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Engine-Codes – GMC – B3884 2015 GMC Sierra

B3884 2015 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

Quick Answer

The B3884 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Center High Mounted Stop Lamp (CHMSL) circuit. Common causes include Burnt out CHMSL bulb, Damaged wiring or connectors in the CHMSL circuit, Faulty CHMSL control module. 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
B3884 2015 GMC Sierra indicates Center High Mounted Stop Lamp Circuit.
Common causes
Common causes include Burnt out CHMSL bulb, Damaged wiring or connectors in the CHMSL circuit, Faulty CHMSL control module.
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 13, 2024
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Code B3884 2015 GMC Sierra Description

The B3884 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Center High Mounted Stop Lamp (CHMSL) circuit. This code indicates a malfunction in the circuit responsible for the operation of the CHMSL, also known as the third brake light. The CHMSL is a crucial safety feature that alerts drivers behind you when you apply the brakes, especially in low visibility conditions. When this circuit fails, it can compromise the visibility of your braking intentions to other drivers, increasing the risk of rear-end collisions.

OBDII Code B3884 2015 GMC Sierra - Center High Mounted Stop Lamp Circuit
B3884 2015 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

Common Causes of B3884 2015 GMC Sierra

  1. Burnt out CHMSL bulb.
  2. Damaged wiring or connectors in the CHMSL circuit.
  3. Faulty CHMSL control module.
  4. Corrosion in the CHMSL circuit.
  5. Poor electrical connection in the CHMSL circuit.

Symptoms of B3884 2015 GMC Sierra

  1. CHMSL not illuminating when the brakes are applied.
  2. CHMSL flickering or flashing intermittently.
  3. Dashboard warning light indicating a brake light malfunction.
  4. Vehicle displaying the B3884 DTC in the diagnostic system.

How to Fix B3884 2015 GMC Sierra

  1. Begin by visually inspecting the CHMSL bulb to check for any signs of damage or burnout. Replace the bulb if necessary.
  2. Inspect the wiring harness and connectors in the CHMSL circuit for any visible damage, corrosion, or loose connections. Repair or replace as needed.
  3. Use a multimeter to test the continuity of the wiring in the CHMSL circuit to identify any open or short circuits.
  4. Check the CHMSL control module for proper functioning and replace if found to be faulty.
  5. Clear the DTC from the vehicle's diagnostic system after completing the repairs and test the CHMSL to ensure proper operation.

Cost to Fix B3884 2015 GMC Sierra

The cost of repairing a B3884 DTC related to the Center High Mounted Stop Lamp Circuit in a 2015 GMC Sierra can vary depending on the specific cause of the issue. On average, the cost of parts for this repair may range from $20 to $100, while labor costs can range from $80 to $150 per hour. Overall, the total repair cost may fall between $100 and $300, excluding any diagnostic fees or additional charges. It is recommended to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on your vehicle's specific needs and location.

What does this mean?

Tech Notes for B3884 2015 GMC Sierra

B3884:01 Center High Mounted Stop Lamp Circuit Short to Battery

B3884:02 Center High Mounted Stop Lamp Circuit Short to Ground

B3884:04 Center High Mounted Stop Lamp Circuit Open

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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 B3884 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B3884 in a 2015 GMC Sierra related to the Center High Mounted Stop Lamp Circuit?

The common symptoms include the center high-mounted stop lamp (CHMSL) not functioning properly, the CHMSL staying on constantly, or the CHMSL flickering intermittently.

2. What are some possible causes of OBDII code B3884 in a 2015 GMC Sierra?

Possible causes include a faulty CHMSL bulb, a damaged wiring harness, a malfunctioning CHMSL control module, or a problem with the CHMSL switch.

3. How can I diagnose the issue related to OBDII code B3884 in my 2015 GMC Sierra?

You can start by visually inspecting the CHMSL bulb and its connections, checking the wiring for any signs of damage, testing the CHMSL control module, and verifying the functionality of the CHMSL switch.

4. Can I repair OBDII code B3884 in my 2015 GMC Sierra on my own?

Depending on the underlying cause, you may be able to repair the issue on your own if you have the necessary tools and expertise. Simple fixes like replacing a faulty bulb or repairing a damaged wire may be done at home, while more complex issues might require professional assistance.

5. Is it safe to continue driving my 2015 GMC Sierra with OBDII code B3884 related to the Center High Mounted Stop Lamp Circuit?

It is not recommended to drive your vehicle with a malfunctioning CHMSL, as it can compromise safety by reducing the visibility of your braking intentions to other drivers on the road.

6. How much does it typically cost to repair OBDII code B3884 in a 2015 GMC Sierra at a professional auto repair shop?

The cost of repairing OBDII code B3884 can vary depending on the exact cause of the issue, but you can expect to pay anywhere from $100 to $300 for parts and labor at a professional auto repair shop.

7. Can resetting the OBDII system clear the B3884 trouble code in a 2015 GMC Sierra?

Resetting the OBDII system may temporarily clear the trouble code, but if the underlying issue causing the B3884 code is not addressed and fixed, the code is likely to reappear.

8. Are there any common recalls or technical service bulletins related to OBDII code B3884 in a 2015 GMC Sierra?

It's recommended to check with a GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to this specific OBDII code for your vehicle.

9. Can extreme weather conditions or water damage cause OBDII code B3884 in a 2015 GMC Sierra?

Yes, extreme weather conditions or water damage can potentially lead to issues with the Center High Mounted Stop Lamp Circuit, triggering the B3884 trouble code in your GMC Sierra.

10. How often should I inspect the CHMSL and associated components in my 2015 GMC Sierra to prevent OBDII code B3884 from occurring?

It's a good practice to inspect the CHMSL, bulbs, wiring, and control module during routine vehicle maintenance checks or whenever you notice any irregularities in the CHMSL's operation to catch and address potential issues early on.

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