P0606

P0606-ECM HARDWARE ERROR

For complete wiring diagrams refer to Diagrams/Electrical.


Theory of Operation

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

- When Monitored:

With the key on or engine running.

- Set Condition:

ECM had detected internal failures.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test


1. GROUNDS CIRCUITS

Turn the ignition off.

Verify all chassis grounds are properly connected. Refer to Vehicle / Locations.

Are all the grounds properly connected?

Yes

- Go To 2

No

- Repair the ground circuit.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. ECM

Turn ignition on.

Using the electronic scan tool, check DTCs

Is P-0606 stored?

Yes

- Erase DTC. Repair Complete

No

- Replace and program the ECM.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test