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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Manual Transmission - TREMEC 6-Speed (M3L Mg9)) >> Diagnostic Information and Procedures >> DTC P18C4 or P18C5: Gear Position Sensor >> Reference Information

Reference Information

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Schematic Reference

Manual Transmission Schematics (M3L) Manual Transmission Schematics (MG9) 

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Manual Transmission Description and Operation (M3L) Manual Transmission Description and Operation (MG9) 

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

K20 Engine Control Module: Scan Tool Information (LCV, LFX or LTG)

Special Tools

J-38522-A  Vehicle Signal Generator

For equivalent regional tools, refer to Special Tools .