Powertrain Management

DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610

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 P0601
- Control Module Read Only Memory (ROM)

DTC P0602
- Control Module Not Programmed

DTC P0604
- Control Module Random Access Memory (RAM)

DTC P0606
- Control Module Internal 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.


Conditions for Running the DTC

P0601

The checksum calculation at power down in the last drive cycle was completely finished. DTC P0601 runs once an ignition cycle.

P0602

The ignition is ON, with the engine OFF. DTC P0602 runs continuously when the ignition is ON for greater than 1 second.

P0604

The read/write test at power down in the last drive cycle completely finished. DTC P0604 runs once an ignition cycle.

P0606

DTC P0606 runs continuously with ignition ON or engine operating.


Conditions for Setting the DTC

P0601

The ECM detects the incorrect read only memory (ROM) checksum for greater than 30 seconds.

P0602

The ECM detects that programming is incomplete for greater than 1 second.

P0604

The ECM detects random access memory (RAM) errors for greater than 5 seconds.

P0606

The ECM detects an internal condition for greater than 5 seconds.


Action Taken When the DTC Sets

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


Conditions for Clearing the DTC

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


Reference Information
Description and Operation

Engine Control Module Description (Engine Control Module Description)
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)


Circuit/System Verification

1. Ignition ON, observe the scan tool DTC information. DTC P0602 or P0606 should not set.

• If DTC P0602 failed this ignition, program the ECM. If the DTC resets, replace the ECM.
• If DTC P0606 failed this ignition, clear the DTCs with a scan tool and verify the DTC does not reset. If the DTC resets, replace the ECM.

2. Observe the scan tool DTC information. DTC P0601, or P0604 should not set.

• If a DTC failed this ignition, replace the ECM.

3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning) for engine control module replacement, setup, and programming