P2102Throttle Actuator Control

Throttle Actuator Control Motor Circuit Low

P2102 means the ECM detected low voltage in the throttle actuator control motor circuit, indicating a short to ground or an open that keeps the motor from getting proper current.

🚗 Not recommended. Low circuit voltage often disables normal throttle control.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Wiring shorted to ground or open$50-$300

40%

A short to ground or broken wire pulls the control circuit low.

#2Failed throttle actuator motor / throttle body$150-$600

35%

An internally shorted motor loads the circuit low.

#3Corroded or loose throttle body connector$0-$150

15%

Poor connections drop voltage on the motor circuit.

#4ECM driver fault$200-$1200

10%

A failed internal driver cannot supply the motor properly.

🩺 Common Symptoms

Reduced power / limp mode
Check engine light
Unresponsive throttle
High or erratic idle
Possible stalling

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$600

Shop Cost

$150-$900

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2102

1Inspect the throttle body connector for corrosion or backed-out pins

2Check the motor control wiring for shorts to ground

3Measure motor resistance for an internal short

4Repair wiring or replace the throttle body, then relearn idle

❓ Frequently Asked Questions

Can I drive with a P2102 code?

Avoid it. Low circuit voltage usually puts the car into limp mode with reduced power.

How much does it cost to fix P2102?

Wiring repairs can be cheap, but a throttle body runs $150-$900 at a shop.

What causes P2102?

Usually a short to ground in the motor wiring or an internally shorted throttle actuator motor.

🔗 Related Codes

P2100P2101P2103P2110P2135