AutoCodes – Generic – P138C

P138C Code - Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance

Quick Answer

The Powertrain Control Module (PCM) monitors the Charge Air Cooler Bypass Position Sensor. Common causes include Faulty Charge Air Cooler Bypass Position Sensor, Charge Air Cooler Bypass Position Sensor harness is open or shorted, Charge Air Cooler Bypass Position 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: P138C indicates Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance.
Common causes: Common causes include Faulty Charge Air Cooler Bypass Position Sensor, Charge Air Cooler Bypass Position Sensor harness is open or shorted, Charge Air Cooler Bypass Position 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 5,619

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P138C Description

The Powertrain Control Module (PCM) monitors the Charge Air Cooler Bypass Position Sensor. The PCM sets the OBDII code when the Charge Air Cooler Bypass Position Sensor is not to factory specifications.

OBDII Code P138C - Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance - AutoCodes.com — P138C Code - Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance

What does this mean?

What are the Possible Causes of the DTC P138C?

Faulty Charge Air Cooler Bypass Position Sensor
Charge Air Cooler Bypass Position Sensor harness is open or shorted
Charge Air Cooler Bypass Position Sensor circuit poor electrical connection

How to Fix the DTC P138C?

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 P138C 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 P138C code?

Need more information on how to fix the P138C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P138C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P138C Ford — Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance

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 P138C Code

1. What are the common symptoms of OBDII code P138C (Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance)?

The common symptoms include decreased engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P138C?

Possible causes include a faulty charge air cooler bypass position sensor, wiring issues, a vacuum leak in the intake system, or a problem with the charge air cooler bypass actuator.

3. How can I diagnose the OBDII code P138C?

Diagnosis typically involves using a scan tool to read the fault code, inspecting the charge air cooler bypass position sensor and related components for damage or wear, and testing the sensor's electrical connections.

4. Can I still drive my vehicle with OBDII code P138C?

It is not recommended to drive your vehicle with this code, as it can lead to further engine damage and decreased performance. It is best to address the issue promptly.

5. How can I repair OBDII code P138C?

Repairing this code may involve replacing the faulty charge air cooler bypass position sensor, repairing any damaged wiring or connections, addressing vacuum leaks, or replacing the charge air cooler bypass actuator.

6. Will resetting the OBDII code P138C make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.

7. How much does it typically cost to repair OBDII code P138C?

The cost of repairing this code can vary depending on the specific issue causing it, the labor rates in your area, and the cost of parts needed for the repair. It is advisable to get a diagnostic from a qualified mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P138C at home?

While some experienced DIY enthusiasts may be able to diagnose and repair this code at home, it is recommended to seek professional help, especially if you are unfamiliar with automotive diagnostics and repairs involving the engine's intake system.

9. How long does it take to repair OBDII code P138C?

The repair time can vary depending on the extent of the issue and the availability of parts. In general, a skilled mechanic should be able to diagnose and repair this code within a few hours to a day.

10. What happens if OBDII code P138C is ignored?

Ignoring this code can lead to reduced engine performance, decreased fuel efficiency, and potential damage to other engine components over time. It is advisable to address the issue promptly to prevent further issues.