What this code means

The gasoline direct injection (GDI) high-pressure fuel pump is not maintaining the commanded fuel rail pressure. GDI systems operate at 200-3000+ PSI.

Symptoms

• Check Engine Light
• Long crank time
• Rough idle
• Reduced power
• Engine stalling
• Fuel smell from engine bay

Common causes

• Worn fuel pump cam follower
• Internal pump wear
• Low feed pressure from tank pump
• Fuel pump driver module fault
• Contaminated fuel

Diagnostic steps

1. Monitor fuel rail pressure vs commanded
2. Check low-pressure feed pump output
3. Inspect cam follower for wear
4. Test fuel pump driver module
5. Check fuel quality

Repair notes

Replace high-pressure fuel pump and cam follower together. Always replace the follower to prevent repeat failure. Check camshaft lobe for wear.

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