AutoCodes – Lexus – P2109 Lexus

P2109 Lexus 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 Lexus 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.

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Code Popularity 3,183

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2109 Lexus 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 Lexus - Throttle / Pedal Position Sensor 'A' Minimum Stop Performance - AutoCodes.com — P2109 Lexus Code - Throttle / Pedal Position Sensor 'A' Minimum Stop Performance

What does this mean?

What are the Possible Causes of the DTC P2109 Lexus?

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 Lexus?

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 Lexus 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 Lexus Code

1. What are the common symptoms of OBDII code P2109 in a Lexus related to the Throttle / Pedal Position Sensor 'A' Minimum Stop Performance?

- Common symptoms include reduced engine power, poor acceleration, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code P2109 in a Lexus?

- The code P2109 in a Lexus is typically caused by a faulty throttle position sensor, wiring issues, or a problem with the electronic throttle control system.

3. How can I diagnose OBDII code P2109 in my Lexus?

- Diagnosing code P2109 involves using a diagnostic scanner to retrieve the code, checking the throttle position sensor's readings, and inspecting the wiring for any visible damage.

4. Can I drive my Lexus with OBDII code P2109?

- It is not recommended to drive your Lexus with code P2109, as it can lead to unsafe driving conditions due to reduced engine power and acceleration issues.

5. How can I repair OBDII code P2109 in my Lexus related to the Throttle / Pedal Position Sensor 'A' Minimum Stop Performance?

- Repairing code P2109 may involve replacing the throttle position sensor, repairing any wiring issues, or resetting the electronic throttle control system.

6. Is it possible to reset OBDII code P2109 in a Lexus without repairing the issue?

- While you can clear the code with a diagnostic scanner, it is recommended to address the root cause of the problem to prevent the code from reoccurring.

7. How much does it cost to fix OBDII code P2109 in a Lexus at a repair shop?

- The cost of fixing code P2109 in a Lexus can vary depending on the exact cause of the issue, but it typically ranges from $200 to $500 for parts and labor.

8. Can a DIY enthusiast repair OBDII code P2109 in a Lexus at home?

- Depending on your skill level and access to tools, you may be able to repair code P2109 at home by following online guides or repair manuals specific to your Lexus model.

9. How long does it take to repair OBDII code P2109 in a Lexus?

- The repair time for code P2109 in a Lexus can vary but typically takes around 1-2 hours for a professional mechanic to diagnose and fix the issue.

10. What should I do if OBDII code P2109 keeps coming back in my Lexus after repair?

- If code P2109 keeps reappearing in your Lexus after repair, it may indicate an underlying issue that needs further diagnosis by a professional technician.