AutoCodes – Ford – P138B Ford

P138B Ford Code - Glow Plug Module System Voltage

Quick Answer

The Engine Control Module (ECM) monitors the Glow Plug Control Module. Common causes include Faulty Glow Plug Control Module, Glow Plug Control Module harness is open or shorted, Glow Plug Control Module 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: P138B Ford indicates Glow Plug Module System Voltage.
Common causes: Common causes include Faulty Glow Plug Control Module, Glow Plug Control Module harness is open or shorted, Glow Plug Control Module 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 11,106

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 P138B Ford Description

The Engine Control Module (ECM) monitors the Glow Plug Control Module. The ECM sets the OBDII code when Glow Plug Control Module is not working properly.

OBDII Code P138B Ford - Glow Plug Module System Voltage - AutoCodes.com — P138B Ford Code - Glow Plug Module System Voltage

What does this mean?

What are the Possible Causes of the DTC P138B Ford?

Faulty Glow Plug Control Module
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P138B 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 P138B 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.

Need more information about the P138B Ford code?

Need more information on how to fix the P138B Ford code? Get Access to Factory Service Manuals

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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 P138B Ford Code

1. What are the common symptoms of OBDII code P138B Ford related to the Glow Plug Module System Voltage?

The common symptoms include hard starting, rough idle, decreased fuel efficiency, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P138B Ford indicating issues with the Glow Plug Module System Voltage?

Possible causes may include a faulty glow plug module, damaged wiring or connectors, a weak battery, or issues with the vehicle's electrical system.

3. How can I diagnose the OBDII code P138B Ford related to the Glow Plug Module System Voltage?

Diagnosis typically involves checking the glow plug module and related components for proper functioning, inspecting wiring for any damage or loose connections, and testing the vehicle's battery and charging system.

4. Can I still drive my vehicle with OBDII code P138B Ford present?

It is not recommended to drive your vehicle with this code present, as it can lead to potential starting and performance issues. It is best to address the underlying problem as soon as possible.

5. How can I repair OBDII code P138B Ford associated with the Glow Plug Module System Voltage?

Repair may involve replacing the glow plug module, repairing or replacing damaged wiring or connectors, ensuring the battery is in good condition, and addressing any other electrical issues in the system.

6. Are there any precautions to take when working on the Glow Plug Module System related to OBDII code P138B Ford?

It is important to disconnect the vehicle's battery before working on any electrical components to prevent damage and ensure safety. Additionally, follow proper procedures outlined in the vehicle's service manual.

7. Can a DIY enthusiast fix OBDII code P138B Ford on their own?

Depending on their skill level and access to tools, a DIY enthusiast may be able to address this code by following proper diagnostic and repair procedures. However, seeking professional help is recommended for complex electrical issues.

8. What is the typical cost to repair OBDII code P138B Ford associated with the Glow Plug Module System Voltage?

The cost of repair can vary depending on the extent of the issue, parts needed, labor rates, and whether the repair is done at a dealership or an independent mechanic. It is advisable to obtain quotes from different sources.

9. Will resetting the OBDII system clear the P138B Ford code related to the Glow Plug Module System Voltage?

Resetting the OBDII system may temporarily clear the code, but it is likely to reappear if the underlying issue is not addressed. It is best to diagnose and repair the problem to prevent further issues.

10. How important is it to address OBDII code P138B Ford indicating problems with the Glow Plug Module System Voltage promptly?

It is crucial to address this code promptly to prevent potential starting issues, performance problems, and further damage to the vehicle's electrical system. Ignoring the code may lead to more significant and costly repairs in the future.