P3600low severityPowertrain
Auto Start-Stop System Malfunction
on 2015 Subaru Outback 3.6L H6 · AWD
What this code means
The automatic engine start-stop system has been disabled due to a detected fault. The system shuts off the engine at stops to save fuel.
Symptoms
- Start-stop indicator shows fault
- Engine does not shut off at stops
- Start-stop disabled message on dash
- Slightly higher fuel consumption
- Start-stop light flashing
Common causes
- Weak 12V battery
- Battery sensor failure
- Starter motor wear
- Engine temperature out of range
- Brake vacuum insufficient
Diagnostic steps
- Read start-stop system status and inhibit reasons
- Test 12V battery state of health
- Check IBS (intelligent battery sensor)
- Monitor brake vacuum level
- Check starter motor engagement count
Repair notes
Replace 12V battery if state of health is low. Register new battery with BMS. Replace IBS if faulty.
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