P1605
PCM Keep Alive Memory Test Failure
2000-2003 Ford Excursion 7.3L V8 Power Stroke Diesel
Moderate SeverityPowertrain
Description
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.
Related Codes
P1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power Circuit OpenP1600Loss of KAM Power — Open CircuitP1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1600Loss of KAM Power — Open CircuitP1633ECM Malfunction ETCS CircuitP1633Keep Alive Power Voltage Too LowP1633Keep Alive Power Voltage Too LowP1633Keep Alive Power Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633KAM Voltage Too LowP1633ECM Malfunction ETCS Circuit
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 2000-2003 Ford Excursion?
P1605 stands for "PCM Keep Alive Memory Test Failure". The PCM Keep Alive Memory self-test has failed. The PCM cannot properly store or retrieve adaptive learning values from its KAM.
What are the symptoms of P1605 on a Ford Excursion?
Common symptoms of P1605 include: Check Engine Light, PCM defaults to base calibration, Rough idle initially, Harsh transmission shifts.
What causes P1605 on a 2000-2003 Ford Excursion?
Common causes of P1605 include: KAM circuit voltage issue, Faulty KAM fuse or relay, PCM internal failure, Battery cable issue.