AutoCodes – Toyota – P2102 2008 Toyota Prius

P2102 2008 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 2008 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 3,886

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 2008 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 2008 Toyota Prius - Throttle Actuator Control Motor Circuit Low - AutoCodes.com — P2102 2008 Toyota Prius Code - Throttle Actuator Control Motor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2102 2008 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 2008 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 2008 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 2008 Toyota Prius code?

Need more information on how to fix the P2102 2008 Toyota Prius code? Get Access to Factory Service Manuals

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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 2008 Toyota Prius Code

1. What does the OBDII code P2102 mean on a 2008 Toyota Prius?

Code P2102 indicates a "Throttle Actuator Control Motor Circuit Low," meaning the throttle actuator motor is not functioning properly due to low voltage or resistance in its circuit.

2. What are the common symptoms of code P2102 in a 2008 Toyota Prius?

Common symptoms include reduced engine power, poor acceleration, the throttle not responding, the vehicle entering limp mode, and an illuminated check engine light.

3. What causes the P2102 code to appear on a 2008 Toyota Prius?

Possible causes include a faulty throttle actuator control motor, damaged wiring or connectors in the throttle actuator circuit, a failed throttle body, or issues with the engine control module (ECM).

4. Can driving with a P2102 code damage my 2008 Toyota Prius?

Driving with this code may lead to reduced performance and safety risks due to limited throttle response. Itâ€™s best to address the issue promptly to avoid further damage.

5. How do you diagnose the P2102 code on a 2008 Toyota Prius?

Diagnosis involves checking the throttle actuator motor and related wiring for damage, testing the voltage and resistance in the circuit, and inspecting the throttle body and ECM for faults.

6. What repairs are commonly needed for a P2102 code in a 2008 Toyota Prius?

Repairs may include replacing the throttle actuator motor, repairing or replacing damaged wiring or connectors, cleaning or replacing the throttle body, or reprogramming or replacing the ECM if necessary.

7. Can a dirty throttle body cause the P2102 code on a 2008 Toyota Prius?

Yes, a dirty throttle body can restrict throttle movement and potentially trigger the P2102 code. Cleaning the throttle body may resolve the issue.

8. How much does it cost to fix the P2102 code on a 2008 Toyota Prius?

Repair costs can vary widely, from $100 to $600 or more, depending on whether cleaning, wiring repairs, or throttle body replacement is required.

9. Can a weak battery cause the P2102 code in a 2008 Toyota Prius?

Yes, a weak or failing battery can cause voltage issues that may trigger the P2102 code, as the throttle actuator motor relies on proper voltage to operate.

10. Can I clear the P2102 code without fixing the problem in my 2008 Toyota Prius?

While you can clear the code with an OBDII scanner, the underlying issue will persist, and the code is likely to return unless the problem is addressed.