AutoCodes – Ford – P2123 2008 Ford Fusion

P2123 2008 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 2008 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 1,631

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 2008 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 2008 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D' Circuit High - AutoCodes.com — P2123 2008 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit High

What does this mean?

What are the Possible Causes of the DTC P2123 2008 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 2008 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 2008 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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Need Help with the Code?

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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 2008 Ford Fusion Code

1. What are the common symptoms of OBDII code P2123 in a 2008 Ford Fusion?

The common symptoms of OBDII code P2123 in a 2008 Ford Fusion include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.

2. What causes the Throttle/Pedal Position Sensor/Switch 'D' Circuit High code (P2123) in a 2008 Ford Fusion?

The P2123 code in a 2008 Ford Fusion is typically caused by a faulty throttle position sensor, a wiring issue in the throttle position sensor circuit, or a problem with the vehicle's Engine Control Module (ECM).

3. How serious is the OBDII code P2123 in a 2008 Ford Fusion?

The P2123 code should be taken seriously as it can affect the drivability of the vehicle. It is recommended to address this issue promptly to avoid potential safety hazards and further damage to the vehicle.

4. Can I continue driving my 2008 Ford Fusion with the P2123 trouble code?

It is not recommended to continue driving your 2008 Ford Fusion with the P2123 trouble code, as it can lead to further issues and potentially unsafe driving conditions. It is best to have the vehicle inspected and repaired as soon as possible.

5. How can I diagnose and repair OBDII code P2123 in my 2008 Ford Fusion?

Diagnosing and repairing the P2123 code typically involves checking the throttle position sensor for proper operation, inspecting the wiring and connectors for any damage, and testing the ECM for faults. It is recommended to seek professional help if you are not familiar with these procedures.

6. Will resetting the OBDII code P2123 in my 2008 Ford Fusion make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P2123 code is not resolved, the code is likely to reappear. It is important to address the root cause of the problem to prevent future occurrences.

7. Is it possible to drive my 2008 Ford Fusion in limp mode due to the P2123 code?

If your 2008 Ford Fusion has entered limp mode due to the P2123 code, it is possible to drive the vehicle at reduced speed to a safe location. However, it is recommended to have the issue diagnosed and repaired promptly to restore normal vehicle operation.

8. Can a DIY enthusiast fix the P2123 code on a 2008 Ford Fusion?

Depending on your skill level and experience with automotive repairs, you may be able to address the P2123 code in your 2008 Ford Fusion. However, due to the complexity of the throttle position sensor system, it is advisable to consult a professional mechanic for accurate diagnosis and repair.

9. How much does it typically cost to fix the Throttle/Pedal Position Sensor/Switch 'D' Circuit High code (P2123) in a 2008 Ford Fusion?

The cost of repairing the P2123 code in a 2008 Ford Fusion can vary depending on the root cause of the issue, parts needed for replacement, and labor costs. It is recommended to obtain quotes from different repair shops for an accurate estimate.

10. Can a faulty throttle position sensor cause other OBDII codes to appear in a 2008 Ford Fusion?

Yes, a faulty throttle position sensor can cause other related OBDII codes to appear in a 2008 Ford Fusion, such as P2122 and P2121. It is important to address these codes promptly to ensure proper vehicle operation.