretch - P0008 / P0009 Cam-Crank Correlation. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common GMC Terrain problems?
Repair costs for known GMC Terrain issues range from $0 to $6,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 2.4L I4 Excessive Oil Consumption and Piston Ring Failure, typically costs $1,200-$6,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2010-2017 GMC Terrain 2.4L I4 Excessive Oil Consumption and Piston Ring Failure?
The 2.4L LEA and LE9 four-cylinder engines in 2010-2017 Terrain are among the most reported excessive oil consumption issues in GM's lineup. Many owners consume 1 quart of oil every 1,000-2,000 miles. The root cause is inadequate piston ring tension combined with piston ring land… Repairs typically run $1,200-$6,500. Severity: high.
What is the 2010-2017 GMC Terrain High Feature V6 (3.0L LF1 / 3.6L LFX) Timing Chain Stretch - P0008 / P0009 Cam-Crank Correlation?
First-generation Terrains ordered with the optional V6 - the 3.0L LF1 in 2010-2012 and the 3.6L LFX from 2013-2017 - use GM's High Feature V6 architecture with four timing chains. The chains and their tensioners/guides stretch and wear prematurely, particularly on engines run on… Repairs typically run $1,800-$4,000. Severity: high.
What is the 2010-2017 GMC Terrain 6T40/6T45 6-Speed Transmission Shudder and Harsh Shifts?
The 2010-2017 Terrain uses the GM 6T40 (2.4L) and 6T45 (V6) 6-speed automatic transmissions, both of which suffer from torque converter shudder, harsh shifts, and solenoid failures. The shudder occurs at light throttle between 30-50 mph when the torque converter clutch locks up. Repairs typically run $150-$2,800. Severity: medium.
What is the 2010-2017 GMC Terrain Water Pump Failure and Coolant Leak?
The engine-driven water pump develops bearing/impeller wear or seal leaks, allowing coolant to weep (often visible as dried Dex-Cool on the timing-chain cover or flung from the pump pulley) and eventually causing overheating. On both the 2.4L Ecotec and 3.6L V6, the pump is timin… Repairs typically run $1,008-$1,443. Severity: medium.
What is the 2010-2017 GMC Terrain Throttle Body / Throttle Position Sensor Failure - 'Reduced Engine Power' Warning?
First-generation Terrains (2010-2017) are prone to a sudden 'Reduced Engine Power' warning caused by a failing electronic throttle body. Carbon and grime build up inside the bore and the internal throttle position sensor (TPS) fails or reads erratically, causing the ECM to enter… Repairs typically run $250-$650. Severity: medium.
What is the 2010-2017 GMC Terrain Headlight Housing Veiling Glare - FMVSS 108 Noncompliance Recall (22V137)?
GM recalled 740,581 first-generation Terrains because an internal reflection in the headlamp housing throws excessively bright light above the beam pattern and outside the driver's own field of view. The vehicles do not comply with Federal Motor Vehicle Safety Standard 108. The s… Repairs typically run $0-$0. Severity: medium.
What is the 2010-2024 GMC Terrain Wheel Bearing / Hub Assembly Magnetic Encoder Ring Failure - ABS and Traction Lights Without Bearing Noise?
Terrain front and rear hub assemblies integrate the ABS magnetic encoder ring into the bearing's inboard seal, where it sits directly exposed to road salt and moisture. Two distinct failure modes result. The mechanical one is the familiar humming or roaring that rises with speed… Repairs typically run $300-$800. Severity: medium.
What is the 2010-2017 GMC Terrain Sunroof Drain Hose Clogging and Disconnection - Water on the Cabin Floor and Headliner Staining?
Sunroof-equipped first-generation Terrains use a drain trough around the glass panel with four hoses routed down the A-pillars and out through the rear body-side extensions. The original-design hoses are small in diameter and prone to clogging with debris and factory sealant resi… Repairs typically run $100-$800. Severity: medium.
What is the 2013-2019 GMC Terrain IntelliLink Infotainment Freezing/Rebooting and Backup Camera Black Screen?
The IntelliLink/MyLink touchscreen freezes and spontaneously reboots, losing control of radio, climate, navigation and Bluetooth, and often displays a black screen or a frozen backup-camera image. During a reboot, phone calls drop and the rear camera can go dark while in reverse… Repairs typically run $100-$900. Severity: low.
What is the 2010-2017 GMC Terrain HVAC Blend Door Actuator Failure (Clicking Noise, No Temperature Control)?
The HVAC blend/mode-door actuators fail as their internal plastic gears strip, producing a repetitive clicking or knocking sound from behind the dash and causing loss of temperature or airflow control. On dual-zone systems one side commonly blows hot while the other blows cold, o… Repairs typically run $150-$450. Severity: low.
What is the 2010-2017 GMC Terrain Fuel Level Sender Card Fouling - Gauge Sticks, Reads Low or Never Reaches Full?
The fuel level sensor in the in-tank pump module is a potentiometer whose wiper rides on a resistor card. Sulfur compounds in pump gasoline plate onto the card, and varnish builds on the float arm pivot, so the sender's resistance no longer tracks actual tank level. First-generat… Repairs typically run $350-$900. Severity: low.
