What this code means

The fuel rail pressure is higher than the PCM commanded value.

Symptoms

• Check Engine Light
• Hard starting
• Rich running
• Injector damage risk
• Black exhaust smoke

Common causes

• Faulty fuel pressure regulator
• Restricted fuel return line
• Stuck fuel pressure relief valve

Diagnostic steps

1. Monitor fuel pressure with scan tool
2. Test fuel pressure regulator
3. Check return line for restriction
4. Inspect relief valve

Repair notes

Replace fuel pressure regulator or clear fuel return restriction.

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