The TCM is communicating on the GMLAN serial data bus.
Conditions for Setting the DTC
The TCM detects less than 2 volts on the IGN voltage circuit at the TCM for greater than 10 seconds.
Action Taken When the DTC Sets
* P2534 is a Type A DTC.
* The TCM turns OFF all solenoids.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
P2534 is a Type A DTC.
Diagnostic Aids
* Ensure the transmission pass through connector and harness terminals are clean and not damaged, and the charging system is functioning
correctly.
* The transmission 24-way inline harness connector must be disconnected prior to disconnecting the transmission 16-way inline harness
connector
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Circuit/System Testing
1. Ignition OFF, disconnect the transmission 24-way inline harness connector, then the transmission 16-way in line harness connector at the
transmission, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 12 and ground.
锟斤拷If the test lamp illuminates, test the IGN voltage circuit for a short to voltage.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 12 and ground.
锟斤拷If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
锟斤拷If the circuit tests normal replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid (w/body and TCM) valve assembly
replacement, setup, and programming.
