2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2571
* Barometric Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Barometric Pressure
Sensor/Service and Repair)
* Camshaft Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Camshaft Position Sensor/Service
and Repair)
* Crankshaft Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Crankshaft Position
Sensor/Service and Repair)
* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure
Sensor/Service and Repair)
* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service
and Repair)
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Throttle Body Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and
Repair/Removal and Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0642
DTC P0642, P0643, P0652, or P0653
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 P0642
- 5 Volt Reference 1 Circuit Low Voltage
DTC P0643
- 5 Volt Reference 1 Circuit High Voltage
DTC P0652
- 5 Volt Reference 2 Circuit Low Voltage
DTC P0653
- 5 Volt Reference 2 Circuit High Voltage
Circuit/System Description
The drive motor generator power inverter module (PIM) contains two motor control modules (MCM) and a hybrid powertrain control module
(HPCM). Each MCM utilizes a 5 Volt reference power supply for internal circuit needs. This fault is handled inside the PIM and no external
circuits are involved.
Conditions for Running the DTC
* The control module runs the program to detect an internal fault when the key is ON.
* Ignition voltage is 8-18V.
Conditions for Setting the DTC
The control module has detected an internal malfunction.
Action Taken When the DTC Sets
* DTCs P0642, P0643, P0652 and P0653 are Type A DTCs.
* The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.
Conditions for Clearing the DTC
DTCs P0642, P0643, P0652 and P0653 are Type A DTCs.
