Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 GMC Terrain FWD L4-2.4LFACTORY OEM SERVICE PROCEDURE
Left Front Engine Components
Powertrain Component Views
Left Rear Engine Components (LEA)
1 - T8D Ignition Coil 4
2 - T8C Ignition Coil 3
3 - T8B Ignition Coil 2
4 - T8A Ignition Coil 1
5 - Q6F Camshaft Position Actuator Solenoid Valve - Intake
6 - Q6E Camshaft Position Actuator Solenoid Valve - Exhaust
7 - B52A Heated Oxygen Sensor 1
8 - B52B Heated Oxygen Sensor 2
9 - B34 Engine Coolant Temperature Sensor
10 - B23E Camshaft Position Sensor - Exhaust
11 - Q12 Evaporative Emission Purge Solenoid Valve
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.