GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Kodiak C-Series (Conventional) C6/C7/C8 🢒 DTC 🢒 DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610

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 following diagnostic trouble codes (DTCs) are diagnosed in this DTC table:

Important: The DTCs listed below, are not applicable to all vehicles.

    • DTC P0601 Control Module Read Only Memory (ROM)
    • DTC P0603 Control Module Long Term Memory Reset
    • DTC P0604 Control Module Random Access Memory (RAM)
    • DTC P0605 Control Module Processor Error
    • DTC P0606 ECM Processor Fault
    • DTC P1621 Control Module Long Term Memory Performance

Test Description

The number below refers to the step number on the diagnostic table.

  1. Attempt to program the ECM. If the ECM fails to program and an internal ECM fault resets, replace the ECM.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

  1. Ensure that all tool connections are secure.
  2. Ensure the programming equipment is operating correctly.
  3. Ensure the correct software/calibration package is used.
  4. Attempt to program the ECM.

Do any of the internal ECM DTCs reset?

Go to Step 3

Go to Step 5

3

Replace the ECM. Refer to Engine Control Module Replacement/Restore Fuel Rate Data .

Did you complete the replacement?

Go to Step 4

--

4
  1. Use a scan tool to clear DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start and run the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

Go to Step 5

Go to Step 2

5

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK