What this code means

The fuel rail pressure has exceeded the maximum safe operating pressure. The pressure relief valve may have activated.

Symptoms

• Check Engine Light
• Fuel smell from engine
• Rough running
• Fuel injector damage risk
• Possible fuel leak at high pressure fittings
• Engine running rich

Common causes

• Pressure relief valve failure
• Fuel pressure regulator stuck
• High-pressure pump stuck in max output
• Blocked fuel return line
• PCM commanding excessive pressure

Diagnostic steps

1. Read fuel rail pressure PID immediately
2. Check if relief valve has opened
3. Inspect high-pressure lines for leaks
4. Test pressure regulator operation
5. Review PCM fuel pressure command

Repair notes

SAFETY ISSUE - high-pressure fuel leak risk. Replace pressure regulator or relief valve. Inspect all high-pressure fittings for damage or weeping.

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