AutoCodes – Land Rover – P1120 Land Rover

P1120 Land Rover Code - Accelerator Pedal Position Sensor Implausible Signals

Quick Answer

The Accelerator Pedal Position (APP) sensor is located in plastic housing which is integral with the throttle pedal. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, APP Sensor harness is open or shorted, APP Sensor circuit poor electrical connection. 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 (APP) Sensor, APP Sensor harness is open or shorted, APP Sensor circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,018

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1120 Land Rover Description

The Accelerator Pedal Position (APP) sensor is located in plastic housing which is integral with the throttle pedal. The housing is injection moulded and provides location for the APP sensor. The sensor is mounted externally on the housing and is secured with two Torx screws. The external body of the sensor has a six pin connector which accepts a connector on the vehicle wiring harness.
The sensor has a spigot which protrudes into the housing and provides the pivot point for the pedal mechanism. The spigot has a slot which allows for a pin, which is attached to the sensor potentiometers, to rotate through approximately 90°, which relates to pedal movement. The pedal is connected via a link to a drum, which engages with the sensor pin, changing the linear movement of the pedal into rotary movement of the drum. The drum has two steel cables attached to it. The cables are secured to two tension springs which are secured in the opposite end of the housing. The springs provide 'feel' on the pedal movement and require an effort from the driver similar to that of a cable controlled throttle. A detente mechanism is located at the forward end of the housing and is operated by a ball located on the drum. At near maximum throttle pedal movement, the ball contacts the detente mechanism. A spring in the mechanism is compressed and gives the driver the feeling of depressing a 'kickdown' switch when full pedal travel is achieved.
The APP sensor has two potentiometer tracks which each receive a 5V input voltage from the ECM. Track 1 provides an output of 0.5V with the pedal at rest and 2.0V at 100% full throttle. Track 2 provides an output of 0.5V with the pedal at rest and 4.5V at 100% full throttle. The signals from the two tracks are used by the ECM to determine fuelling for engine operation and also by the ECM and the EAT ECU to initiate a kickdown request for the automatic transmission.
The ECM monitors the outputs from each of the potentiometer tracks and can determine the position, rate of change and direction of movement of the throttle pedal. The 'closed throttle' position signal is used by the ECM to initiate idle speed control and also overrun fuel cut-off.

OBDII Code P1120 Land Rover - Accelerator Pedal Position Sensor Implausible Signals - AutoCodes.com — P1120 Land Rover Code - Accelerator Pedal Position Sensor Implausible Signals

What does this mean?

What are the Possible Causes of the DTC P1120 Land Rover?

Faulty Accelerator Pedal Position (APP) Sensor
APP Sensor harness is open or shorted
APP Sensor circuit poor electrical connection

How to Fix the DTC P1120 Land Rover?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1120 Land Rover code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1120 Land Rover code?

Need more information on how to fix the P1120 Land Rover code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1120 Land Rover code diagnosed by a professional: Find a repair shop in your area

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.