AutoCodes – Ford – P2123 2010 Ford Fusion

P2123 2010 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 2010 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 2,037

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

OBDII Code P2123 2010 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D' Circuit High - AutoCodes.com — P2123 2010 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit High

What does this mean?

What are the Possible Causes of the DTC P2123 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 P2123 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 P2123 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 P2123 2010 Ford Fusion Code

What does the OBDII code P2123 mean for a 2010 Ford Fusion?

P2123 indicates that the Throttle/Pedal Position Sensor/Switch 'D' Circuit is experiencing a high voltage condition, which can affect the vehicle's throttle response.

What are the common symptoms of the P2123 code?

Common symptoms include a check engine light, reduced engine power, erratic acceleration, and, in some cases, the vehicle may enter limp mode to protect the engine.

What could cause the P2123 code to trigger?

Potential causes include a faulty throttle position sensor, damaged wiring or connectors, issues with the accelerator pedal position sensor, or a malfunction in the engine control module (ECM).

How can I diagnose the P2123 code?

Start by using an OBDII scanner to confirm the code, then visually inspect the wiring and connectors for damage. You can also test the throttle position sensor's output voltage with a multimeter.

What are some common repairs for the P2123 code?

Repairs may include replacing the throttle position sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if it is found to be faulty.

Can I drive my 2010 Ford Fusion with the P2123 code active?

While it is possible to drive the vehicle, it is not recommended as it may lead to reduced power and potential safety risks. It's best to address the issue as soon as possible.

Will clearing the P2123 code fix the problem?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn't resolved, the code will likely reappear.

What should I check before replacing the throttle position sensor?

Before replacing the sensor, check the wiring and connectors for any signs of wear, corrosion, or loose connections that could be causing the high voltage reading.

Is the P2123 code specific to the 2010 Ford Fusion?

No, P2123 is a generic OBDII code and can occur in various makes and models, though the specific symptoms and repair procedures may vary.