P1605moderate severityPowertrain
PCM Keep Alive Memory Test Failure
on 2021 Ford Mustang Mach-E Standard Range Dual Motor AWD · RWD
What this code means
The PCM Keep Alive Memory self-test has failed. The PCM cannot properly store or retrieve adaptive learning values from its KAM.
Symptoms
- Check Engine Light
- PCM defaults to base calibration
- Rough idle initially
- Harsh transmission shifts
Common causes
- KAM circuit voltage issue
- Faulty KAM fuse or relay
- PCM internal failure
- Battery cable issue
Diagnostic steps
- Check KAM fuse and relay
- Test KAM circuit voltage at PCM connector
- Check battery and alternator
- Clear code and retest — if recurring, suspect PCM failure
Repair notes
Check KAM circuit power supply. Replace fuse if blown. If KAM circuit is OK, PCM may need replacement.
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