AutoCodes – Ford – P2121 2012 Ford Fusion

P2121 2012 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 2012 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 2,159

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 2012 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 2012 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance - AutoCodes.com — P2121 2012 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 2012 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 2012 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 2012 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 2012 Ford Fusion Code

1. What does OBDII code P2121 on a 2012 Ford Fusion indicate?

- OBDII code P2121 indicates an issue with the Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance.

2. What are the common symptoms of OBDII code P2121 on a 2012 Ford Fusion?

- Common symptoms include reduced engine power, hesitation or stalling, rough idling, and the vehicle going into limp mode.

3. What are the possible causes of OBDII code P2121 on a 2012 Ford Fusion?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors in the throttle position sensor circuit, or a problem with the Electronic Throttle Control system.

4. How can I diagnose the cause of OBDII code P2121 on my 2012 Ford Fusion?

- You can diagnose the issue by checking the throttle position sensor's wiring and connections, performing a visual inspection for any signs of damage, and using a scan tool to monitor sensor readings.

5. Can I still drive my 2012 Ford Fusion with OBDII code P2121?

- It is not recommended to drive your vehicle with OBDII code P2121 as it can lead to further damage or unsafe driving conditions. It's best to have the issue diagnosed and repaired promptly.

6. How can I repair OBDII code P2121 on my 2012 Ford Fusion?

- Repairing OBDII code P2121 may involve replacing the throttle position sensor, repairing damaged wiring or connectors, or addressing any issues with the Electronic Throttle Control system.

7. Is it safe to reset the OBDII code P2121 on my 2012 Ford Fusion using a diagnostic tool?

- While you can reset the code using a diagnostic tool, it's important to address the underlying issue causing the code to prevent it from reoccurring. Resetting the code without fixing the problem may lead to further issues.

8. How much does it cost to repair OBDII code P2121 on a 2012 Ford Fusion?

- The cost of repairing OBDII code P2121 can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to repair it yourself or take it to a mechanic. It's best to get a diagnostic and repair estimate from a professional.

9. Can a DIY enthusiast fix OBDII code P2121 on a 2012 Ford Fusion?

- Depending on your experience and tools available, you may be able to address OBDII code P2121 yourself by following repair guides and troubleshooting steps. However, if you're unsure, it's recommended to seek help from a professional.

10. How long does it take to repair OBDII code P2121 on a 2012 Ford Fusion?

- The repair time for OBDII code P2121 can vary based on the complexity of the issue, the availability of parts, and your skill level. It may take anywhere from a few hours to a day or more to diagnose and fix the problem.