2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1578
* The high voltage contactor relays are closed.
* Ignition voltage is 8-18V.
Conditions for Setting the DTC
P1AEC and P1AED
The MCM hybrid battery high voltage sensor measurements are greater than 30V apart.
P1AEE and P1AEF
The MCM hybrid battery high voltage sensor monitors greater than 475V.
Action Taken When the DTC Sets
* DTCs P1AEC, P1AED, P1AEE and P1AEF 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 P1AEC, P1AED, P1AEE and P1AEF are Type A DTCs.
Diagnostic Aids
DTCs P1AEC and P1AED compare the MCM measured high voltage to the BECM measurement of high voltage which is broadcast over GMLAN.
Conditions that cause the BECM to improperly measure high voltage or a failure of the BECM to transmit its high voltage value may set this DTC.
DTCs P1AEE and P1AEF indicate that the high voltage contactor relays may have opened while large current flow was present. Conditions such as
loss of BECM power or ground or removal of the high voltage manual disconnect while the vehicle was driving create a voltage surge that may set
this DTC.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Circuit/System Verification
1. Inspect for DTCs P0ABB, P0ABC, P0ABD, loss of communication with the BECM U-code DTCs, or any other concern that would indicate
high voltage to the PIM was interrupted while high current was present.
锟斤拷If the specified DTCs are set, or high voltage interruption is suspected, diagnose them first. Refer to Diagnostic Trouble Code (DTC) List
- Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. Clear the DTC information.
3. Ignition OFF for 1 minute.
4. Ignition ON.
5. Retest for DTCs P1AEC, P1AED, P1AEE and P1AEF.
If the DTC resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM
already contains the latest software version, replace the PIM.
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.
P1AEE
DTC P1AEC-P1AEF
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
