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.
2008 Pontiac Grand Prix V6-3.8LFACTORY OEM SERVICE PROCEDURE
Control Module: Locations
Automatic Transmission Electronic Component Views
Internal Electronic Component Locations
Internal Electronic Component Location:
10 - Vehicle Speed Sensor (VSS) Assembly
315a - 1-2, 3-4 Shift Solenoid (SS) Valve Assembly
315b - 2-3 Shift Solenoid (SS) Valve Assembly
322 - Pressure Control (PC) Solenoid Valve Assembly
334 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Assembly
391 - Transmission Fluid Temperature (TFT) Sensor
395 - Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly
440 - Automatic Transmission Input Shaft Speed (A/T ISS) Sensor Assembly
811 - Lever Assembly-Manual Shaft Detent with Shift Position Switch - Internal Mode Switch (IMS)
Engine Compartment-LF (3.8L)
Transmission Control Module:
1 - Transmission Control Module (TCM)
Transmission Control Module (TCM)
1 - Transmission Control Module
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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