What this code means

The PCM detected a malfunction in the Throttle Position Sensor 1 circuit. This code is set when the TP sensor signal is erratic or out of expected range during operation.

Symptoms

• Check Engine Light
• Erratic or no throttle response
• Reduced Engine Power mode
• Stalling
• Rough idle

Common causes

• Faulty throttle position sensor
• Corroded TP sensor connector
• Damaged wiring to TP sensor
• Throttle body failure
• PCM failure (rare)

Diagnostic steps

1. Test TP sensor voltage at idle and WOT
2. Inspect TP sensor connector for corrosion
3. Check wiring continuity
4. Monitor TP sensor with scan tool through range
5. Test 5-volt reference supply

Repair notes

Replace throttle position sensor or throttle body assembly. Clean connectors.

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