P2109Throttle Actuator Control

Throttle/Pedal Position Sensor A Minimum Stop Performance

P2109 means the throttle position sensor A did not reach its expected minimum (closed throttle) reference, so the ECM cannot verify the throttle plate is fully closing.

🚗 Not recommended. A throttle sensor minimum stop fault can force limp mode.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Carbon buildup or sticking throttle plate$0-$300

40%

Deposits keep the plate from reaching its minimum stop.

#2Failing throttle position sensor / throttle body$150-$600

35%

A worn TPS reads an incorrect minimum position.

#3Wiring or connector fault$50-$300

15%

Poor connections skew the sensor minimum reading.

#4Poor ground or reference voltage$50-$300

10%

A bad reference shifts the closed throttle value.

🩺 Common Symptoms

Reduced power / limp mode
Check engine light
High or erratic idle
Hesitation
Rough idle

💰 Repair Cost: DIY vs Shop

DIY Cost

$0-$600

Shop Cost

$150-$800

📋 Free OBD2 Code Cheat Sheet

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

🔧 How to Diagnose P2109

1Clean the throttle body and inspect the plate

2Read live data for closed throttle position

3Inspect wiring and connectors

4Replace the throttle body if the minimum reading is out of range, then relearn

❓ Frequently Asked Questions

Can I drive with a P2109 code?

Avoid it. It can trigger limp mode and unstable idle.

How much does it cost to fix P2109?

Cleaning is cheap, but a throttle body runs $150-$800 at a shop.

What causes P2109?

Usually carbon buildup or a worn throttle position sensor keeping the plate off its minimum stop.

🔗 Related Codes

P2119P2135P2101P2110P2118