P1100moderate severityPowertrain
Starter Switch Circuit Malfunction
on 2008 Subaru Legacy 3.0L H6 · AWD
What this code means
The PCM has detected a malfunction in the starter switch circuit. The signal from the ignition switch indicating a start request is not being received correctly by the PCM.
Symptoms
- Check Engine Light
- PCM may not recognize engine cranking state
- Fuel and ignition timing strategy may be incorrect during start
- Extended crank time
Common causes
- Faulty ignition switch
- Wiring issue in starter switch signal circuit
- Corroded ignition switch connector
- Neutral safety switch issue affecting start signal
- PCM input circuit fault
Diagnostic steps
- Check starter switch signal on scan tool during cranking
- Inspect ignition switch connector
- Test starter switch circuit wiring for continuity
- Check neutral safety switch
- Verify PCM receives crank signal
Repair notes
Repair the ignition switch signal circuit or replace the ignition switch if faulty.
Other Powertrain codes on this vehicle
P0001
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P0002
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P0003
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P0004
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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