P1560low severityPowertrain
Back-Up Voltage Circuit Malfunction
on 2003 Subaru Baja 2.5L H4 · AWD
What this code means
The PCM has detected a malfunction in the back-up voltage circuit. This circuit provides battery voltage to the PCM memory to preserve adaptive learning values and stored data when the ignition is off.
Symptoms
- Check Engine Light
- Loss of PCM adaptive memory on each key-off
- Slightly rough idle after restart
- Fuel trim relearning each drive cycle
Common causes
- Blown back-up power fuse
- Corroded battery cable or terminal
- Wiring open in back-up voltage circuit
- Faulty back-up power relay
- Battery in poor condition
Diagnostic steps
- Check back-up voltage fuse
- Measure back-up circuit voltage at PCM connector with key off
- Inspect battery terminals for corrosion
- Test back-up power relay
- Check wiring continuity
Repair notes
Replace the blown fuse or repair wiring in the PCM back-up voltage circuit.
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