GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0775: Low Tire Pressure System Sensors Not Learned

Circuit/System Description

The remote control door lock receiver (RCDLR) receives a radio frequency (RF) transmission from each tire pressure sensor. Each sensor RF transmission contains its own unique identification (ID) code that must be learned into the RCDLR memory. Once all 4 IDs have been learned and vehicle speed is 25 mph or greater, the RCDLR continuously compares IDs in received transmission to its learned IDs to determine if all 4 sensors are present.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The RCDLR has not undergone the tire pressure sensor learn procedure.

Action Taken When the DTC Sets

The driver information center (DIC) displays the SERVICE TIRE MONITOR warning message.

Conditions for Clearing the DTC

A current DTC will clear when the RCDLR has undergone the sensor learn procedure.

Diagnostic Aids

A newly replaced RCDLR will set DTC C0775 on its initial ignition ON cycle. Tire pressure sensor learn procedure must be performed.

Reference Information

Description and Operation

Tire Pressure Monitor Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs
    •  Connector Repairs

Scan Tool Reference

    •  Scan Tool Data Definitions
    •  Scan Tool Data List

Special Tools Required

J-46079 Tire Pressure Monitor Diagnostic Tool

Circuit/System Verification

Verify that the DTC C0775 is not set.

If the DTC is set, program/setup the RCDLR. If the DTC resets, replace the RCDLR.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Tire Pressure Sensor Learn
    •  Control Module References for RCDLR replacement, setup, and programming