DTC P0603: Pcm Internal Control Module Keep Alive Memory Error
CAUTION:
When substituting or replacement of PCM is recommended, see PCM REMOVAL & REPLACEMENT
for important precautions.
- Turn ignition on. Using Honda PGM Tester or the HDS, do the DTC CLEAR in the CLEAR menu.
- Wait 1 second.
- Check for Temporary DTCs or DTCs in the DTC menu. If DTC P0603 is set, update the PCM if it does not have the latest software, or substitute a known-good PCM. If the problem goes away with a known-good PCM, replace PCM. If DTC P0603 is not set, problem is intermittent, system is OK at this time.