A/T System

DTC Troubleshooting: P0603 (A/T System)

DTC P0603: PCM Internal Control Module Keep Alive Memory (KAM) Error

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information. Reading and Clearing Diagnostic Trouble Codes

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Pending or Confirmed DTCs in the PGM-FI SYSTEM with the HDS.

Is DTC P0603 indicated in the PGM-FI SYSTEM?
YES - Go to the DTC P0603 troubleshooting in the PGM-FI SYSTEM.

NO - Go to step 4.


4. Check for Pending or Confirmed DTCs in the A/T SYSTEM with the HDS.

Is DTC P0603 indicated in the A/T SYSTEM?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.


5. Update the PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes

6. Turn the ignition switch to ON (II).

7. Check for Pending or Confirmed DTCs in the A/T SYSTEM with the HDS.

Is DTC P0603 indicated in the A/T SYSTEM?
YES - Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then go to step 6. If the PCM was substituted, go to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.