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DTC P0500

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 Descriptors

DTC P0500: Vehicle Speed Sensor (VSS) Circuit

DTC P0500 08: Vehicle Speed Sensor (VSS) Circuit Signal Invalid

DTC P0500 11: Vehicle Speed Sensor (VSS) Circuit Above Maximum Threshold

DTC P0500 71: Vehicle Speed Sensor (VSS) Circuit Invalid Serial Data Received

Circuit/System Description

The output speed sensor (OSS) is a hall-effect type sensor. The OSS mounts to the automatic transmission case assembly and connects to the control solenoid valve assembly through a 2-wire harness and connector. The sensor faces the park gear teeth. The sensor receives battery voltage on the OSS supply voltage circuit from the transmission control module (TCM). As the output shaft rotates, the sensor produces a signal frequency based on the number of teeth on the park gear and rotational speed of the output shaft. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses the OSS signal to determine line pressure, transmission shift patterns, vehicle speed and gear ratio. The TCM also broadcasts the transmission output speed. The ECM continuously monitors the serial data for the transmission output speed and uses the data to calculate the vehicle speed.

Conditions for Running the DTC

    • The engine is running.
    • The DTCs run continuously once the above condition is met.

Conditions for Setting the DTC

P0500 08

The ECM detects the vehicle speed is less than 1 km/h for greater than 5 seconds with engine speed and engine torque greater than a threshold value that is calibration dependant.

P0500 11

The ECM detects the vehicle speed is greater than 300 km/h for greater than 1 second.

P0500 71

The ECM detects the CAN signal is not valid for greater than 2 seconds.

Action Taken When the DTC Sets

DTC P0500 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0500 is a Type B DTC.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Component Description for ISS and OSS information.

Electrical Information Reference

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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition On, observe the DTC information with a scan tool. Verify no TCM OSS DTCs or communication DTCs are set.
  2. If any TCM or communication DTCs are set, diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  3. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the TCM Transmission OSS parameter on the scan tool. The Transmission OSS parameter should vary with the vehicle speed and not drop out.
  4. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the ECM Vehicle Speed Sensor parameter. The Vehicle Speed Sensor parameter should vary with the vehicle speed and not drop out.
  5. If DTC P0500 sets, diagnosis is accomplished by looking for an intermittent serial data fault. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    • Refer to Control Module References for control solenoid valve assembly replacement, set-up, and programming.
    • Perform the Transmission Adaptive Values Learn following all transmission related repairs.
   


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