P0606

P0606-INTERNAL CONTROL PROCESSOR

Theory of Operation

This fault code is triggered when the internal PCM diagnostics detect a read or write error internal to the module. The PCM illuminates the MIL light immediately when the diagnostic runs and fails. The PCM will turn off the MIL light immediately after the diagnostic runs and passes. This fault code can only be caused by an internal PCM problem and may prevent the engine from starting.

- When Monitored:
With ignition on.

- Set Condition:
ECM has detected internal failures.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

ECM
1. Turn the ignition off.
2. Verify all chassis grounds are properly connected. Perform the CHECKING ECM POWERS AND GROUNDS test procedure. Checking the ECM Power and Ground Circuits
3. Turn ignition on, engine not running.
4. With the scan tool, read DTC's.

Is P-0606 stored?

Yes

- Repair complete.

No

- Replace and program the ECM. Programming and Relearning