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Engine-Codes – Generic – P138C

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

Quick Answer

The P138C diagnostic trouble code (DTC) refers to the Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance. Common causes include Faulty charge air cooler bypass position sensor, Wiring or electrical connection issues, Bypass valve stuck in a certain position. 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, Wiring or electrical connection issues, Bypass valve stuck in a certain position.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P138C Description

The P138C diagnostic trouble code (DTC) refers to the Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance. The charge air cooler bypass position sensor is a component of the vehicle's turbocharger system, specifically designed to optimize engine performance by regulating the flow of air into the engine. When this sensor fails to operate within the specified minimum or maximum limits, it can lead to various issues that affect the vehicle's overall performance.

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

Common Causes of P138C

  1. Faulty charge air cooler bypass position sensor
  2. Wiring or electrical connection issues
  3. Bypass valve stuck in a certain position
  4. Vacuum leaks in the intake system
  5. Carbon buildup in the turbocharger or intake system

Symptoms of P138C

  1. Decreased engine performance or power loss
  2. Reduced fuel efficiency
  3. Engine misfires or hesitation during acceleration
  4. Check Engine Light (CEL) illuminated
  5. Rough idling or stalling

How to Fix P138C

  1. Use a diagnostic scan tool to confirm the P138C code and identify the specific issue with the charge air cooler bypass position sensor.
  2. Inspect the sensor, wiring, and electrical connections for any visible damage or corrosion. Replace any damaged components.
  3. Check the bypass valve for proper operation and clean or replace it if necessary.
  4. Inspect the intake system for vacuum leaks and repair any damaged hoses or fittings.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P138C

The cost to repair a P138C DTC can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the parts required for this repair, such as a new charge air cooler bypass position sensor, can range from $50 to $200. Labor costs at an auto repair shop typically range from $80 to $150 per hour. Therefore, the total repair cost for addressing a P138C code could range from $150 to $500 or more, depending on the extent of the repairs needed. It is advisable to consult with a qualified mechanic or repair shop for a more accurate estimate based on the specific circumstances of your vehicle.

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Code P138C 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.

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