AutoCodes – Ford – P2121 2007 Ford Fusion

P2121 2007 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance

Quick Answer

The Accelerator Pedal Position (APP) sensor is an input to the Powertrain Control Module (PCM) and used to determine the amount of torque requested by the operator. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (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: P2121 2007 Ford Fusion indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance.
Common causes: Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (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.

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Code Popularity 2,376

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2121 2007 Ford Fusion Description

The Accelerator Pedal Position (APP) sensor is an input to the Powertrain Control Module (PCM) and used to determine the amount of torque requested by the operator. There are 2 pedal position signals in the sensor. Both signals, APP and APP2, have a positive slope (increasing angle, increasing voltage), but are offset and increase at different rates. The 2 pedal position signals make sure the PCM receives a correct input even if 1 signal has a concern. The PCM determines if a signal is incorrect by calculating where it should be, inferred from the other signals. If a concern is present with one of the circuits the other input is used. There are 2 reference voltage circuits, 2 signal return circuits, and 2 signal circuits (a total of 6 circuits and pins) between the PCM and the APP sensor assembly. The pedal position signal is converted to pedal travel degrees (rotary angle) by the PCM. The software converts these degrees to counts, which is the input to the torque based strategy. The APP sensor fault flag is set for sensor 1 by the PCM, indicating the signal is out of the normal self-test operating range.

OBDII Code P2121 2007 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance - AutoCodes.com — P2121 2007 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P2121 2007 Ford Fusion?

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

How to Fix the DTC P2121 2007 Ford Fusion?

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 P2121 2007 Ford Fusion 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.

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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 P2121 2007 Ford Fusion Code

1. What are the common symptoms of OBDII code P2121 in a 2007 Ford Fusion?

The common symptoms of code P2121 include reduced engine power, hesitation or stalling when accelerating, and in some cases, the vehicle may go into limp mode.

2. What does the Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance code P2121 indicate in a 2007 Ford Fusion?

Code P2121 indicates that there is a problem with the throttle position sensor or throttle pedal position sensor, specifically in circuit 'D', causing the sensor readings to fall outside the expected range.

3. What are the possible causes of OBDII code P2121 in a 2007 Ford Fusion?

Possible causes of code P2121 include a faulty throttle position sensor, issues with the throttle pedal position sensor, wiring or connector problems, or a problem with the electronic throttle control system.

4. How can I diagnose the cause of OBDII code P2121 in my 2007 Ford Fusion?

To diagnose the cause of code P2121, you can start by inspecting the throttle position sensor and pedal position sensor for any visible damage or wear. Check the wiring and connectors for any signs of corrosion or disconnection. Using a scan tool, you can also monitor the sensor readings to identify any abnormalities.

5. Can I still drive my 2007 Ford Fusion with OBDII code P2121?

It is not recommended to drive your vehicle with code P2121, as it can lead to unsafe driving conditions and potential further damage to the engine. It is best to address the issue promptly to ensure the safe operation of your vehicle.

6. How can I repair OBDII code P2121 in my 2007 Ford Fusion?

Repairing code P2121 may involve replacing the faulty throttle position sensor or throttle pedal position sensor. Additionally, checking and repairing any damaged wiring or connectors related to the sensors can help resolve the issue.

7. Is it possible to reset OBDII code P2121 in a 2007 Ford Fusion without fixing the underlying issue?

Resetting the code without addressing the underlying issue will only temporarily clear the code. The problem will likely reappear once the vehicle is driven and the issue persists. It is essential to diagnose and repair the root cause of the code.

8. Will OBDII code P2121 cause damage to other components in a 2007 Ford Fusion if left unresolved?

If left unresolved, code P2121 can potentially cause damage to other components, such as the engine, transmission, or other related systems. It is crucial to address the issue promptly to prevent further damage and ensure the safe operation of your vehicle.

9. Can a DIY enthusiast fix OBDII code P2121 in a 2007 Ford Fusion?

Depending on your level of automotive repair experience, you may be able to address code P2121 as a DIY project. However, it is recommended to have a good understanding of throttle position sensors and related systems before attempting the repair to ensure it is done correctly.

10. How much does it typically cost to repair OBDII code P2121 in a 2007 Ford Fusion?

The cost of repairing code P2121 can vary depending on the specific cause of the issue and whether you choose to address it yourself or take it to a professional mechanic. Costs may include parts such as sensors and labor for diagnosis and repair.