AutoCodes – Ford – P2123 2012 Ford Fusion

P2123 2012 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit High

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: P2123 2012 Ford Fusion indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit High.
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 1,779

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 P2123 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 P2123 code sets when The accelerator pedal position (APP) sensor 1 is out of self-test range high.

OBDII Code P2123 2012 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D' Circuit High - AutoCodes.com — P2123 2012 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit High

What does this mean?

What are the Possible Causes of the DTC P2123 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 P2123 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 P2123 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 P2123 2012 Ford Fusion Code

1. What are the common symptoms of OBDII code P2123 in a 2012 Ford Fusion?

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

2. What does the OBDII code P2123 indicate in a 2012 Ford Fusion?

- OBDII code P2123 indicates an issue with the Throttle/Pedal Position Sensor/Switch 'D' Circuit High in the vehicle.

3. What are the possible causes of OBDII code P2123 in a 2012 Ford Fusion?

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

4. How can I diagnose the Throttle/Pedal Position Sensor/Switch 'D' Circuit High issue in my 2012 Ford Fusion?

- Use a scan tool to read the trouble codes, inspect the throttle position sensor and its wiring for damage, and perform a thorough visual inspection of the throttle pedal circuit.

5. Can I still drive my 2012 Ford Fusion with OBDII code P2123 present?

- It is not recommended to drive the vehicle with code P2123 present as it can lead to unsafe driving conditions and potential damage to the engine.

6. How can I repair OBDII code P2123 in my 2012 Ford Fusion?

- Repair options include replacing the faulty throttle position sensor, repairing damaged wiring or connectors, or resetting the engine control module.

7. Is it possible to reset the OBDII code P2123 in a 2012 Ford Fusion without repairs?

- While clearing the code with a scan tool may temporarily turn off the check engine light, it is important to address the underlying issue to prevent further problems.

8. How much does it typically cost to repair OBDII code P2123 in a 2012 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.

9. Can a DIY enthusiast fix OBDII code P2123 in a 2012 Ford Fusion?

- While some simple repairs like sensor replacement or wiring fixes can be done by DIY enthusiasts, it is recommended to consult a professional for proper diagnosis and repair.

10. How can I prevent OBDII code P2123 from occurring in my 2012 Ford Fusion in the future?

- Regularly inspect and maintain the throttle position sensor and its related components, drive responsibly to avoid sudden acceleration or deceleration, and address any engine performance issues promptly.