2010 Cadillac Truck Escalade RWD V8-6.2L Page 1534
瀚慖f infinite resistance is measured, replace the applicable drive motor generator.
瀚慖f less than infinite is measured, replace the generator control module 3-phase cable assembly.
Open Phase Testing Procedure
1. Remove the 3 phase cable assembly cover from the transmission and inspect the 3 phase cable terminal fasteners for the proper torque and for
arc-flash damage. Refer to Generator Control Module 3-Phase Cable Assembly Replacement ().
瀚慖f any fasteners were loose and no arc flash damage is present, torque the fasteners and re-assemble the vehicle. Retest for the DTC.
瀚慖f any fasteners were loose and arc flash damage is present, replace the applicable drive motor generator assembly and the 3 phase cable
assembly.
2. Disconnect the 3 phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement ().
3. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal.
瀚慖f you measure greater than 0.5 ohms, replace the 3 phase cable assembly.
瀚慖f you measure 0.5 ohms or less, replace the applicable drive motor generator 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 PIM replacement, setup, and programming
* Generator Control Module 3-Phase Cable Assembly Replacement ()
* Drive Motor with Generator Assembly Removal - 1st Position (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/8. Drive Motor with Generator Assembly Removal -
1st Position) or Drive Motor with Generator Assembly Removal - 2nd Position (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/13. Drive Motor with Generator Assembly Removal
- 2nd Position)
P1A0C
DTC P1A0C or P1A0D
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 Descriptors
DTC P1A0C
- Battery Energy Control Module System Voltage Low
DTC P1A0D
- Battery Energy Control Module System Voltage High
Circuit/System Description
The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator
battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is
communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The
hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information. The drive motor generator battery control
module continuously monitors the system voltage on the ignition 1 voltage circuit.
Conditions for Running the DTC
* The vehicle power mode is RUN.
* DTC P0A1F is not set.
Conditions for Setting the DTC
P1A0C
The drive motor generator battery control module detects the ignition voltage is less than 9 V for 3 seconds.
