Service Information

Volt

DTC P0601-P0604, P0606, or P062F

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC P0601 00: Control Module Read Only Memory Performance

DTC P0602 00: Control Module Not Programmed

DTC P0603 00: Control Module Long Term Memory Reset

DTC P0604 00: Control Module Random Access Memory Performance

DTC P0606 00: Control Module Processor Performance

DTC P062F 00: Control Module Long Term Memory Performance

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the control module. This diagnostic also addresses if the control module is not programmed. The control module monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved.

Conditions for Running the DTC

•	Vehicle ON.

•	The system voltage is at least 7 V.

Conditions for Setting the DTC

The control module detects an internal malfunction or incomplete programming.

Action Taken When the DTC Sets

•	DTCs P0601, P0602, P0603, P0604, P0606, and P062F are Type A DTCs.

•	The high-voltage contactor relays may open.

Conditions for Clearing the DTC

DTCs P0601, P0602, P0603, P0604, P0606, and P062F are Type A DTCs.

Diagnostic Aids

•	The DTC P0606 may set in Hybrid Powertrain Control Module 2 due to other faults. Do not replace the Hybrid Powertrain Control Module 2 until other DTCs are diagnosed first.

•	The DTC P0606 can falsely set in Hybrid Powertrain Control Module 2 when the 12 V battery has been disconnected. In this case, just disconnect and reconnect the 12 V battery again. If this DTC becomes history, use scan tool to clear this DTC. No further action is required.

•	If stored only as a history DTC and not retrieved as a current DTC, do not replace the control module.

Circuit/System Verification

Note: The DTC P0606 can falsely set in Hybrid Powertrain Control Module 2 when disconnecting the 12 V battery. See Diagnostic Aids section for more information.

Verify that DTC P0606 is not set.

⇒	If the DTC P0606 is set with other DTCs set, diagnose all other DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

⇒	If the DTC P0606 is set without other DTCs set, replace the control module that set the DTC.

Verify that DTC P0602 is not set.

⇒	If the DTC P0602 is set, program the control module that set the DTC. If the DTC P0602 resets, replace the control module that set the DTC.

Verify that DTC P0601, P0603, P0604, or P062F is not set.

⇒	If any of the DTCs are set, replace the control module that set the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup