AutoCodes – Ford – P2128 2008 Ford Fusion

P2128 2008 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'E' 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: P2128 2008 Ford Fusion indicates Throttle/Pedal Position Sensor/Switch 'E' 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 1,918

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 P2128 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 accelerator pedal position (APP) sensor 2 is out of self-test range high.

OBDII Code P2128 2008 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'E' Circuit High - AutoCodes.com — P2128 2008 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'E' Circuit High

What does this mean?

What are the Possible Causes of the DTC P2128 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 P2128 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 P2128 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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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 P2128 2008 Ford Fusion Code

What does the OBDII code P2128 indicate on a 2008 Ford Fusion?

Code P2128 indicates that the throttle/pedal position sensor/switch 'E' circuit has a high input, suggesting a possible fault in the pedal position sensor or its circuit.

What are common symptoms of code P2128 in a 2008 Ford Fusion?

Symptoms include engine performance issues such as hesitation or stalling, reduced fuel efficiency, and the engine light being illuminated. In some cases, the vehicle may go into "limp-home" mode.

What can cause the P2128 code to appear in a 2008 Ford Fusion?

Causes can range from a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, to issues with the vehicle's engine control module.

How can I diagnose the P2128 code in my 2008 Ford Fusion?

Diagnosis should start with a visual inspection of the wiring and connectors leading to the throttle position sensor. Use an OBD-II scanner to check for additional codes that could provide further insights. Testing the sensor's voltage output with a multimeter can also help pinpoint the issue.

Is it safe to drive a 2008 Ford Fusion with the P2128 code?

Driving with the P2128 code can be risky as it may lead to unpredictable vehicle behavior, such as sudden stalling or reduced engine power, which can be dangerous especially when driving at high speeds or in heavy traffic.

What repairs can fix the P2128 code in a 2008 Ford Fusion?

Repairs might include replacing the throttle position sensor, repairing or replacing damaged wiring or connectors, or in some cases, reprogramming or replacing the engine control module.

How much does it typically cost to resolve the P2128 code in a 2008 Ford Fusion?

The cost can vary widely depending on the specific repair required. Replacing a throttle position sensor can cost anywhere from $200 to $400, while more extensive electrical repairs or ECM replacement can significantly increase the cost.

Can I replace the throttle position sensor myself to fix the P2128 code on a 2008 Ford Fusion?

If you have some mechanical skill, replacing the throttle position sensor can be a manageable DIY task. However, ensure you have the correct tools and follow a reliable guide or service manual to complete the job accurately.