P0604
P0601 - CONTROL MODULE ROMP0602- CONTROL MODULE NOT PROGRAMMED
P0603- CONTROL MODULE LONG TERM MEMORY RESET
P0604- CONTROL MODULE RAM
P0606- CONTROL MODULE INTERNAL PERFORMANCE
P0601, P0603, P0604 and P0606 are type A DTCs. NOTE: The MIL will be commanded On after 5 seconds after the DTC has set.
P0602 is a type D DTC
PROCEDURE FOR REPLACING OR REPROGRAMMING THE ECM
1. Turn ignition Off if the ECM is going to be replaced.
2. Use the Service Stall System to reprogram the new/old ECM. Refer to the Service Stall System (SSS) User Guide for procedure or follow the on-screen instructions.
3. After the ECM has been replaced, use the SSS to perform the ECM passlock relearn procedure. Refer to the SSS User Guide for procedure or follow the on-screen instructions.
4. The ECM will automatically go through a throttle body relearn procedure once the reprogram is complete. The ECM normally will go through a throttle body relearn procedure anytime the ignition is left On with the engine Off for longer than 29 seconds (if the enable conditions have been met). Refer to the P15261P2176 flowchart for these enable conditions. The ECM will take about 2-3 seconds to perform the relearn. To ensure that the procedure has been completed, the ignition should be turned Off for 10 seconds, then turned On, with the engine Off for 1 minute.
5. Clear DTCs in all controllers if any exist. It may be normal for U-type or passlock DTCs to set in other controllers or for the ECM to set U-type, passlock or P0600 DTCs after a reprogram has been performed. Clear DTCs if any are present, then turn the ignition Off for 10 seconds. Turn the ignition On and recheck for DTCs. As long as the LAST TEST for a DTC indicates PASSED on Scan tool, the DTC is not currently failing and most likely will not cause a problem.
6. The ECM will continuously and automatically relearn the crankshaft notch variation necessary for correct misfire diagnostics. No manual procedure is required.