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 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 0 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. |
| • | The engine speed is between 500 and 6,500 RPM for 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
Connector End View Reference
Component Connector End Views
Electrical Information Reference
| • | Testing for Intermittent Conditions and Poor Connections |
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Ignition ON, attempt to establish communication with the BCM using 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 diagnostic procedure.
Refer to Control Module References for TCM replacement, setup, and reprogramming.
