4L60-E/4L65-E/4L70-E - Automatic Transmission

DTC P2534

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 P2534

-
Ignition 1 Switch Circuit Low Voltage

Circuit/System Description

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.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The TCM detects an open or short to ground on the Ignition 1 voltage circuit.

Action Taken When the DTC Sets

* 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.

Conditions for Clearing the DTC

DTC P2534 is a Type A DTC.

Diagnostic Aids

* 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.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics 4L60-E/4L65-E/4L70-E - Automatic Transmission

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Transmission General Information Transmission General Information

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Transmission Control Module Scan Tool Information (4L60-E) 4L60-E - Automatic TransmissionTransmission Control Module Scan Tool Information (6L45/6L50/6L80/6L90) 6L45/6L50/6L80/6L90 - Automatic Transmission

Circuit/System Testing

Test the ignition 1 voltage circuit of the TCM for an open or short to ground.

Repair Instructions

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

Control Module References Control Module References for TCM replacement, setup, and programming