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P138D Ford Code - Turbocharger/Supercharger Boost Control 'A' Temperature Too High

Quick Answer

The P138D diagnostic trouble code (DTC) for Ford vehicles indicates that the Turbocharger/Supercharger Boost Control 'A' Temperature is Too High. Common causes include Malfunctioning wastegate or wastegate actuator, Clogged or restricted air intake system, Faulty boost pressure sensor. 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
P138D Ford indicates Turbocharger/Supercharger Boost Control 'A' Temperature Too High.
Common causes
Common causes include Malfunctioning wastegate or wastegate actuator, Clogged or restricted air intake system, Faulty boost pressure sensor.
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 12, 2024
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Code P138D Ford Description

The P138D diagnostic trouble code (DTC) for Ford vehicles indicates that the Turbocharger/Supercharger Boost Control 'A' Temperature is Too High. This code is typically associated with turbocharged or supercharged engines and is triggered when the temperature of the boost control system exceeds the predetermined threshold set by the manufacturer. The boost control system is responsible for regulating the amount of boost pressure that the turbocharger or supercharger delivers to the engine. When the temperature of this system becomes too high, it can lead to a variety of performance issues and potential long-term damage if not addressed promptly.

OBDII Code P138D Ford - Turbocharger/Supercharger Boost Control 'A' Temperature Too High
P138D Ford Code - Turbocharger/Supercharger Boost Control 'A' Temperature Too High

Common Causes of P138D Ford

  1. Malfunctioning wastegate or wastegate actuator
  2. Clogged or restricted air intake system
  3. Faulty boost pressure sensor
  4. Leak in the boost control system
  5. High ambient temperatures

Symptoms of P138D Ford

  1. Reduced engine power
  2. Decreased fuel efficiency
  3. Engine misfires
  4. Illuminated check engine light
  5. Limp mode activation

How to Fix P138D Ford

  1. Diagnose the issue using a scan tool to confirm the P138D code and identify the specific component causing the high temperature.
  2. Inspect the wastegate, wastegate actuator, air intake system, boost pressure sensor, and boost control system for any signs of damage or malfunction.
  3. Replace any faulty components, such as a malfunctioning wastegate actuator or a clogged air filter, to restore proper boost control and reduce temperatures.
  4. Clear the DTC and test drive the vehicle to ensure that the issue has been resolved and that the code does not return.
  5. Perform a final check to verify that the repair was successful and that the boost control system is operating within the manufacturer's specified parameters.

Cost to Fix P138D Ford

The typical repair costs for addressing the P138D code can vary depending on the specific cause of the issue and the cost of replacement parts. In general, the cost of parts for components such as a wastegate actuator or a boost pressure sensor can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair cost likely falling between $200 and $800. However, it's important to note that labor rates can vary based on location, vehicle make and model, and other factors, so it's advisable to check with local shops for a more accurate estimate.

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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 P138D Ford Code

1. What are the common symptoms of OBDII code P138D in a Ford vehicle?

- Common symptoms include reduced engine performance, hesitation during acceleration, and potentially an illuminated check engine light.

2. What could be causing the OBDII code P138D indicating Turbocharger/Supercharger Boost Control 'A' Temperature Too High in my Ford?

- Possible causes could be a faulty turbocharger or supercharger, a malfunctioning boost control sensor, or a problem with the cooling system for the turbocharger.

3. How serious is the Turbocharger/Supercharger Boost Control 'A' Temperature Too High code in a Ford?

- This code should be taken seriously as it can lead to reduced engine efficiency and potential long-term damage if left unresolved.

4. Can driving with the P138D code active cause further damage to my Ford's engine?

- Continuously driving with this code can potentially cause damage to the turbocharger or supercharger, leading to more expensive repairs down the line.

5. What are some DIY repair tips for resolving the OBDII code P138D in a Ford?

- DIY repair tips include checking for loose or damaged hoses in the boost system, ensuring proper coolant levels, and inspecting the turbocharger/supercharger for any visible issues.

6. Is it safe to continue driving my Ford with the Turbocharger/Supercharger Boost Control 'A' Temperature Too High code?

- It is not recommended to continue driving the vehicle with this code active, as it can impact engine performance and potentially cause further damage.

7. How can I reset the OBDII code P138D in my Ford after making necessary repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code.

8. Will the OBDII code P138D in a Ford reset itself after a certain number of drive cycles?

- The code may reset itself after several drive cycles if the issue has been resolved, but it is recommended to manually clear the code after making repairs.

9. Are there any specific Ford models known to be more prone to the Turbocharger/Supercharger Boost Control 'A' Temperature Too High issue?

- While this issue can occur in various Ford models with turbocharged engines, it may be more common in vehicles with higher mileage or those subjected to heavy loads.

10. How much can I expect to pay for professional repairs related to the OBDII code P138D in a Ford?

- Repair costs for this code can vary depending on the exact cause of the issue, but they typically range from $200 to $800 at a dealership or auto repair shop.

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