P138C Ford 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 Ford 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.
Code P138C Ford Description
What are the Possible Causes of the DTC P138C Ford?
- 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 Ford?
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 Ford 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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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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