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 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Vehicle Speed Sensor: Locations
Inside the Transmission Components (M30)
36 - Vehicle Speed Sensor (VSS)
66 - Torque Converter Clutch (TCC) Solenoid Valve
69 - Automatic Transmission Fluid Pressure Manual Valve Position Switch
367a - 1-2 Shift Solenoid (SS) Valve
367b - 2-3 Shift Solenoid (SS) Valve
377 - Pressure Control (PC) Solenoid Valve
394 - 3-2 Shift Solenoid (SS) Valve
396 - Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) Solenoid Valve
Rear of the Transmission and Transfer Case Components (M30)
Engine Harness - Rear (M30):
1 - Transmission
2 - X175
3 - Heated Oxygen Sensor (HO2S) 2 Connector (LLR)
4 - Transfer Case Encoder Motor Connector
5 - Vehicle Speed Sensor (VSS) Connector
6 - Park/Neutral Position (PNP) Switch
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.
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