2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1572
瀚慖f the voltage is less than 40 volts, replace the APM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Power Steering Assist Motor Replacement (See: Steering and Suspension/Steering/Power Steering/Power Steering Motor/Service and
Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for APM or PSCM replacement, setup, and
programming.
P1B0D
DTC P1B0D or P1B0E
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 P1B0D
- Drive Motor 1 Control Module Drive Motor 1 Overspeed
DTC P1B0E
- Drive Motor 2 Control Module Drive Motor 2 Overspeed
Circuit/System Description
The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and
direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor allows the MCM to
determine the exact position, speed and direction of the drive motor generator.
Conditions for Running the DTC
* Ignition voltage is 8-18V.
* MCM temperature and voltage out of range DTCs have not set.
* Drive motor generator speed greater than 11,500 RPM.
Conditions for Setting the DTC
The MCM detects drive motor generator speed greater than 10,000 RPM after an initial detection of greater than 11,500 RPM.
Action Taken When the DTC Sets
* DTCs P1B0D and P1B0E are Type A DTCs.
* The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor
relays.
Conditions for Clearing the DTC
DTCs P1B0D and P1B0E are Type A DTCs.
Diagnostic Aids
* The drive axle and drive motor generator 2 are joined mechanically through a planetary gear set, any condition that allows the rear axle to
rotate too fast while the transmission is in gear may cause DTC P1B0E to set. Ask the operator if the vehicle was subjected to downhill
coasting at an excessive speed.
* A transmission mechanical failure that occurs during high drive motor generator torque may cause these DTCs to set.
* Any condition which causes either MCM to receive incorrect or corrupt GM LAN information may cause these DTCs to set. Inspect for
communication DTCs.
* Repeated drive motor generator operation at speeds in excess of the DTC limits may cause deterioration of the drive motor generator
