Auto Start-Stop Restart Failure

What this code means

The engine failed to restart after an auto start-stop event. The starter engaged but the engine did not reach running speed or stalled immediately.

Symptoms

• Engine did not restart at green light
• Starter cranking prolonged after stop
• Dashboard warning lights illuminated
• Vehicle rolled in traffic
• Hazard situation created

Common causes

• Starter motor degradation
• Fuel pressure drop during stop
• Engine position sensor error
• Low battery voltage during crank
• Intake manifold vacuum leak

Diagnostic steps

1. Check starter motor engagement force
2. Monitor fuel pressure during and after stop
3. Test battery voltage during restart crank
4. Check engine position sensor signal
5. Inspect intake manifold for vacuum leaks

Repair notes

Replace starter motor if engagement count is high. Check fuel system for pressure retention. Critical safety issue - disable start-stop until resolved.

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