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Engine-Codes – Chevrolet – P0120 Chevrolet

P0120 Chevrolet Code - Throttle Position Sensor 1 Circuit

Quick Answer

When a Chevrolet vehicle displays diagnostic code P0120, it indicates an issue with the Throttle Position Sensor (TPS) 1 Circuit. Common causes include Worn or damaged throttle position sensor, Loose or corroded wiring connections, Faulty ECU. 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
P0120 Chevrolet indicates Throttle Position Sensor 1 Circuit .
Common causes
Common causes include Worn or damaged throttle position sensor, Loose or corroded wiring connections, Faulty ECU.
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 P0120 Chevrolet Description

When a Chevrolet vehicle displays diagnostic code P0120, it indicates an issue with the Throttle Position Sensor (TPS) 1 Circuit. The TPS is a crucial component that monitors the position of the throttle valve and sends signals to the engine control unit (ECU) to adjust the air-fuel mixture for optimal performance.

OBDII Code P0120 Chevrolet - Throttle Position Sensor 1 Circuit
P0120 Chevrolet Code - Throttle Position Sensor 1 Circuit

Common Causes of P0120 Chevrolet

  1. Worn or damaged throttle position sensor
  2. Loose or corroded wiring connections
  3. Faulty ECU
  4. Contaminated throttle body
  5. Electrical issues such as short circuits or wiring damage

Symptoms of P0120 Chevrolet

  1. Check Engine Light illuminated
  2. Rough idling or stalling
  3. Poor acceleration or throttle response
  4. Engine surging or hesitation
  5. Reduced fuel efficiency

How to Fix P0120 Chevrolet

  1. Perform a diagnostic scan to confirm the P0120 code.
  2. Inspect the throttle position sensor for wear or damage and replace if necessary.
  3. Check and repair any loose or corroded wiring connections.
  4. Clean the throttle body and ensure proper functioning.
  5. Reset the ECU and perform a test drive to verify the issue has been resolved.

Cost to Fix P0120 Chevrolet

The cost of repairing a Throttle Position Sensor 1 Circuit issue can vary depending on the extent of the problem and the specific repairs needed. On average, replacing a faulty TPS can cost between $100 to $300, with additional labor costs ranging from $50 to $150. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's recommended to obtain a quote from a trusted mechanic or dealership for a more accurate estimate.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

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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.

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