P1A6B
DTC P1A63, P1A69, P1A6A, or P1A6B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P1A63
- Starter/Generator Control Module Internal Circuit
DTC P1A69
- Starter/Generator Control Module Random Access Memory (RAM)
DTC P1A6A
- Starter/Generator Control Module Read Only Memory (ROM)
DTC P1A6B
- Starter/Generator Control Module 5 Volt Reference Circuit
Circuit/System Description
The starter/generator control module (SGCM) monitors to detect internal faults. If a fault is detected, the appropriate DTC will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
P1A63
The gate driver voltage fault signal is low or PWM logic error fault signal is low.
P1A69
RAM check error
P1A6A
RAM check error (calculated ROMSUM value does not match with defined value).
P1A6B
5 volt reference fault, 5 volt input AD value (2 byte) is out of the range for 100 ms.
Action Taken When the DTC Sets
P1A63, P1A69, P1A6A, P1A6B
* Stop PWM (MGU shutdown)
* APM PWM Off
Conditions for Clearing the DTC
P1A63, P1A69, P1A6A, P1A6B
Clears 30 seconds after cycle wake up signal.
Diagnostic Aids
P1A63, P1A69, P1A6A, P1A6B
Possible internal electrical failure of the SGCM.
Reference Information
Schematic Reference
Hybrid Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Starter/Generator Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, verify that the latest service software is installed.
2. With a scan tool, clear the DTC.
3. Ignition OFF, wait 30 seconds.
4. Ignition ON, operate the vehicle within the Conditions for Running the DTC and verify the DTC does not reset.
• If the DTC resets, replace the SGCM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for SGCM replacement, setup, and programming