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2013 SUBARU OUTBACK
2.5L H4•AWD•CVT•gas
12 active safety recalls on this vehicle — view recalls
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Repairs0Labor487Torque2454Fluid9DTC1865Battery1Maintenance0Recalls12
P1560low severityPowertrain

Back-Up Voltage Circuit Malfunction

on 2013 Subaru Outback 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

  1. Check back-up voltage fuse
  2. Measure back-up circuit voltage at PCM connector with key off
  3. Inspect battery terminals for corrosion
  4. Test back-up power relay
  5. Check wiring continuity

Repair notes

Replace the blown fuse or repair wiring in the PCM back-up voltage circuit.

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