AutoCodes – Generic – P138D

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

Quick Answer

The Powertrain Control Module (PCM) monitors the Turbocharger/Supercharger Boost Control 'A'. Common causes include Faulty Turbocharger/Supercharger Boost Control 'A', Turbocharger/Supercharger Boost Control 'A' harness is open or shorted, Turbocharger/Supercharger Boost Control 'A' 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: P138D indicates Turbocharger/Supercharger Boost Control 'A' Temperature Too High.
Common causes: Common causes include Faulty Turbocharger/Supercharger Boost Control 'A', Turbocharger/Supercharger Boost Control 'A' harness is open or shorted, Turbocharger/Supercharger Boost Control 'A' 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.

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Code Popularity 1,741

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P138D Description

The Powertrain Control Module (PCM) monitors the Turbocharger/Supercharger Boost Control 'A'. The PCM sets the OBDII code when the Turbocharger/Supercharger Boost Control 'A' is not to factory specifications.

OBDII Code P138D - Turbocharger/Supercharger Boost Control 'A' Temperature Too High - AutoCodes.com — P138D Code - Turbocharger/Supercharger Boost Control 'A' Temperature Too High

What does this mean?

What are the Possible Causes of the DTC P138D?

Faulty Turbocharger/Supercharger Boost Control 'A'
Turbocharger/Supercharger Boost Control 'A' harness is open or shorted
Turbocharger/Supercharger Boost Control 'A' circuit poor electrical connection

How to Fix the DTC P138D?

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 P138D 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.

Need more information about the P138D code?

Need more information on how to fix the P138D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P138D code diagnosed by a professional: Find a repair shop in your area

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.