Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks the gas pedal isn't going back to where it should when you take your foot off. It's like when a toy car's remote control doesn't let the car stop completely.
The Engine Control Module (ECM) monitors the throttle position sensor to ensure it returns to its minimum stop position when the throttle is closed. If the sensor does not reach this position, the ECM triggers the P2109 code.
The P2109 code is set when the ECM detects that the throttle position sensor A does not return to its minimum stop position. This could be due to a sensor malfunction, mechanical issue, or wiring problem. The throttle position sensor is critical for determining the throttle plate's position, which controls air intake and engine speed.
• Check Engine Light is on
• Poor acceleration
• Engine may stall or idle roughly
• Faulty throttle position sensor
• Wiring issues or poor connections
• Mechanical obstruction in the throttle body
Throttle Position Sensor: A sensor that monitors the position of the throttle in the engine.
ECM: Engine Control Module, the computer that controls the engine's functions.
• Use an OBD-II scanner to confirm the P2109 code.
• Inspect the throttle body and sensor for physical damage or obstructions.
• Check wiring and connections to the throttle position sensor.
• Replace the throttle position sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Clean the throttle body to remove any obstructions.
• OBD-II scanner
• Multimeter
• Throttle body cleaner
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly clean the throttle body.
• Inspect wiring and connectors for wear.
• Perform routine maintenance checks.
Sensor Issue
• Avoid driving aggressively until repaired.
• Get the vehicle checked by a professional mechanic.
• Monitor for any new symptoms.
Check with your vehicle manufacturer for warranty coverage on sensors and electronic components.
This code has been associated with throttle position sensor issues in many vehicles since the introduction of electronic throttle control systems.
Moderate – While the vehicle may still be drivable, it can lead to poor performance and should be addressed soon.
Driving with a faulty throttle position sensor can lead to unexpected vehicle behavior, posing safety risks.
• Engine at operating temperature
• Vehicle parked on a level surface
The throttle position sensor is located on the throttle body, which is usually found between the air intake and the intake manifold.
Q: Can I drive with a P2109 code?
A: It's possible, but not recommended as it can lead to poor performance and safety issues.
Q: How do I reset the P2109 code?
A: After repairs, use an OBD-II scanner to clear the code from the ECM.
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