• | 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. |
The transmission control module (TCM) samples the system voltage on the Ignition 1 voltage circuit every 0.1 seconds. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation, which may result in internal damage.
The engine is running.
The TCM detects an open or short to ground on the Ignition 1 voltage circuit.
• | DTC P2534 is a Type A DTC. |
• | The TCM commands maximum line pressure. |
• | The TCM commands an immediate landing to 2nd gear. |
• | The TCM freezes transmission adaptive functions. |
DTC P2534 is a Type A DTC.
• | If all circuit tests are OK, ensure the transmission pass through connector and harness terminals are clean and not damaged, and the charging system is functioning correctly. |
• | Verify there is a good connection at the body control module (BCM) especially if DTC P0700 is also set with this code. |
Automatic Transmission Controls Schematics
Transmission General Information
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Transmission Control Module Scan Tool Information
Test the ignition 1 voltage circuit of the TCM for an open or short to ground.
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for TCM replacement, setup, and programming