What this code means

The PCM has detected a general engine performance deviation from expected parameters. The engine is not performing within normal operational thresholds for power output, fuel consumption, or emissions.

Symptoms

• Check Engine Light
• Reduced engine performance
• Poor acceleration
• Rough running
• Increased fuel consumption

Common causes

• Multiple minor faults combining to affect performance
• Worn spark plugs or ignition components
• Partially clogged fuel injectors
• Intake or exhaust restriction
• Low compression in one or more cylinders

Diagnostic steps

1. Run full diagnostic scan for companion codes
2. Perform relative compression test
3. Check fuel injector balance test
4. Inspect spark plugs and ignition components
5. Check intake and exhaust for restrictions

Repair notes

Address any companion codes first; this code typically resolves once the underlying performance issue is corrected.

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