P138C Ford Code - Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance
Quick Answer
The P138C Ford diagnostic trouble code (DTC) specifically 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 connector issues, Vacuum leaks in the bypass system. 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 Ford 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 connector issues, Vacuum leaks in the bypass system.
- 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 P138C Ford Description
The P138C Ford diagnostic trouble code (DTC) specifically refers to the Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance. This code indicates that there is a malfunction in the position sensor that monitors the charge air cooler bypass, which can affect the engine's performance and efficiency. The charge air cooler is a crucial component in turbocharged engines, as it cools down the compressed air before it enters the engine cylinders, improving combustion efficiency and power output.
Common Causes of P138C Ford
- Faulty charge air cooler bypass position sensor
- Wiring or connector issues
- Vacuum leaks in the bypass system
- Mechanical issues with the bypass valve
- Software or calibration problems in the engine control module
Symptoms of P138C Ford
- Reduced engine performance
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation
- Illumination of the Check Engine Light
How to Fix P138C Ford
- Diagnose the issue by using a scan tool to read the DTC and check the charge air cooler bypass system for any faults.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
- Test the charge air cooler bypass position sensor and the bypass valve for proper operation, replacing any faulty components.
- Clear the DTC and reset the engine control module to see if the issue has been resolved.
- Test drive the vehicle to ensure that the problem has been fixed and that the engine operates correctly.
Cost to Fix P138C Ford
The typical repair costs for addressing the P138C Ford code can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the repair for this code can range from $200 to $500, including parts and labor. However, it's important to note that labor rates and diagnosis time can vary between different auto repair shops and locations. It's recommended to obtain quotes from local mechanics to get a more accurate estimate for the repair.
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Frequently Asked Questions about P138C Ford Code
1. What does the OBDII code P138C mean on a Ford vehicle?
P138C indicates an issue with the Charge Air Cooler Bypass Position Sensor, specifically related to its minimum or maximum stop performance.
2. What are the common symptoms of the P138C code?
Symptoms may include reduced engine performance, poor acceleration, a potential drop in fuel efficiency, and the check engine light being illuminated.
3. What causes the P138C code to appear?
The code can be triggered by a faulty charge air cooler bypass position sensor, wiring issues, a stuck bypass valve, or carbon buildup affecting valve movement.
4. How does the charge air cooler bypass system affect engine performance?
It regulates airflow to optimize engine performance and efficiency. A malfunction can lead to reduced power and improper air-fuel mixture.
5. Can I drive my Ford with a P138C code?
While the vehicle may still be drivable, ignoring the issue can lead to reduced performance and potential damage to the turbocharger or engine over time.
6. How is the P138C code diagnosed?
A mechanic will use a scan tool to confirm the code, visually inspect the sensor and wiring, and check the operation of the bypass valve for obstructions or sticking.
7. What repairs are needed to fix the P138C code?
Repairs may include replacing the charge air cooler bypass position sensor, cleaning or replacing the bypass valve, and repairing any damaged wiring or connectors.
8. How much does it cost to fix the P138C code?
Repair costs can vary but typically range from $100 to $400 depending on whether the sensor, valve, or wiring needs replacement.
9. Can a dirty charge air cooler cause the P138C code?
Yes, carbon buildup or debris in the charge air cooler or bypass valve can restrict movement and trigger this code.
10. Will clearing the P138C code with a scan tool fix the issue?
Clearing the code will reset the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
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