P2103 critical

Throttle Actuator Control Motor Circuit High

The P2103 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control Motor Circuit High. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $200 - $700 (parts and labor)

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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

Inspect throttle body connector -- ensure it is fully seated and not corroded
Measure throttle motor resistance -- should be 1-5 ohms. Infinite reading indicates open coil
Check motor control wires for shorts to voltage -- disconnect both ends and measure voltage on each wire
Inspect wiring harness for damage where it routes near the battery or other power sources
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.