GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2007 🢒 Grand Prix 🢒 Engine 🢒 Cruise Control 🢒 DTC P2162

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 P2162 00 : Vehicle Speed Sensor (VSS) Circuit 1-2 Correlation

Circuit/System Description

The vehicle speed signal circuit is an input to the throttle actuator control (TAC) module from the powertrain control module (PCM) / engine control module (ECM). The PCM (3.8L) / ECM (5.3L) provides a constant voltage signal on the vehicle speed signal circuit. The PCM/ECM creates the vehicle speed signal by internally pulsing the vehicle speed signal to ground. The TAC module uses the vehicle speed signal from the PCM/ECM, in order to determine the vehicle speed. The TAC module then sends a universal asynchronous receiver transmitter (UART) serial data message to the PCM/ECM indicating the vehicle speed that the TAC module has detected.

Conditions for Running the DTC
    • The vehicle is in Drive or Reverse.
    • The vehicle speed is greater than 8 km/h (5 mph).
    • There are no VSS DTCs present in the PCM/ECM.
    • The ignition voltage is between 9-16 volts.

Conditions for Setting the DTC
    • The PCM/ECM sends a 8 km/h (5 mph) signal on the vehicle speed signal circuit to the TAC module. The TAC module sends a UART serial data message to the PCM/ECM indicating that the vehicle speed is 0 km/h (0 mph).
    • The condition must be present for greater than 4 seconds.

Action Taken When the DTC Sets
    • The Cruise Control System is disabled.
    • The PCM/ECM stores a DTC P2162 in memory.
    • The PCM/ECM records the operating conditions at the time the DTC sets. The PCM/ECM displays the failure information in the Failure Records on the scan tool.

Conditions for Clearing the DTC
    • The history DTC clears after 40 malfunction free warm-up cycles.
    • The DTC becomes history when the conditions for setting the DTC are no longer present.

Reference Information

Schematic Reference

Cruise Control Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

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

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions

Circuit/System Verification
  1. Ignition OFF, install a scan tool and raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle .
  2. Engine ON, transmission in Drive, verify that DTC P0502 or P0503 are not set as current in the ECM/PCM.
    3. ⇒If any of the specified codes are set as current, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  3. Engine ON, transmission in Drive, verify the scan tool Vehicle Speed Sensor parameter reads any vehicle speed.
    4. ⇒If the scan tool parameter does not read any vehicle speed, refer to if DTC P0502 or P0503 are current in the PCM. If those codes are not current, replace the PCM/ECM.

Circuit/System Testing
  1. Ignition OFF, install a scan tool and raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle .
  2. Engine ON, transmission in Drive, verify that the scan tool Vehicle Speed Sensor parameter does not display any vehicle speed.
    3. ⇒If the parameter displays any vehicle speed, test the vehicle speed sensor signal circuit for an open/high resistance, a short to ground or a short to voltage. If the circuit tests normal, replace the TAC module.
  3. If all circuits test normal, replace the ECM/PCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PCM (3.8L) / ECM (5.3L) or TAC module replacement, setup, and programming