Idle Speed Control Throttle Position Lower Limit Not Reached

What this code means

The ECU detected that the throttle plate cannot reach its lower limit (closed position) during idle speed control. The minimum throttle opening is higher than expected.

Symptoms

• Idle speed too high
• Check Engine Light
• Cannot achieve low idle
• Increased fuel consumption at idle

Common causes

• Carbon buildup preventing throttle closure
• Throttle body motor binding
• Throttle cable binding (older models)
• Cruise control cable interference
• Damaged throttle body bore

Diagnostic steps

1. Clean throttle body thoroughly
2. Check throttle cable (if equipped) for binding
3. Perform throttle body adaptation
4. Inspect throttle body bore for damage
5. Test throttle motor operation

Repair notes

Clean the throttle body to remove carbon and perform throttle body adaptation.

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