AutoCodesScion – P2109 Scion

P2109 Scion Code - Throttle / Pedal Position Sensor 'A' Minimum Stop Performance

Quick Answer

The idling speed is controlled by the Electronic Throttle Control System (ETCS). Common causes include Faulty Throttle with Motor Body Assembly, Throttle with Motor Body Assembly harness is open or shorted, Throttle with Motor Body Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2109 Scion indicates Throttle / Pedal Position Sensor 'A' Minimum Stop Performance.
Common causes
Common causes include Faulty Throttle with Motor Body Assembly, Throttle with Motor Body Assembly harness is open or shorted, Throttle with Motor Body Assembly circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 1,156
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Sep 16, 2022
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Code P2109 Scion Description

The idling speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve. The Engine Control Module (ECM) controls the throttle actuator to adjust the throttle valve opening amount so that the idling speed is maintained at the target idling speed. The Diagnostic Trouble Code (DTC) will be set with the manifold absolute pressure sensor normal and atmospheric pressure 85 kPa (638 mmHg) or more (elevation 1400 m (4592 ft.) or less), when the engine coolant temperature is 45°C (113°F) or less at engine start, the engine is warmed up and conditions for Idle Speed Control (ISC) learning are met, the ISC learning value is approximately 3 times larger than normal even though the intake manifold pressure when idling is normal.
OBDII Code P2109 Scion - Throttle / Pedal Position Sensor 'A' Minimum Stop Performance - AutoCodes.com
P2109 Scion Code - Throttle / Pedal Position Sensor 'A' Minimum Stop Performance

What are the Possible Causes of the DTC P2109 Scion?

  • Faulty Throttle with Motor Body Assembly
  • Throttle with Motor Body Assembly harness is open or shorted
  • Throttle with Motor Body Assembly circuit poor electrical connection

How to Fix the DTC P2109 Scion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2109 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2109 Scion Code

What does the OBDII code P2109 mean for a Scion?

P2109 indicates an issue with the Throttle/Pedal Position Sensor 'A' minimum stop performance, meaning the sensor is detecting a throttle position that is outside of the expected range.

What are common symptoms of code P2109 in a Scion?

Common symptoms include hesitation during acceleration, reduced engine performance, erratic idle, and activation of the check engine light.

What causes the P2109 code to appear on a Scion?

The code can be caused by a faulty throttle position sensor, dirt or debris in the throttle body, wiring issues, or a malfunctioning electronic throttle control system.

Can driving with code P2109 damage my Scion?

Driving with code P2109 may lead to reduced engine performance and could potentially cause further damage to the throttle system if not addressed promptly.

How is code P2109 diagnosed in a Scion?

A mechanic will use a diagnostic scanner to confirm the code, inspect the throttle position sensor, check the wiring and connectors, and test the electronic throttle control system.

How do you fix code P2109 on a Scion?

Repairs may include cleaning the throttle body, replacing the throttle position sensor, repairing damaged wiring, or recalibrating the throttle system.

Can I fix code P2109 on my Scion myself?

If you have experience with car repairs, you can try cleaning the throttle body and checking for obvious wiring issues, but more complex repairs may require professional help.

Does a dirty throttle body cause code P2109 in a Scion?

Yes, a dirty or clogged throttle body can prevent the throttle plate from reaching its expected minimum stop position, triggering the code.

Does the P2109 code require throttle calibration on a Scion?

In some cases, recalibrating the throttle system may be necessary to resolve the issue after repairs are completed.

How much does it cost to fix code P2109 on a Scion?

The repair cost can range from $100 to $400, depending on whether cleaning, sensor replacement, or more extensive repairs are required.

Discuss the causes and fixes for P2109 Scion OBDII Code

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