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 Descriptor
DTC P1762: Transmission Mode Switch Signal CircuitCircuit/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 disables TAP Shift operation. |
Conditions for Clearing the DTC
DTC P1762 is a Type C DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Transmission General Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
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 for further diagnosis. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Refer to Control Module References for TCM replacement, setup, and programming.
