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Engine-Codes – Land Rover – P1120 Land Rover

P1120 Land Rover Code - Accelerator Pedal Position Sensor Implausible Signals

Quick Answer

The P1120 diagnostic trouble code for Land Rover vehicles indicates an issue with the accelerator pedal position sensor, specifically that implausible signals are being received. Common causes include Faulty accelerator pedal position sensor, Wiring issues or electrical connection problems, Faulty 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
P1120 Land Rover indicates Accelerator Pedal Position Sensor Implausible Signals.
Common causes
Common causes include Faulty accelerator pedal position sensor, Wiring issues or electrical connection problems, Faulty 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 Sep 10, 2024
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Code P1120 Land Rover Description

The P1120 diagnostic trouble code for Land Rover vehicles indicates an issue with the accelerator pedal position sensor, specifically that implausible signals are being received. The accelerator pedal position sensor is a crucial component of the vehicle's electronic throttle control system, which is responsible for relaying the position of the accelerator pedal to the engine control module (ECM). When the ECM receives erratic or inconsistent signals from the sensor, it can lead to a variety of performance issues and potentially unsafe driving conditions.

OBDII Code P1120 Land Rover - Accelerator Pedal Position Sensor Implausible Signals
P1120 Land Rover Code - Accelerator Pedal Position Sensor Implausible Signals

Common Causes of P1120 Land Rover

  1. Faulty accelerator pedal position sensor
  2. Wiring issues or electrical connection problems
  3. Faulty ECM
  4. Corrosion or damage to sensor components
  5. Environmental factors such as moisture or extreme temperatures affecting sensor performance

Symptoms of P1120 Land Rover

  1. Hesitation or surging during acceleration
  2. Poor fuel efficiency
  3. Stalling or rough idle
  4. Loss of power or acceleration
  5. Vehicle going into limp mode

How to Fix P1120 Land Rover

  1. Perform a comprehensive diagnostic scan to confirm the P1120 code and pinpoint the exact cause of the issue.
  2. Inspect the accelerator pedal position sensor and wiring harness for any visible damage or corrosion.
  3. Test the sensor's operation using a multimeter or scan tool to determine if it is sending consistent signals to the ECM.
  4. Replace the accelerator pedal position sensor if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1120 Land Rover

The typical repair costs for addressing a P1120 code on a Land Rover vehicle can vary depending on the specific cause of the issue and the required parts and labor. In general, replacing the accelerator pedal position sensor and addressing any related wiring or electrical issues can range from $200 to $500. Additional diagnostic testing and labor costs may apply, with total repair bills potentially exceeding $700 in some cases. It's advisable to consult with a certified mechanic or dealership for an accurate cost estimate based on the exact circumstances of the vehicle in question.

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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 P1120 Land Rover Code

1. What are the common symptoms of OBDII code P1120 in a Land Rover related to the Accelerator Pedal Position Sensor?

- Common symptoms include poor acceleration, rough idling, stalling, and potential difficulty shifting gears.

2. What are the typical causes of the P1120 code in a Land Rover's Accelerator Pedal Position Sensor?

- The code is often triggered by a faulty accelerator pedal position sensor, wiring issues, or a problem with the engine control module (ECM).

3. How can I diagnose the issue causing the P1120 code in my Land Rover?

- To diagnose the problem, you can perform a visual inspection of the sensor and its wiring, check for loose connections, and use an OBDII scanner to read the code and sensor data.

4. Can I still drive my Land Rover with the P1120 code present?

- It is not recommended to drive the vehicle with the P1120 code as it can lead to further damage and safety concerns. It is best to address the issue promptly.

5. Is it possible to reset the P1120 code in a Land Rover without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear until the root cause is addressed. Resetting the code without fixing the problem may lead to ongoing performance issues.

6. How much does it typically cost to repair the Accelerator Pedal Position Sensor issue causing the P1120 code in a Land Rover?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $150 to $400, including parts and labor.

7. Can a DIY enthusiast replace the Accelerator Pedal Position Sensor in a Land Rover to resolve the P1120 code?

- While it is possible for experienced DIYers to replace the sensor, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

8. Are there any preventive measures to avoid encountering the P1120 code in a Land Rover?

- Regular maintenance, such as checking and cleaning the accelerator pedal position sensor and its connections, can help prevent issues that trigger the P1120 code.

9. Will the P1120 code cause my Land Rover to fail an emissions test?

- Yes, the presence of the P1120 code can cause your vehicle to fail an emissions test as it indicates a problem with the accelerator pedal position sensor.

10. How long does it typically take to repair the Accelerator Pedal Position Sensor issue causing the P1120 code in a Land Rover?

- The repair time can vary based on the exact cause of the issue and the availability of parts, but it usually takes a few hours for a mechanic to diagnose and replace the sensor.

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