2008 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE

Transmission Position Sensor/Switch: Locations



Rear of the Transmission and Transfer Case Components (MA5)

Engine Harness - Rear (MA5):

Factory service manual diagram



1 - Transmission
2 - Backup Lamp Switch
3 - Heated Oxygen Sensor (HO2S) 2 Connector (LLR)
4 - Transfer Case Encoder Motor Connector
5 - Vehicle Speed Sensor (VSS) Connector



Engine - Left (LH8)

Factory service manual diagram



1 - Engine Coolant Temperature (ECT) Sensor
2 - Generator
3 - Ignition Coil 1
4 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve
5 - Ignition Coil 3
6 - Ignition Coil 5
7 - Ignition Coil 7
8 - Engine Oil Pressure (EOP) Sensor
9 - Park/Neutral Position (PNP) Switch (M30)
10 - Knock Sensor (KS) 1
11 - Engine Block Heater Connector (K05)

Left Side of the Transmission Components (M30)

Park Neutral Position (PNP) Switch:

Factory service manual diagram



1 - Automatic Transmission
2 - Park/Neutral Position (PNP) Switch

Rear of the Transmission and Transfer Case Components (M30)

Engine Harness - Rear (M30):

Factory service manual diagram



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.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.