What this code means

The ECU detected that the knock control system has retarded ignition timing on Cylinder 1 to its maximum limit. Persistent knock requires excessive timing retard that exceeds the system capability.

Symptoms

• Check Engine Light
• Loss of power
• Engine pinging or knocking audible
• Reduced fuel economy

Common causes

• Low-octane fuel
• Carbon buildup on piston or valves
• Faulty knock sensor
• Overheating condition
• Incorrect ignition timing

Diagnostic steps

1. Switch to higher-octane fuel and clear codes
2. Check for engine overheating
3. Test knock sensor signal
4. Inspect for carbon buildup
5. Check ignition timing base setting

Repair notes

Use the correct octane fuel; perform carbon cleaning if buildup is present.

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