AutoCodes – Ford – P2121 2010 Ford Fusion

P2121 2010 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 2010 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 2,272

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
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Code P2121 2010 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 2010 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance - AutoCodes.com — P2121 2010 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 2010 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 2010 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 2010 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 2010 Ford Fusion Code

1. What are the common symptoms of OBDII code P2121 in a 2010 Ford Fusion?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and illuminated Check Engine Light.

2. What does the OBDII code P2121 on a 2010 Ford Fusion indicate?

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

3. What are the possible causes of OBDII code P2121 in a 2010 Ford Fusion?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors, throttle body issues, or a problem with the engine control module.

4. How can I diagnose the OBDII code P2121 on my 2010 Ford Fusion?

- Diagnosing the code may involve checking the throttle position sensor's voltage, inspecting the wiring for damage, and testing the throttle body for proper functioning.

5. Can I continue driving my 2010 Ford Fusion with the OBDII code P2121?

- It is not recommended to drive the vehicle with this code active, as it can lead to performance issues and potential safety hazards.

6. What are some repair tips for fixing OBDII code P2121 in a 2010 Ford Fusion?

- Repair tips include replacing the faulty throttle position sensor, repairing any damaged wiring, cleaning the throttle body, and resetting the engine control module.

7. How much does it typically cost to repair OBDII code P2121 on a 2010 Ford Fusion?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can I reset the Check Engine Light after fixing OBDII code P2121 on my 2010 Ford Fusion?

- Yes, the Check Engine Light can be reset using an OBDII scanner after the issue has been resolved and the repair completed.

9. Is OBDII code P2121 a common problem in 2010 Ford Fusion vehicles?

- While it is not one of the most common issues, some 2010 Ford Fusion owners have reported experiencing the P2121 code related to throttle position sensor problems.

10. How can I prevent OBDII code P2121 from occurring in my 2010 Ford Fusion in the future?

- To prevent the code from occurring, it is essential to perform regular maintenance checks, keep the throttle body clean, and address any sensor or wiring issues promptly.