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P0120 Cadillac Code - Throttle Position Sensor 1 Circuit

Quick Answer

The P0120 code for Cadillac indicates a fault in the throttle position sensor 1 circuit. Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the ECM. 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 Cadillac indicates Throttle Position Sensor 1 Circuit .
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the ECM.
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 Aug 30, 2024
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Code P0120 Cadillac Description

The P0120 code for Cadillac indicates a fault in the throttle position sensor 1 circuit. The throttle position sensor (TPS) is a crucial component that monitors the position of the throttle valve and sends this information to the engine control module (ECM). This data is used by the ECM to determine the appropriate air-fuel mixture for combustion. When the TPS circuit malfunctions, it can lead to issues with engine performance, fuel efficiency, and overall drivability of the vehicle.

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

Common Causes of P0120 Cadillac

  1. Faulty throttle position sensor
  2. Damaged or corroded wiring/connectors in the TPS circuit
  3. Issues with the ECM
  4. Vacuum leaks in the intake system
  5. Mechanical problems with the throttle body

Symptoms of P0120 Cadillac

  1. Reduced engine power or acceleration
  2. Engine stalling or hesitation
  3. Rough idling or surging
  4. Poor fuel economy
  5. Illumination of the check engine light

How to Fix P0120 Cadillac

  1. Diagnose the issue using a scan tool to confirm the P0120 code and test the TPS for proper functioning.
  2. Inspect and repair any damaged wiring or connectors in the TPS circuit.
  3. Replace the throttle position sensor if it is found to be faulty.
  4. Check and clean the throttle body for any buildup or obstructions.
  5. Clear the error code and perform a test drive to ensure the issue is resolved.

Cost to Fix P0120 Cadillac

The cost of repairing a throttle position sensor circuit issue like P0120 can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts for a new throttle position sensor can range from $50 to $150, while the labor costs can be between $100 and $200. Overall, you can expect to pay anywhere from $150 to $350 for this repair. It's recommended to get quotes from local auto repair shops to get 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.

Frequently Asked Questions about P0120 Cadillac Code

1. What does OBDII code P0120 mean on a Cadillac?

P0120 indicates a malfunction in the Throttle Position Sensor (TPS) 1 circuit, which monitors the position of the throttle.

2. What are common symptoms of code P0120 on a Cadillac?

Symptoms include poor acceleration, rough idling, stalling, reduced fuel efficiency, and the Check Engine Light being illuminated.

3. What causes code P0120 on a Cadillac?

Common causes include a faulty TPS, wiring issues like shorts or corrosion, or problems with the throttle body assembly.

4. Can I drive my Cadillac with code P0120?

While the vehicle may still be drivable, reduced performance and safety concerns make it advisable to address the issue promptly.

5. How do I diagnose code P0120 on a Cadillac?

Use an OBDII scanner to verify the code, inspect the TPS and surrounding wiring for damage, and test the sensor using a multimeter.

6. How can I fix code P0120 on a Cadillac?

Repair or replace the throttle position sensor, fix damaged wiring, or clean the throttle body if dirt or debris is causing the issue.

7. How much does it cost to repair code P0120 on a Cadillac?

Costs vary but typically range from $150 to $400, depending on whether you replace the TPS or address wiring issues.

8. Will a faulty Throttle Position Sensor damage my Cadillac engine?

While it may not directly damage the engine, prolonged driving with a faulty TPS can cause performance issues and strain other components.

9. Can a dirty throttle body cause code P0120 on a Cadillac?

Yes, a dirty or clogged throttle body can interfere with TPS readings and trigger the P0120 code.

10. Do I need to reset my Cadillac’s ECU after fixing code P0120?

Yes, after repairs, clear the code using an OBDII scanner to reset the ECU and verify that the issue has been resolved.

Discuss the causes and fixes for P0120 Cadillac OBDII Code

Submit a New Comment

  • 2003 escalade codes where is the part find on the car.

    Reply to Comment

  • The P0120 code is for the "Throttle Position Sensor". The sensor is part of the "Throttle Body"

    Reply to Comment