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Engine-Codes – Generic – P138D

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

Quick Answer

The P138D diagnostic trouble code indicates that the Turbocharger/Supercharger Boost Control 'A' Temperature is Too High. Common causes include Malfunctioning boost control solenoid, Clogged air filter, Leaking or damaged intercooler. 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 indicates Turbocharger/Supercharger Boost Control 'A' Temperature Too High.
Common causes
Common causes include Malfunctioning boost control solenoid, Clogged air filter, Leaking or damaged intercooler.
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 Description

The P138D diagnostic trouble code indicates that the Turbocharger/Supercharger Boost Control 'A' Temperature is Too High. This code is typically found in vehicles equipped with turbochargers or superchargers, which are components that increase the engine's power output by forcing more air into the combustion chamber. The boost control system regulates the amount of boost pressure generated by the turbocharger or supercharger to optimize performance and fuel efficiency.

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

Common Causes of P138D

  1. Malfunctioning boost control solenoid
  2. Clogged air filter
  3. Leaking or damaged intercooler
  4. Faulty wastegate
  5. Restricted exhaust system

Symptoms of P138D

  1. Loss of engine power
  2. Reduced fuel efficiency
  3. Engine overheating
  4. Illuminated check engine light
  5. Limp mode activation

How to Fix P138D

  1. Diagnose the specific cause of the high temperature in the boost control system using a scan tool to retrieve the fault codes and perform a visual inspection of the turbocharger/supercharger components.
  2. Replace the malfunctioning boost control solenoid, if necessary, to ensure proper regulation of boost pressure.
  3. Clean or replace the clogged air filter to improve airflow to the turbocharger/supercharger system.
  4. Repair or replace any leaking or damaged intercooler components to prevent loss of boost pressure.
  5. Inspect and replace the faulty wastegate or repair any restrictions in the exhaust system to ensure proper operation of the turbocharger/supercharger system.

Cost to Fix P138D

The typical repair costs for addressing the P138D code related to Turbocharger/Supercharger Boost Control 'A' Temperature Too High can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the cost of parts for this repair can range from $200 to $800, while labor costs can range from $200 to $500. Overall, the total repair cost can be estimated to be between $400 and $1300. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates and diagnostic time can vary based on location and the shop's rates.

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Code P138D Information for Specific Makes

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

1. What are the common symptoms of OBDII code P138D?

- Common symptoms include reduced engine performance, excessive exhaust smoke, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code P138D?

- The code P138D can be triggered by issues such as a faulty turbocharger/supercharger, a malfunctioning boost control system, or restricted intake/exhaust flow.

3. How can I diagnose the cause of OBDII code P138D?

- Diagnosis typically involves inspecting the turbocharger, boost control system, and related components for any visible damage or malfunctions. A professional scan tool can help pinpoint the exact issue.

4. Can driving with OBDII code P138D cause further damage to the vehicle?

- Continuing to drive with this code may potentially lead to further damage to the turbocharger, engine components, or catalytic converter due to increased temperature and stress.

5. How can I repair OBDII code P138D?

- Repair may involve replacing a faulty turbocharger/supercharger, repairing or replacing the boost control system components, or addressing any intake/exhaust restrictions.

6. Are there any maintenance tips to prevent OBDII code P138D from occurring?

- Regular maintenance of the turbocharger, boost control system, and engine components can help prevent issues that may trigger the P138D trouble code.

7. Can a DIY enthusiast fix OBDII code P138D at home?

- While some basic inspections and maintenance tasks can be done at home, diagnosing and repairing the root cause of P138D may require professional expertise and specialized tools.

8. How critical is it to address OBDII code P138D promptly?

- It is important to address this code promptly to prevent potential engine damage, ensure optimal performance, and maintain fuel efficiency.

9. Can a simple reset of the OBDII system clear code P138D?

- A simple reset may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle.

10. Is it recommended to seek professional help for OBDII code P138D?

- Due to the complexity of turbocharger and boost control systems, seeking help from a qualified mechanic or technician is recommended to accurately diagnose and repair the issue causing code P138D.

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