GDI Fuel Rail Pressure Too Low During Cranking

What this code means

The fuel rail pressure in the GDI system does not reach the minimum required pressure during engine cranking.

Symptoms

• Extended cranking time
• No start condition
• Rough start then smooths out
• Fuel rail pressure reads low on scan tool
• May start after multiple attempts

Common causes

• Worn high-pressure fuel pump
• Fuel injector leaking back
• Rail pressure sensor error
• Low-pressure supply pump weak
• Fuel check valve leaking

Diagnostic steps

1. Monitor rail pressure during cranking
2. Check low-pressure fuel supply
3. Test fuel injector leak-back
4. Inspect high-pressure pump cam follower
5. Measure cranking RPM

Repair notes

{"Replace high-pressure fuel pump. Test fuel injectors for leak-back. Ensure low-pressure supply exceeds minimum feed pressure."}

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