2010 Cadillac Truck Escalade RWD V8-6.2L Page 2525
1. Ignition OFF, disconnect the harness connector at the K67 trailer brake control module.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 15 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
3. If all circuits test normal, replace the K67 trailer brake control module.
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 the trailer brake control module replacement, setup and
programming
6L50/6L80/6L90 - Automatic Transmission
DTC P2534
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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 speed is greater than 500 RPM.
* Ignition voltage is between 8.6-19.0 volts.
Conditions for Setting the DTC
The TCM detects 6 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.
