What Does P2102 Mean?
The PCM has detected abnormally low voltage in the throttle actuator control motor circuit. This indicates a short to ground or complete circuit failure in the electronic throttle body motor winding or its control circuitry.
Safety Warning
Vehicle may enter limp mode with severely limited throttle response or fail to accelerate properly. Sudden loss of power can create dangerous situations in traffic.
Common Causes
35%
Shorted throttle actuator motor windings or internal short to ground
30%
Damaged or chafed wiring harness causing short to ground
20%
Corroded or damaged throttle body connector terminals
10%
Failed PCM throttle control driver circuit
5%
Poor ground connection at throttle body or PCM
Diagnostic Steps
1
Step 1: Visually inspect throttle body connector for corrosion, bent pins, or moisture intrusion; disconnect and reconnect to ensure proper connection
2
Step 2: Measure resistance of throttle actuator motor windings at throttle body connector (typically 2-12 ohms); compare to manufacturer specifications
3
Step 3: Check for short to ground in throttle body wiring harness using continuity test from PCM connector to throttle body with harness disconnected at both ends
4
Step 4: Verify ground circuit integrity at throttle body mounting and engine ground points; clean and secure all ground connections
5
Step 5: If all wiring and grounds test good, replace throttle body assembly and retest system
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the throttle actuator control motor circuit. This indicates a short to ground or complete circuit failure in the electronic throttle body motor winding or its control circuitry.
The most common cause of P2102 (Throttle Actuator "A" Control Motor Circuit Low) is: Shorted throttle actuator motor windings or internal short to ground
Typical repair costs for P2102 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode with severely limited throttle response or fail to accelerate properly. Sudden loss of power can create dangerous situations in traffic.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2102 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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