Throttle Actuator Control Motor Circuit Low
What does P2102 mean?
The P2102 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control Motor Circuit Low. This is a critical severity code.
Common Symptoms
- Severe reduced engine power
- Engine stuck at idle or very low RPM
- Throttle does not respond to gas pedal
- Reduced power warning light on
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Throttle motor control wire shorted to ground Very High
- Faulty electronic throttle body motor (internal short) High
- Water or moisture intrusion in throttle body connector Moderate
- Chafed wiring near engine or exhaust Moderate
- PCM motor driver circuit shorted internally Low
Step-by-Step Diagnostic Procedure
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Disconnect throttle body and measure motor pin resistance -- should be 1-5 ohms, not near 0
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Check throttle motor wires for shorts to ground -- disconnect at both ends and measure resistance to ground
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Inspect wiring harness routing for chafing against engine components or heat shields
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Check throttle body connector for water intrusion or contamination causing short circuits
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If wiring is clean, replace electronic throttle body assembly
Frequently Asked Questions
Can I drive with code P2102?
No, the vehicle will not accelerate properly. The PCM detects a short circuit in the throttle motor and shuts down throttle control for safety. The engine may only idle. Have the vehicle towed for repair.
What causes a low circuit in the throttle motor?
A low circuit means the motor control wire has lower resistance than expected, typically from a short to ground. This can be caused by damaged wiring insulation, water in the connector, or an internal fault in the throttle body motor.
Is the electronic throttle body expensive to replace?
Electronic throttle bodies typically cost $150-$400 for the part depending on the vehicle. Labor adds $100-$300. Some aftermarket options are available at lower cost. Always clear codes and perform a throttle relearn after replacement.