P1762

DTC P1762

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 P01762
- Transmission Mode Switch Signal Circuit




Circuit/System Description

The Transmission Mode Switch Signal enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This code sets when the rolling count of the transmission control module (TCM) does not match the same value sent from the BCM.


Conditions for Running the DTC

The engine run time is greater than 5 seconds.


Conditions for Setting the DTC

The TCM detects an error in the rolling count value that does not match with the BCM.


Action Taken When the DTC Sets

* DTC P1762 is a Type C DTC.
* The TCM forces normal shift operation.



Conditions for Clearing the DTC

DTC P1762 is a Type C DTC.


Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Component Connector End Views)
Description and Operation

Transmission General Information (Transmission General Information)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Transmission Control Module Scan Tool Information (Transmission Control Module Scan Tool Information)


Circuit/System Testing

Ignition ON, attempt to establish communication with the BCM with a scan tool.

If no communication with the BCM, refer to Control Module References (Programming and Relearning) for further diagnosis.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.


Refer to Control Module References (Programming and Relearning) for TCM replacement, setup and reprogramming.