Chevrolet Trax: DTC P2762, P2763, OR P2764

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 Valve Performance

DTC P2763

Torque Converter Clutch (TCC) Pressure Control Solenoid Valve Control Circuit High Voltage

DTC P2764

Torque Converter Clutch (TCC) Pressure Control Solenoid Valve Control Circuit Low Voltage

Circuit/System Description

The torque converter clutch (TCC) pressure control solenoid valve is part of the control solenoid valve assembly which has no serviceable components. The normally low TCC pressure control solenoid valve regulates oil pressure to the TCC regulator valve and TCC control valve. Increasing TCC pressure control solenoid valve oil pressure increases oil pressure to the torque converter to apply the clutch. The transmission control module (TCM) varies the current to the TCC pressure control solenoid valve by controlling the amount of time the low side driver is ON and OFF. Increasing current to the TCC pressure control solenoid valve increases oil pressure by closing OFF the solenoid valve exhaust port. Decreasing current to the TCC pressure control solenoid valve decreases oil pressure by opening up the solenoid valve exhaust port. TCC pressure control solenoid valve power is supplied by the TCM through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.

Conditions for Running the DTC

P2762

• P2762 is not set.
• Engine speed is 400-7,500 RPM for 5 s.
• Ignition voltage is 9-32 V.
• DTC runs continuously when above conditions are met.

P2763 or P2764

• P0658 or P0659 is not set.
• Engine speed is 400-7,500 RPM for 5 s.
• Ignition voltage is 9-32 V.
• High side driver is enabled.
• DTC runs continuously when above conditions are met.

Conditions for Setting the DTC

P2762

TCM detects an internal electrical performance malfunction on the TCC pressure control solenoid valve control circuit where the measured TCC pressure control solenoid valve current does not equal the commanded TCC pressure control solenoid valve current for 5 s.

P2763

TCM detects an open/high resistance or short to voltage on the TCC pressure control solenoid valve control circuit for 5 s

P2764

TCM detects a short to ground on the TCC pressure control solenoid valve control circuit for 5 s.

Action Taken When the DTC Sets

P2762

P2762 is a Type C DTC

P2763

• P2763 is a Type B DTC.
• TCM inhibits 6th gear.
• TCM forces TCC OFF.
• TCM changes to a Hot Mode shift pattern

P2764

• P2764 is a Type A DTC.
• TCM inhibits TCC.
• TCM commands maximum line pressure.
• TCM freezes transmission adaptive functions.
• TCM defaults the transmission to 4th gear and reverse.
• TCM inhibits neutral idle.
• TCM inhibits Tap Up/Down function.
• TCM inhibits manual shifting of forward gears.
• TCM forces the high side driver OFF.
• TCM enables torque management.
• TCM inhibits auto grade braking.
• TCM inhibits powertrain braking.

Conditions for Clearing the DIC/DTC

• P2762 is a Type C DTC.
• P2763 is a Type B DTC.
• P2764 is a Type A DTC.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (Encore, MH8 or MHB) , Automatic Transmission Controls Schematics (Trax, MH8 or MHB)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Inline Harness Connector End Views (Encore) , Inline Harness Connector End Views (Trax)

Description and Operation

• Electronic Component Description
• Transmission Component and System Description
• Transmission General Description

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 (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-48616-10 Adapter Harness

For equivalent regional tools, refer to Special Tools

Circuit/System Verification

1. Operate the vehicle in 2nd gear long enough to ensure at least a 3ºC (5ºF) rise in TCM temperature.
2. Operate the vehicle in drive range and ensure TCC is commanded ON for 1 min.
3. Verify the scan tool parameters listed below do not display Malfunction:

• TCC Pressure Control Solenoid Valve Performance Test Status
• TCC Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status
• TCC Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

If Malfunction is displayed

Refer to Circuit/System Testing.

If Malfunction is not displayed

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

NOTE: You must perform the Circuit/System Verification first.

1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris and clean as necessary. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection.

If contaminated

Repair as necessary.

If not contaminated

3. Verify the resistance is within the specified range for each solenoid valve listed in the Control Solenoid Valve and Transmission Control Module Assembly Inspection

If the resistance is not within range

Replace the Q8 Control Solenoid Valve Assembly.

If the resistance is within range

4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
5. Connect the DT-48616-10 adapter harness between the vehicle harness connector and the Q8 Control Solenoid Valve Assembly connector. Ignition ON.
6. Verify the scan tool parameters listed below do not display Malfunction:

• TCC Pressure Control Solenoid Valve Performance Test Status
• TCC Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status
• TCC Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

If Malfunction is displayed

Replace the Q8 Control Solenoid Valve Assembly.

If Malfunction is not displayed

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Perform the Transmission Adaptive Values Learn following all transmission repairs
• Control Module References - for Control Solenoid Valve Assembly replacement, programming and setup

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