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Engine-Codes – Generic – P2104

P2104 Code - Throttle Actuator Control System - Forced Engine Idle

Quick Answer

The P2104 diagnostic trouble code refers to an issue with the Throttle Actuator Control System, specifically indicating that the engine is being forced into idle mode. Common causes include Faulty throttle actuator motor, Wiring or electrical issues in the throttle actuator control circuit, Dirty or clogged throttle body. 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
P2104 indicates Throttle Actuator Control System - Forced Engine Idle.
Common causes
Common causes include Faulty throttle actuator motor, Wiring or electrical issues in the throttle actuator control circuit, Dirty or clogged throttle body.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P2104 Description

The P2104 diagnostic trouble code refers to an issue with the Throttle Actuator Control System, specifically indicating that the engine is being forced into idle mode. This code is typically found in vehicles with electronic throttle control systems, where the throttle plate is controlled by an electric motor rather than a traditional mechanical linkage. When this code is triggered, it means that the Engine Control Module (ECM) has detected a problem with the throttle actuator control system, which could result in the engine being limited to idle speed.

OBDII Code P2104 - Throttle Actuator Control System - Forced Engine Idle
P2104 Code - Throttle Actuator Control System - Forced Engine Idle

Common Causes of P2104

  1. Faulty throttle actuator motor
  2. Wiring or electrical issues in the throttle actuator control circuit
  3. Dirty or clogged throttle body
  4. Vacuum leaks in the intake system
  5. Issues with the Engine Control Module (ECM)

Symptoms of P2104

  1. Engine limited to idle speed
  2. Lack of power or acceleration
  3. Vehicle stalling or difficulty starting
  4. Reduced fuel efficiency
  5. Check Engine Light illuminated on the dashboard

How to Fix P2104

  1. Begin by diagnosing the specific cause of the P2104 code using a professional diagnostic scanner to pinpoint the exact issue.
  2. Inspect the throttle actuator motor and its wiring for any signs of damage or malfunction. Replace the motor if necessary.
  3. Clean the throttle body to remove any dirt or debris that may be affecting its operation.
  4. Check for vacuum leaks in the intake system and repair or replace any damaged hoses or gaskets.
  5. If the issue persists, consult a professional mechanic to further investigate potential ECM problems or other underlying issues.

Cost to Fix P2104

The typical repair costs for addressing a P2104 code can vary depending on the specific cause of the issue and the vehicle's make and model. In general, replacing a faulty throttle actuator motor can cost between $200 and $500, including parts and labor. Cleaning the throttle body may cost around $100 to $200, while repairing vacuum leaks could range from $150 to $300. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from local shops for a more accurate estimate.

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Code P2104 Information for Specific Makes

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.

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