AutoCodes – Ford – P2138 2008 Ford Fusion

P2138 2008 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 2008 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 2,313

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

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
Comments
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Code P2138 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. 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 2008 Ford Fusion - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation - AutoCodes.com — P2138 2008 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 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 P2138 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 P2138 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.

Need more information about the P2138 2008 Ford Fusion 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 P2138 2008 Ford Fusion Code

1. What are the common symptoms of OBDII code P2138 in a 2008 Ford Fusion?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and illuminated Check Engine Light.

2. What does the OBDII code P2138 indicate in a 2008 Ford Fusion?

- The code indicates a voltage correlation issue between the throttle position sensor and the pedal position sensor.

3. What are the possible causes of OBDII code P2138 in a 2008 Ford Fusion?

- Possible causes include a faulty throttle position sensor, pedal position sensor, wiring issues, or a problem with the electronic control module.

4. How can I diagnose the cause of OBDII code P2138 in my 2008 Ford Fusion?

- A thorough inspection of the throttle and pedal position sensors, as well as their wiring harnesses, using a multimeter and scan tool can help pinpoint the issue.

5. Can I continue driving my 2008 Ford Fusion with OBDII code P2138?

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

6. How can I repair OBDII code P2138 in my 2008 Ford Fusion?

- The repair typically involves replacing either the throttle position sensor, pedal position sensor, or repairing any damaged wiring connections.

7. Are there any DIY tips for fixing OBDII code P2138 in a 2008 Ford Fusion?

- While it is possible to replace the sensors yourself, it is recommended to have a professional diagnose and repair the issue to ensure proper functioning.

8. How much does it cost to fix OBDII code P2138 in a 2008 Ford Fusion?

- The cost of repair can vary depending on the cause of the issue, but it typically ranges from $200 to $500 for parts and labor.

9. Will resetting the OBDII code P2138 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 is not fixed, the code is likely to reappear.

10. How can I prevent OBDII code P2138 from occurring in my 2008 Ford Fusion in the future?

- Regular maintenance, such as keeping sensors clean and checking for any signs of wear or damage, can help prevent this code from recurring.

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