AutoCodes – GMC – B3138 GMC

B3138 GMC Code - All Door Lock Circuit High

Quick Answer

The outputs to the door lock actuators are controlled by the Body Control Module (BCM). Common causes include Faulty Inoperative Door Lock Actuator, Inoperative Door Lock Actuator harness is open or shorted, Inoperative Door Lock Actuator 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: B3138 GMC indicates All Door Lock Circuit High.
Common causes: Common causes include Faulty Inoperative Door Lock Actuator, Inoperative Door Lock Actuator harness is open or shorted, Inoperative Door Lock Actuator 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 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 Mar 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3138 GMC Description

The outputs to the door lock actuators are controlled by the Body Control Module (BCM). When the BCM receives a lock input from a door lock switch, or a keyless entry transmitter, it applies battery positive voltage to the door lock actuator lock control circuit, a ground to the door lock actuator unlock control, and the driver door lock actuator unlock control circuits. When the BCM receives an unlock input from a door lock switch, it applies battery positive voltage to the door lock actuator unlock control, the driver door lock actuator unlock control circuits, and a ground to the door lock actuator lock control circuit. When the BCM receives an single Unlock input from a keyless entry transmitter, it applies battery positive voltage to the driver door lock actuator unlock control circuit and a ground to the door lock actuator lock control circuit to unlock the driver door. A second Unlock input from the transmitter applies battery positive voltage to the door lock actuator unlock control circuit, and a ground to the door lock actuator lock control circuit to unlock the passenger doors.

OBDII Code B3138 GMC - All Door Lock Circuit High - AutoCodes.com — B3138 GMC Code - All Door Lock Circuit High

What does this mean?

What are the Possible Causes of the DTC B3138 GMC?

Faulty Inoperative Door Lock Actuator
Inoperative Door Lock Actuator harness is open or shorted
Inoperative Door Lock Actuator circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3138 GMC?

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 B3138 GMC 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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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 B3138 GMC Code

1. What are common symptoms of the OBDII code B3138 GMC "All Door Lock Circuit High"?

- Common symptoms include all door locks not functioning properly, doors not locking or unlocking, and potential issues with the vehicle's keyless entry system.

2. What are possible causes of the B3138 GMC code?

- Possible causes may include a faulty door lock actuator, issues with the door lock switch, damaged wiring or connectors in the door lock circuit, or a malfunctioning body control module.

3. How can I diagnose the source of the B3138 GMC code?

- To diagnose the issue, you can start by visually inspecting the door lock components and wiring for any visible damage. Using a multimeter to test the continuity of the circuit and checking for any loose connections can help pinpoint the problem.

4. What are some repair tips for addressing the B3138 GMC code?

- Repair tips may include replacing a faulty door lock actuator, repairing damaged wiring or connectors, resetting the body control module, or recalibrating the keyless entry system.

5. Can I drive my vehicle with the B3138 GMC trouble code?

- It is generally safe to drive the vehicle with this code, but you may experience inconvenience due to door lock issues. It is recommended to address the problem promptly to ensure proper functionality and security.

6. Will resetting the trouble codes clear the B3138 GMC code?

- Resetting the trouble codes may temporarily clear the B3138 code, but if the underlying issue is not fixed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

7. Do I need special tools to fix the B3138 GMC code?

- While specialized tools may be helpful for diagnosis, basic tools like a multimeter, screwdrivers, and wiring repair tools are often sufficient for addressing the B3138 code.

8. Can extreme weather conditions cause the B3138 GMC trouble code?

- Extreme weather conditions can potentially affect the door lock circuit and components, leading to the B3138 code. It is advisable to keep the vehicle protected from harsh weather and address any issues promptly.

9. How long does it take to repair the B3138 GMC code?

- The repair time for the B3138 code can vary depending on the specific cause of the issue. Simple fixes like replacing a door lock actuator may take a few hours, while more complex wiring repairs could take longer.

10. Is the B3138 GMC code a common issue in GMC vehicles?

- The B3138 code related to the all door lock circuit high is a relatively common issue in GMC vehicles, particularly in models with keyless entry systems and power door locks. Regular maintenance and prompt repairs can help prevent this problem.