What Does P2100 Mean?
The throttle actuator control motor circuit has an open circuit condition preventing the ECM from controlling throttle position. This is a critical electronic throttle control (ETC) system failure.
Safety Warning
Vehicle may not accelerate properly or may enter limp mode with fixed throttle position. Engine may run at high idle or fail to respond to accelerator pedal input, creating dangerous driving conditions.
Common Causes
35%
Broken wire or open circuit in throttle actuator motor wiring
30%
Failed throttle body motor or internal open circuit
20%
Corroded or damaged throttle body connector pins
10%
Failed ECM throttle driver circuit or internal fault
5%
Blown fuse or open circuit in power supply to throttle system
Diagnostic Steps
1
Step 1: Visually inspect throttle body connector for damage, corrosion, or backed-out pins
2
Step 2: Measure throttle motor resistance across both motor terminals (typically 1-3 ohms)
3
Step 3: Check for voltage supply to throttle body with key on (typically 5V reference and 12V motor power)
4
Step 4: Perform continuity test on throttle motor control wires from ECM to throttle body
5
Step 5: Check ECM ground circuits and power supply circuits for integrity
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The throttle actuator control motor circuit has an open circuit condition preventing the ECM from controlling throttle position. This is a critical electronic throttle control (ETC) system failure.
The most common cause of P2100 (Throttle Actuator "A" Control Motor Circuit/Open) is: Broken wire or open circuit in throttle actuator motor wiring
Typical repair costs for P2100 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not accelerate properly or may enter limp mode with fixed throttle position. Engine may run at high idle or fail to respond to accelerator pedal input, creating dangerous driving conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2100 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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