For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 DTC 🢒 DTC P2534

DTC P2534 for Cadillac CTS 2009

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 P2534: Ignition 1 Switch Circuit Low Voltage

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 speed is greater than 500 RPM.

•	Ignition voltage is between 8.6-19.0 volts.

Conditions for Setting the DTC

The TCM detects 2 volts or less on the ignition 1 voltage circuit at the TCM for 1.0 second or more.

Action Taken When the DTC Sets

•	DTC P2534 is a Type A DTC.

•	The TCM turns OFF HSD1 and HSD2.

•	The TCM turns OFF all solenoids.

•	The TCM commands maximum line pressure.

•	The TCM freezes transmission adaptive functions.

•	The TCM commands the TCC OFF.

•	The TCM allows the vehicle to operate in transmission protection mode.

•	The TCM disables Tap up and Tap down 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).

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Description and Operation

•	Transmission General Description

•	Transmission Component and System Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Clear the DTC and operate the vehicle under the conditions for running and setting the DTC.

⇒	If the DTC resets, test the TCM ignition 1 voltage circuit for battery positive voltage at the TCM 16-way connector.

⇒	If the voltage is less than battery voltage, test the Ignition 1 voltage circuit for an open or short to ground and repair the circuit as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Perform the Service Fast Learn Adapts if internal transmission repairs are performed.