Test Procedure
- AA1 DIAGNOSTIC TROUBLE CODE (DTC) P0605
- DTC P0605 is set when a ROM failure is detected in the PCM.
- Possible causes:
- internal PCM failure
- incorrect PCM calibration
- Key ON, engine OFF.
- Carry out the Key On Engine Off (KOEO) on-demand self-test.
Is DTC P0605 present?
Yes No REFLASH the PCM. CLEAR the DTCs. REPEAT the self-test. If DTC P0605 is present again, INSTALL a new PCM. UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.