AutoCodes – Ford – P2138 2012 Ford Fusion

P2138 2012 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

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: P2138 2012 Ford Fusion indicates Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
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 2,629

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P2138 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. If the APP sensor inputs APP1 and APP2 disagree on the position of the accelerator pedal by more than an expected value, the P2138 is set.

OBDII Code P2138 2012 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation - AutoCodes.com — P2138 2012 Ford Fusion Code - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

What does this mean?

What are the Possible Causes of the DTC P2138 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 P2138 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 P2138 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 P2138 2012 Ford Fusion Code

1. What are the common symptoms of OBDII code P2138 in a 2012 Ford Fusion?

The common symptoms of P2138 include reduced engine power, acceleration hesitation, stalling, and illuminated Check Engine Light.

2. What does the OBDII code P2138 on a 2012 Ford Fusion indicate?

P2138 indicates a Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation issue, suggesting a problem with the throttle position sensor or pedal position sensor.

3. What are the possible causes of OBDII code P2138 in a 2012 Ford Fusion?

Potential causes of P2138 can include a faulty throttle position sensor, pedal position sensor, wiring issues, poor electrical connections, or a problem with the electronic throttle control system.

4. How can I diagnose the OBDII code P2138 in my 2012 Ford Fusion?

Diagnosing P2138 involves checking the throttle and pedal position sensor readings with a scan tool, inspecting the wiring and connections for damage, and performing a throttle body inspection for any signs of wear or malfunction.

5. Can I drive my 2012 Ford Fusion with OBDII code P2138?

It is not recommended to drive the vehicle with P2138 as it can lead to unsafe driving conditions due to reduced power and potential stalling. Immediate attention and repair are advised.

6. How can I repair OBDII code P2138 in my 2012 Ford Fusion?

Repairing P2138 may involve replacing the faulty throttle position sensor or pedal position sensor, repairing damaged wiring or connectors, cleaning the throttle body, and resetting the fault code with a scan tool.

7. Is it possible to reset OBDII code P2138 in a 2012 Ford Fusion without repairs?

While you can clear the fault code temporarily, it is recommended to address the underlying issue causing P2138 to prevent further problems and ensure the vehicle operates correctly.

8. Will OBDII code P2138 in a 2012 Ford Fusion cause permanent damage if left untreated?

Continued driving with P2138 may potentially cause damage to the engine or other related components over time, leading to more costly repairs. It is best to address the issue promptly.

9. How long does it typically take to repair OBDII code P2138 in a 2012 Ford Fusion?

The repair time for P2138 can vary based on the exact cause of the issue. Simple fixes like sensor replacements may take a few hours, while more complex wiring or throttle body repairs could require more time.

10. Can a DIY enthusiast fix OBDII code P2138 in a 2012 Ford Fusion?

Depending on the individual's skill level and access to tools, DIY enthusiasts may be able to address P2138 issues like sensor replacements or basic wiring repairs. However, complex issues may require professional assistance.