GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

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

DTC Descriptors

DTC C0550:  Input Failure Of Vehicle Speed

Circuit/System Description

TPMS Receiver Module receives the vehicle speed signal from the transmission control module (TCM) and also receives the information of the tire inflation pressure from the transmitters and the transmitter’s condition. With these information, the TPMS decides that the warning lamp indication is needed or not.

Conditions for Running the DTC

Vehicle speed is above 32 km/h (20 mph).

Conditions for Setting the DTC

    • TCM inoperative
    • Wiring harness damage between TPMS receiver module and TCM

Action Taken When the DTC Sets

TPMS warning lamp blinks for 75 seconds.

Conditions for Clearing the DTC

The conditions that set the DTC are no longer present, the DTC can be cleared by scan tool.

Reference Information

Schematic Reference

Tire Pressure Monitoring System Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

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

Scan Tool Reference

Electronic Brake Control Module Scan Tool Information

Circuit/System Testing

  1. Using the scan tool, verify the vehicle speed signal from the TCM.
  2. Check for less than 1 ohm between the terminal 2 of TPMS Receiver Module and the terminal B3 (North America Vehicles) or terminal 2 (except North America vehicles) of the cluster.
  3. If resistance is not as specified, repair open or high resistance in circuit.
  4. Check for infinite resistance between the terminal 2 of TPMS Receiver Module and ground.
  5. If resistance is not as specified, repair short to ground in circuit.
    If all circuits test normal, replace the TPMS Receiver Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Tire Pressure Monitor System Configuration for TPM module setup, and programming