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 P0965:  Clutch Pressure Control (PC) Solenoid 2 System Performance

DTC P0966:  Clutch Pressure Control (PC) Solenoid 2 Control Circuit Low Voltage

DTC P0967:  Clutch Pressure Control (PC) Solenoid 2 Control Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Clutch PC Solenoid 2 Control

P0966

P0977

P0977

P0965

Clutch PC Solenoid 2 High Side Driver 2

P1833

P1833

P1834

P0965

Typical Scan Tool Data

Clutch PC Solenoid 2

Circuit

Normal Range

Short to Ground

Open

Short to Voltage

Operating Conditions: Key ON, Engine OFF or Engine running, normal operating temperature

Clutch PC 2 Sol. CKT Status

OK

Short to GND

Open/Short to Volts

Open/Short to Volts

High Side Driver 2 CKT Status

OK

Open/Short to GND

Open/Short to GND

Short to Volts

Circuit/System Description

The clutch pressure control (PC) solenoid 2 is integral to the control solenoid (w/body and TCM) valve assembly and has no serviceable parts. The PC solenoid 2 is a normally high-pressure control solenoid which provides fluid pressure to the 3-5-R clutch regulator valve. The TCM controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid off, the exhausting fluid is stopped and the 3-5-R pressure is high. When commanded on, the clutch PC solenoid 2 regulates the amount of exhausting transmission fluid. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD reset.

Conditions for Running the DTC

    • The engine run time is greater than 5 seconds.
    • The clutch PC solenoid 2 is commanded ON.

Conditions for Setting the DTC

P0965

The TCM detects an internal electrical performance malfunction of the clutch PC solenoid control circuit and the actual 3-5-R clutch pressure does not equal the commanded 3-5-R clutch pressure for 300 milliseconds.

P0966

The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid control circuit for 300 milliseconds.

P0967

The TCM detects an internal high voltage electrical malfunction of the clutch PC solenoid control circuit for 300 milliseconds.

Action Taken When the DTC Sets

    • DTCs P0965, P0966, and P0967 are Type A DTCs.
    • The TCM defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse based on the fault detected.
    • The TCM commands maximum line pressure.
    • The TCM freezes transmission adaptive functions.

Conditions for Clearing the DTC

DTCs P0965, P0966, and P0967 are Type A DTCs.

Diagnostic Aids

When attempting to set solenoid electrical DTCs, it may be helpful to ensure the TCM is warmed up and the transmission is operated in second gear long enough to ensure a 3°C (5°F) increase in TCM temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls 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

Description and Operation

Electronic Component Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Perform the following procedure to place the control solenoid (w/body and TCM) valve assembly under the optimal conditions to test solenoid electrical DTCs.

  1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature and then operate the vehicle in third gear for 5 seconds.

Component Testing

The scan tool data parameter Clutch PC 2 Sol. CKT Status normally displays OK.

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 and if no concerns are found replace the control solenoid (w/body and TCM) valve assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    • Replace the control solenoid (w/body and TCM) valve assembly. Refer to Control Module References for replacement, setup, and programming.
    • Perform the Service Fast Learn Adapts if internal transmission repairs are performed.