Electronic Throttle System Malfunction

What this code means

The PCM has detected a general malfunction in the Electronic Throttle Control system. The throttle body is not responding correctly to accelerator pedal input, and the system may enter limp mode to protect the engine.

Symptoms

• Check Engine Light
• Reduced engine power (limp mode)
• Throttle response sluggish or unresponsive
• Engine may idle only
• ETC warning light on

Common causes

• Faulty electronic throttle body
• Accelerator pedal position sensor failure
• Wiring issue in ETC circuit
• Carbon buildup preventing throttle plate movement
• PCM ETC driver failure

Diagnostic steps

1. Check for companion ETC codes
2. Monitor throttle position vs accelerator pedal position on scan tool
3. Inspect throttle body connector and wiring
4. Clean throttle body plate and bore
5. Test accelerator pedal position sensor

Repair notes

Clean the throttle body first; replace the throttle body assembly if the motor or internal sensors have failed.

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