AutoCodes – Toyota – P2102 2003 Toyota Highlander

P2102 2003 Toyota Highlander 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 2003 Toyota Highlander 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 1,974

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 2003 Toyota Highlander 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 2003 Toyota Highlander - Throttle Actuator Control Motor Circuit Low - AutoCodes.com — P2102 2003 Toyota Highlander Code - Throttle Actuator Control Motor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2102 2003 Toyota Highlander?

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 2003 Toyota Highlander?

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 2003 Toyota Highlander 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 2003 Toyota Highlander code?

Need more information on how to fix the P2102 2003 Toyota Highlander 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 2003 Toyota Highlander Code

What does the OBDII code P2102 mean for a 2003 Toyota Highlander?

P2102 indicates a problem with the Throttle Actuator Control (TAC) Motor Circuit, specifically that the circuit is operating at a low voltage.

What are the common symptoms of code P2102 in a 2003 Toyota Highlander?

Symptoms include reduced engine performance, the engine going into limp mode, poor throttle response, and potentially an illuminated Check Engine Light.

What causes the P2102 code to trigger?

Common causes include a faulty throttle actuator motor, damaged or corroded wiring or connectors in the TAC circuit, a malfunctioning electronic throttle body, or a problem with the engine control module (ECM).

Can I drive my 2003 Toyota Highlander with code P2102 active?

Driving is possible but not recommended, as the vehicle may go into limp mode with limited power and throttle response, which could create unsafe driving conditions.

How do I diagnose the P2102 code on my 2003 Toyota Highlander?

Diagnose by inspecting the throttle actuator wiring and connectors for damage or corrosion, testing the throttle actuator motor for proper operation, and using a multimeter to check for voltage and continuity in the TAC circuit.

What repairs can fix the P2102 code?

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

How much does it cost to repair code P2102 on a 2003 Toyota Highlander?

Repair costs vary, but replacing the throttle actuator motor could range from $300 to $800, while wiring repairs may be less expensive. ECM replacement or reprogramming might cost significantly more.

Can a dirty throttle body cause code P2102?

Yes, a dirty or clogged throttle body can restrict movement and cause issues with the throttle actuator motor, potentially triggering this code.

How can I prevent the P2102 code from occurring again?

Regular maintenance, including cleaning the throttle body and inspecting the TAC system wiring and connectors, can help prevent this code from reappearing.

Will resetting the Check Engine Light clear code P2102 permanently?

Resetting the light may clear the code temporarily, but if the underlying issue isnâ€™t fixed, the code will return after the system runs self-diagnostics.