PCM Keep Alive Memory Test Error
2014-2021 Mazda Mazda6 2.5L I4
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1605 on Other Vehicles
Common Questions
What does code P1605 mean on a 2014-2021 Mazda Mazda6?
P1605 stands for "PCM Keep Alive Memory Test Error". 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.
What are the symptoms of P1605 on a Mazda Mazda6?
Common symptoms of P1605 include: Check Engine Light, PCM defaults to base calibration, Rough idle initially after restart, Harsh transmission shifts.
What causes P1605 on a 2014-2021 Mazda Mazda6?
Common causes of P1605 include: KAM circuit voltage intermittent, Faulty KAM fuse or relay, PCM internal memory failure, Battery cable providing unstable voltage.