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P1121 Infiniti Code - Electric Throttle Control Actuator

Quick Answer

The P1121 Infiniti code refers to an issue with the Electric Throttle Control Actuator. Common causes include Faulty throttle body or throttle position sensor, Wiring issues or electrical connection problems, ECM malfunction or software glitches. 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
P1121 Infiniti indicates Electric Throttle Control Actuator.
Common causes
Common causes include Faulty throttle body or throttle position sensor, Wiring issues or electrical connection problems, ECM malfunction or software glitches.
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 10, 2024
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Code P1121 Infiniti Description

The P1121 Infiniti code refers to an issue with the Electric Throttle Control Actuator. This component is responsible for controlling the throttle opening angle in response to the driver's input through the accelerator pedal. The actuator receives signals from the engine control module (ECM) to adjust the throttle opening, allowing the engine to receive the correct amount of air for optimal performance. When this code is triggered, it indicates a problem with the actuator's operation, which can lead to various performance issues in the vehicle.

OBDII Code P1121 Infiniti - Electric Throttle Control Actuator
P1121 Infiniti Code - Electric Throttle Control Actuator

Common Causes of P1121 Infiniti

  1. Faulty throttle body or throttle position sensor.
  2. Wiring issues or electrical connection problems.
  3. ECM malfunction or software glitches.
  4. Dirty or clogged air filter affecting airflow to the engine.
  5. Mechanical issues within the Electric Throttle Control Actuator.

Symptoms of P1121 Infiniti

  1. Poor acceleration or hesitation when pressing the accelerator pedal.
  2. Rough idling or stalling when the vehicle is at a stop.
  3. Reduced engine power or difficulty maintaining speed.
  4. Check Engine Light illuminated on the dashboard.
  5. Vehicle going into “limp mode” to prevent further damage.

How to Fix P1121 Infiniti

  1. Diagnose the issue using a scan tool to read the fault codes and identify the specific problem with the Electric Throttle Control Actuator.
  2. Inspect the throttle body, throttle position sensor, and wiring connections for any signs of damage or wear.
  3. Clean or replace the throttle body if necessary, ensuring proper airflow to the engine.
  4. Test the Electric Throttle Control Actuator to ensure it is functioning correctly and making proper adjustments to the throttle opening angle.
  5. Clear the fault codes and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1121 Infiniti

The typical repair costs for addressing the P1121 Infiniti code can range from $200 to $500, depending on the specific cause of the issue and the labor rates at the auto repair shop. Parts such as a new throttle body or throttle position sensor may need to be replaced, adding to the overall cost. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate based on your vehicle make and model.

When is the Code Detected?

Electric throttle control actuator does not function properly due to the return spring malfunction or throttle valve is stuck open

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Information for Specific Infiniti Models

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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