AutoCodes – Toyota – P2102 2009 Toyota Prius

P2102 2009 Toyota Prius Code - Throttle Actuator Control Motor Circuit Low

Quick Answer

The throttle actuator is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve. Common causes include Dirty throttle body, Faulty Throttle Actuator Control Motor, Throttle Actuator Control Motor harness is open. 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: P2102 2009 Toyota Prius indicates Throttle Actuator Control Motor Circuit Low.
Common causes: Common causes include Dirty throttle body, Faulty Throttle Actuator Control Motor, Throttle Actuator Control Motor harness is open.
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 3,329

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2102 2009 Toyota Prius Description

The throttle actuator is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve. Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not provided to the ECM. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to control the throttle actuator and monitor the throttle opening angle in response to driver inputs.

OBDII Code P2102 2009 Toyota Prius - Throttle Actuator Control Motor Circuit Low - AutoCodes.com — P2102 2009 Toyota Prius Code - Throttle Actuator Control Motor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2102 2009 Toyota Prius?

Dirty throttle body
Faulty Throttle Actuator Control Motor
Throttle Actuator Control Motor harness is open
Throttle Actuator Control Motor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2102 2009 Toyota Prius?

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 P2102 2009 Toyota Prius 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.

Need more information about the P2102 2009 Toyota Prius code?

Need more information on how to fix the P2102 2009 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P2102 2009 Toyota Prius Code

1. What are the common symptoms of OBDII code P2102 in a 2009 Toyota Prius?

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

2. What does the OBDII code P2102 in a 2009 Toyota Prius indicate?

- This code indicates a problem with the Throttle Actuator Control Motor Circuit being low, which can affect the proper functioning of the throttle system.

3. What are the possible causes of OBDII code P2102 in a 2009 Toyota Prius?

- Possible causes include a faulty throttle actuator control motor, damaged wiring or connectors in the circuit, a malfunctioning throttle position sensor, or issues with the engine control module.

4. How can I diagnose the OBDII code P2102 in my 2009 Toyota Prius?

- Diagnosing this code typically involves checking the throttle actuator control motor and its wiring, inspecting the throttle position sensor, and using a scan tool to gather data on the throttle system.

5. Can I drive my 2009 Toyota Prius with OBDII code P2102?

- It is not recommended to drive the vehicle with this code as it can lead to performance issues and potential safety concerns. It is advised to address the issue promptly.

6. How can I repair OBDII code P2102 in my 2009 Toyota Prius?

- Repairing this code may involve replacing the throttle actuator control motor, repairing damaged wiring or connectors, resetting the throttle system, or reprogramming the engine control module.

7. Is it possible to reset OBDII code P2102 in a 2009 Toyota Prius without repairs?

- While clearing the code with a scan tool may temporarily turn off the Check Engine light, the underlying issue causing the code will persist until properly addressed.

8. Can a DIY enthusiast fix OBDII code P2102 in a 2009 Toyota Prius?

- Depending on the DIYer's skill level and access to tools, it may be possible to address this code by replacing the throttle actuator control motor or repairing wiring issues. Otherwise, professional help is recommended.

9. How much does it cost to repair OBDII code P2102 in a 2009 Toyota Prius?

- The cost of repairing this code can vary based on the specific cause, parts needed, and labor rates. It is advisable to consult a mechanic for a more accurate estimate.

10. Are there any preventive maintenance tips to avoid OBDII code P2102 in a 2009 Toyota Prius?

- To prevent this code, it's recommended to regularly inspect the throttle system components, keep up with routine maintenance, and address any issues promptly to avoid potential failures.