What Does P2103 Mean?
The PCM has detected abnormally high voltage in the throttle actuator control motor circuit. This indicates a short to power, open circuit, or high resistance condition in the electronic throttle control system.
Safety Warning
Vehicle may enter limp mode with restricted throttle operation or fail to respond to accelerator pedal input. Can result in unexpected loss of power in hazardous driving conditions.
Common Causes
35%
Open circuit or high resistance in throttle actuator motor windings
30%
Damaged wiring harness with short to voltage or open circuit
20%
Corroded or loose throttle body connector causing high resistance
10%
Failed PCM throttle control driver circuit output stage
5%
Contaminated or seized throttle blade causing excessive motor resistance
Diagnostic Steps
1
Step 1: Inspect throttle body connector for corrosion, terminal back-out, or damaged pins; clean with electrical contact cleaner if needed
2
Step 2: Measure resistance of throttle actuator motor windings; infinite resistance indicates open circuit requiring throttle body replacement
3
Step 3: Check for short to voltage in wiring harness using voltmeter with key on, engine off, throttle body disconnected
4
Step 4: Verify throttle blade moves freely without binding; clean carbon deposits from throttle bore and blade if restricted
5
Step 5: Monitor throttle actuator command vs. actual position with scan tool during manual throttle operation to verify mechanical and electrical function
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected abnormally high voltage in the throttle actuator control motor circuit. This indicates a short to power, open circuit, or high resistance condition in the electronic throttle control system.
The most common cause of P2103 (Throttle Actuator "A" Control Motor Circuit High) is: Open circuit or high resistance in throttle actuator motor windings
Typical repair costs for P2103 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 restricted throttle operation or fail to respond to accelerator pedal input. Can result in unexpected loss of power in hazardous driving conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2103 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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