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 Descriptors

DTC P2762:  Torque Converter Clutch (TCC) Pressure Control Solenoid System Performance

DTC P2763:  Torque Converter Clutch (TCC) Pressure Control Solenoid Control Circuit High Voltage

DTC P2764:  Torque Converter Clutch (TCC) Pressure Control Solenoid Control Circuit Low Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

TCC Pressure Control Solenoid

P2764

P2763

P2763

P2762

TCC Pressure Control Solenoid Side Driver 1

P0658

P0659

P0659

P2762

Typical Scan Tool Data

TCC PC Solenoid

Circuit

Grounded

Open

Shorted to Voltage

Operating Conditions: Engine running, normal operating temperature

Parameter Normal Range: OK

High Side Driver 1 CKT Status

Open/Short to GND

Open/Short to GND

Short to Volts

Circuit/System Description

The torque converter clutch (TCC) pressure control solenoid is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM supplies 12 volts to the TCC pressure control solenoid through the high side driver 2 circuit. The TCM controls the TCC solenoid through the TCC solenoid control circuit. The normally low TCC pressure control solenoid flows fluid to the TCC when commanded ON and exhausts fluid when commanded OFF. The TCC solenoid regulates the transmission fluid pressure to apply the TCC.

Conditions for Running the DTC

P2762

    • DTC P2762 has not failed this ignition cycle.
    • The engine speed is greater than 500 RPM for 5 seconds or greater.
    • The ignition voltage is between 8.6-19.0 volts.

P2763

    • DTC P2763 has not failed this ignition cycle.
    • The engine speed is greater than 500 RPM for 5 seconds or greater.
    • The ignition voltage is between 8.6-19.0 volts.
    • The high side driver is enabled.

P2764

    • DTC P2764 has not failed this ignition cycle.
    • The engine speed is greater than 500 RPM for 5 seconds or greater.
    • The ignition voltage is between 8.6-19.0 volts.
    • The high side driver is enabled.

Conditions for Setting the DTC

P2762

The TCM detects an invalid voltage in the TCC pressure control solenoid circuit for 4.4 seconds or greater in a 5.0 second sample.

P2763

The TCM detects high voltage on the TCC pressure control solenoid control circuit for 4.4 seconds or greater in a 5.0 second sample.

P2764

The TCM detects low voltage on the TCC pressure control solenoid control circuit for 4.4 seconds or greater in a 5.0 second sample.

Action Taken When the DTC Sets

P2762

DTC P2762 is a Type C DTC.

P2763 or P2764

    • DTCs P2763 and P2764 are Type A DTCs.
    • The TCM inhibits TCC.
    • The TCM commands maximum line pressure.
    • The TCM freezes transmission adaptive functions.
    • The TCM forces High Side Driver 1 and 2 OFF.

Conditions for Clearing the DIC/DTC

    • DTC P2762 is a Type C DTC.
    • DTCs P2763 and P2764 are Type A DTCs.

Diagnostic Aids

When attempting to set DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

    •  Automatic Transmission Inline 16-Way Connector End View
    •  Automatic Transmission Internal Connector End Views
    •  Automatic Transmission Related Connector End Views

DTC Type Reference

    •  Diagnostic Trouble Code (DTC) Type Definitions
    •  Diagnostic Trouble Code (DTC) List/Type

Electrical Information Reference

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

Scan Tool Reference

    •  Scan Tool Output Controls
    •  Scan Tool Data List
    •  Scan Tool Data Definitions

Circuit/System Testing

  1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle to ensure TCC engagement for 5 seconds.
  3. Observe the scan tool data parameter High Side Driver 2 CKT Status, the parameter should display OK.
  4. If the parameter displays Open, Short to Volts, Short to GND or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
    If no concerns are found during the inspection, replace the control solenoid (w/body and TCM) valve assembly.
  5. 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.

    •  Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
    • Perform the Service Fast Learn Adapts .