Service Information

Volt

DTC P0601-P0604, P0606, P062B, P062F, P0630, P16F3, or P2610 - ECM

Diagnostic Instructions

•	Preform 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: Control Module Read Only Memory Performance

DTC P0602: Control Module Not Programmed

DTC P0603: Control Module Long Term Memory Reset

DTC P0604: Control Module Random Access Memory Performance

DTC P0606: Control Module Processor Performance

DTC P062F: Control Module Long Term Memory Performance

DTC P0630: VIN Not Programmed or Mismatched - Engine Control Module (ECM)

DTC P16F3: Control Module Redundant Memory Performance

DTC P2610: Control Module Ignition off Timer Performance

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed.

The ECM monitors its ability to read and write to the memory. It also monitors a timing function.

Conditions for Running the DTC

P0601, P0602, P0630, P16F3

•	The vehicle is ON.

•	These DTCs run continuously when the above condition is met.

P0603, P062F

•	The vehicle is ON.

•	These DTCs run once per ignition cycle.

P0604

•	The vehicle is ON for greater than 30 s.

•	DTC P0604 runs continuously when the above condition is met.

P0606

•	The system voltage is greater than 11 V.

•	DTC P0606 runs continuously when the above condition is met.

P2610

•	Vehicle OFF.

•	The ECM is not powered down.

•	DTC P2610 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects an internal failure or incomplete programming for more than 10 s.

Action Taken When the DTC Sets

•	DTCs P0601, P0602, P0603, P0604, P0606, P062F, P0630, and P16F3 are Type A DTCs.

•	DTC P2610 is a Type B DTC.

Conditions for Clearing the DTC

•	DTCs P0601, P0602, P0603, P0604, P0606, P062F, P0630, and P16F3 are Type A DTCs.

•	DTC P2610 is a Type B DTC.

Diagnostic Aids

Low voltage or a momentary loss of power or ground to the ECM may cause a DTC to set. Verify the following:

•	The battery cables are clean and tight, and the battery is fully charged. Refer to Battery Inspection/Test

•	The ECM ground circuits do not have an open circuit or high resistance.

•	The ECM power circuits do not have an open circuit, short to ground, or high resistance.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Vehicle in Service Mode, clear the DTC information with a scan tool. Observe the DTC information with the scan tool.
Verify that DTC P0335 or P0651 is not set.

⇒	If DTC P0335 or P0651 is set, refer to DTC P0335 or P0336 or DTC P0641, P0651, P0697, or P06A3 : ECM .

Verify that DTC P0602 or P0630 is not set.

⇒	If DTC P0602 or P0630 is set, program the K20 ECM. Refer to Control Module References . If DTC P0602 or P0630 resets, replace the K20 ECM.

Verify that DTC P0601, P0603, P0604, P0606, P062F, P16F3, or P2610 is not set.

⇒	If a DTC set this ignition, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup.