Throttle Actuator Control Motor Circuit High
What does P2103 mean?
The P2103 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control Motor Circuit High. This is a critical severity code.
Common Symptoms
- Reduced engine power mode activated
- Engine only idles -- no throttle response
- Throttle/reduced power warning on dash
- Vehicle may not restart after shutdown
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Throttle motor control wire shorted to battery voltage Very High
- Faulty electronic throttle body motor (open coil) High
- Disconnected or corroded throttle body connector Moderate
- Wiring damage causing short to another voltage source Moderate
- PCM motor driver circuit failure Low
Step-by-Step Diagnostic Procedure
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Inspect throttle body connector -- ensure it is fully seated and not corroded
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Measure throttle motor resistance -- should be 1-5 ohms. Infinite reading indicates open coil
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Check motor control wires for shorts to voltage -- disconnect both ends and measure voltage on each wire
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Inspect wiring harness for damage where it routes near the battery or other power sources
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Replace electronic throttle body if motor resistance is out of specification
Frequently Asked Questions
Can I drive with code P2103?
No. The vehicle enters a fail-safe mode where the throttle is disabled. The engine will only idle or may not respond to the accelerator at all. This is a safety feature to prevent unintended acceleration from a faulty circuit.
What does circuit high mean for the throttle motor?
Circuit high means the PCM detects higher than expected voltage on the throttle motor control wire. This typically indicates the wire is shorted to battery voltage, the motor coil is open (infinite resistance), or the connector is disconnected.
Can I reset the code and drive?
You can clear the code, but it will return immediately if the underlying problem is not fixed. The PCM will put the vehicle right back into reduced power mode. Do not attempt to bypass the electronic throttle system as it is a critical safety system.