P1605moderate severityPowertrain
PCM Keep Alive Memory Test Error
on 2014 Mazda Mazda3 2.0L I4 · FWD
What this code means
The PCM Keep Alive Memory self-test has detected an error. The PCM cannot properly store or retrieve adaptive learning values from its internal memory.
Symptoms
- Check Engine Light
- PCM defaults to base calibration
- Rough idle initially after restart
- Harsh transmission shifts
Common causes
- KAM circuit voltage intermittent
- Faulty KAM fuse or relay
- PCM internal memory failure
- Battery cable providing unstable voltage
Diagnostic steps
- Check KAM fuse and relay
- Test KAM circuit voltage at PCM connector
- Check battery and alternator output
- Clear code and retest; if recurring, suspect PCM failure
Repair notes
Check the KAM circuit power supply; replace the PCM if internal memory has failed.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1