6T70/6T75 - Automatic Transmission
DTC P2762, P2763, or P2764
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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/System Description
The torque converter clutch (TCC) pressure control (PC) solenoid is part of the control solenoid valve assembly, which has no serviceable components. The normally low TCC PC solenoid regulates oil pressure to the TCC regulator valve and TCC control valve. Increasing TCC PC solenoid oil pressure increases oil pressure to the torque converter to apply the clutch. The TCM varies the current to the TCC PC solenoid through a low side driver. Increasing current to the TCC PC solenoid increase oil pressure by closing OFF the solenoid exhaust port. Decreasing current to the TCC PC solenoid decreases oil pressure by opening up the solenoid exhaust port. The TCC PC solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.
Conditions for Running the DTC
P2762
* DTC P2762 has not set this ignition cycle.
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
P2763
* No DTCs P0658, P0659 or P2763.
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
* The high side driver is enabled.
P2764
* No DTCs P0658, P0659 or P2764.
* The engine speed is 400 RPM for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
* The high side driver is enabled.
Conditions for Setting the DTC
P2762
The TCM detects an internal electrical performance malfunction of the TCC PC solenoid control circuit where the measured TCC PC solenoid current does not equal the commanded TCC PC solenoid for 5 seconds.
P2763
The TCM detects an open/high resistance or short to voltage on the TCC pressure solenoid control circuit for 5 seconds.
P2764
The TCM detects a short to ground on the TCC pressure solenoid control circuit for 5 seconds.
Action Taken When the DTC Sets
P2762
DTC P2762 is a Type C DTC.
P2763
* DTC P2763 is a Type A DTC.
* The TCM inhibits 6th gear.
* The TCM commands the hot mode shift pattern.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
P2764
* DTC P2764 is a Type A DTC.
* The TCM inhibits TCC.
* The TCM freezes transmission adaptive functions.
* The TCM commands maximum line pressure.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM limits the transmission to reverse and 5th gear.
* The TCM commands the high side driver OFF.
Conditions for Clearing the DIC/DTC
* DTC P2762 is a Type C DTC.
* DTCs P2763 and P2764 are Type A DTCs.
Reference Information
Connector End View Reference
* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views Connector Views
Description and Operation
Transmission General Description Transmission General Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
Circuit/System Verification
1. Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
2. Operate the vehicle in drive range and ensure TCC is commanded ON for 1 minute. Verify with a scan tool the following test status parameters display OK:
* TCC PC Sol. Perf. Test Status
* TCC PC Sol. Ctrl. Ckt. High Voltage Test Status
* TCC PC Sol. Ctrl. Ckt. Low Voltage Test Status
3. 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.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Component Tests and General Diagnostics.
3. Place the control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect the DT-47825-20 adapter harness between the vehicle wire harness electrical connector, and the control solenoid valve assembly electrical connector.
5. Ignition ON, verify with a scan tool the following test status parameters display OK:
* TCC PC Sol. Perf. Test Status
* TCC PC Sol. Ctrl. Ckt. High Voltage Test Status
* TCC PC Sol. Ctrl. Ckt. Low Voltage Test Status
• If any test status parameter displays Fault or Malfunction, replace the control solenoid valve assembly.
Repair Instructions
Note:
* Perform the Reset Transmission Adapts Programming and Relearning following all transmission related repairs.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Component Tests and General Diagnostics.
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for control solenoid valve assembly replacement, setup, and programming