Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 2010 >> Silverado 3500 2WD V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P2761

P2761




DTC P2761, 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 Descriptor
DTC P2761
- Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit

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

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

Diagnostic Fault Information





Circuit/System Description

The torque converter clutch (TCC) pressure control solenoid controls pressure which is proportional to the current. The transmission fluid pressure from the TCC pressure control solenoid is directed to another valve which regulates the transmission fluid flow and pressure through the torque converter clutch valve to control the rate of TCC apply and release.

The transmission control module (TCM) provides B+ to the TCC solenoid, pressure control solenoid 1 (PCS1), and the main modulation/line pressure control solenoid (MAIN MOD) through a separate solid state device called high side driver 1 (HSD1). The TCM uses a low side driver to control the current flow to the TCC pressure control solenoid. The TCM controls the current to the solenoid by changing the amount of time that the low side driver is on.

Conditions for Running the DTC

* DTC P0657, P0658, or P0659 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.

Conditions for Setting the DTC

P2761

The TCM detects an open circuit on the TCC pressure control solenoid control circuit for 3 seconds.

P2763

The TCM detects a short to voltage on the TCC pressure control solenoid control circuit for 1 second.

P2764

The TCM detects a short to ground on the TCC pressure control solenoid control circuit for 3 seconds.

Action Taken When the DTC Sets

P2761 and P2763
* DTCs P2761 and P2763 are Type B DTCs.
* The TCM inhibits TCC.

P2764
* DTC P2764 is a Type B DTC.
* Reverse is inhibited.

Conditions for Clearing the DTC

DTCs P2761, P2763, and P2764 are Type B DTCs.

Diagnostic Aids

P2761
* You may have to drive the vehicle in order to experience a condition.
* If DTC P2761 is accompanied by DTC P0960 and/or DTC P2727 the open is most likely in the HSD1 circuit.

P2763 and P2764

You may have to drive the vehicle in order to experience a condition.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference

* Component Connector End Views (Connector Views)
* Inline Harness Connector End Views (Diagrams)

Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component 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 (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, engine OFF, command the TCC Control Solenoid ON and OFF with a scan tool. Observe the scan tool TCC PC Sol. Pressure Command parameter. The TCC PC Sol. Pressure Command parameter should change from 0 kPa (0 psi) to 1,600 kPa (232 psi).
2. 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

1. Ignition OFF, disconnect the X175 harness connector at the transmission.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal L and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the TCM.

3. Connect a test lamp between the control circuit terminal J and the B+ circuit terminal L.
4. Ignition ON, command the TCC Control Solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.

5. Ignition OFF, install the X175 harness connector at the transmission.
6. Remove the transmission oil pan. Refer to Oil Pan Replacement (Service and Repair).
7. Disconnect the TCC Pressure Control Solenoid Valve connector.
8. Connect a test lamp between terminals 1 and 2 of the internal harness.
9. Ignition ON, engine OFF, Command the TCC Control Solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If not the expected results, replace the transmission internal wiring harness. Refer to Wiring Harness Replacement (Service and Repair).

10. If the circuits test normal, test or replace the TCC solenoid.

Component Testing

Static Testing

Note: You must perform the Circuit/System Testing first.

1. Ignition OFF, remove the TCC solenoid from the valve body. Refer to Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2)).
2. Test for an open circuit between the control circuit terminal 2 and TCC solenoid metal case and between the B+ circuit terminal 1 and TCC solenoid metal case.

• If not within the specified range, replace the TCC solenoid.

3. Test for resistance between the control circuit terminal 2 and the B+ circuit terminal 1 of the TCC solenoid. Refer to Temperature Versus Resistance (Transmission Fluid Temperature Sensor) (Temperature Versus Resistance (Transmission Fluid Temperature Sensor))Temperature Versus Resistance (Speed Sensor) (Temperature Versus Resistance (Speed Sensor))Temperature Versus Resistance (Solenoid) (Temperature Versus Resistance (Solenoid)).

• If not within the specified range, replace the TCC solenoid.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Wiring Harness Replacement (Service and Repair)
* Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2))
* Control Module References (Programming and Relearning) for TCM replacement, setup, and programming

Repair Verification

If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.

pro multis · About Operation CHARM