Loss of KAM Power — Open Circuit
2002-2005 Ford Explorer 4.6L V8 🇨🇦
Description
The PCM has detected a loss of Keep Alive Memory (KAM) power. The KAM circuit maintains battery voltage to the PCM to preserve adaptive learning values, fuel trim data, and DTC history when the engine is off.
Symptoms
- Check Engine Light
- Poor idle after battery reconnect
- Transmission shifting harshly initially
- Loss of stored DTCs
- Fuel economy temporarily affected
Common Causes
- Battery recently disconnected
- Blown KAM fuse
- Corroded battery cable or terminal
- Wiring issue in KAM circuit
- Faulty PCM power relay
Diagnostic Steps
- Check KAM fuse
- Inspect battery terminals for corrosion
- Test battery voltage
- Check wiring from battery to PCM KAM circuit
- Verify PCM power relay operation
Repair Notes
Replace blown KAM fuse. Clean battery terminals. Repair wiring. Allow PCM to relearn after fix.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
P1600 on Other Vehicles
Common Questions
What does code P1600 mean on a 2002-2005 Ford Explorer?
P1600 stands for "Loss of KAM Power — Open Circuit". The PCM has detected a loss of Keep Alive Memory (KAM) power. The KAM circuit maintains battery voltage to the PCM to preserve adaptive learning values, fuel trim data, and DTC history when the engine is off.
What are the symptoms of P1600 on a Ford Explorer?
Common symptoms of P1600 include: Check Engine Light, Poor idle after battery reconnect, Transmission shifting harshly initially, Loss of stored DTCs, Fuel economy temporarily affected.
What causes P1600 on a 2002-2005 Ford Explorer?
Common causes of P1600 include: Battery recently disconnected, Blown KAM fuse, Corroded battery cable or terminal, Wiring issue in KAM circuit, Faulty PCM power relay.