2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1614
* 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
P1AFC
MCM 1 detects a loss of SPI bus communication with the HPCM.
P1AFD
MCM 1 detects a loss of SCI bus communication with MCM 2 for 2 seconds.
P1B02
MCM 2 detects a loss of SPI bus communication with the HPCM.
Action Taken When the DTC Sets
* DTCs P1AFC and P1B02 are Type A DTCs.
* DTC P1AFD is a Type B DTC.
* The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.
Conditions for Clearing the DTC
* DTCs P1AFC and P1B02 are Type A DTCs.
* DTC P1AFD is a Type B 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. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTCs P1AFC, P1AFD and P1B02.
Circuit/System Testing
Ignition ON, retest for DTCs P1AFC, P1AFD and P1B02.
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.
P1AFE
DTC P1AF8 or P1AFE
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.
