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Engine-Codes – GMC – B3884 2018 GMC Sierra

B3884 2018 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

Quick Answer

The B3884 diagnostic trouble code (DTC) on a 2018 GMC Sierra relates to the Center High Mounted Stop Lamp (CHMSL) circuit. Common causes include Faulty CHMSL bulb, Damaged wiring harness leading to the CHMSL, Blown fuse in the CHMSL circuit. 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 2018 GMC Sierra indicates Center High Mounted Stop Lamp Circuit.
Common causes
Common causes include Faulty CHMSL bulb, Damaged wiring harness leading to the CHMSL, Blown fuse in the CHMSL circuit.
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 17, 2024
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Code B3884 2018 GMC Sierra Description

The B3884 diagnostic trouble code (DTC) on a 2018 GMC Sierra relates to the Center High Mounted Stop Lamp (CHMSL) circuit. This code indicates that there is a malfunction in the circuit responsible for the CHMSL, which is the third brake light mounted at the top of the vehicle's rear window. The CHMSL is a crucial safety feature that alerts drivers behind you when you are braking, especially in high-traffic situations or adverse weather conditions.

OBDII Code B3884 2018 GMC Sierra - Center High Mounted Stop Lamp Circuit
B3884 2018 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

Common Causes of B3884 2018 GMC Sierra

  1. Faulty CHMSL bulb
  2. Damaged wiring harness leading to the CHMSL
  3. Blown fuse in the CHMSL circuit
  4. Malfunctioning CHMSL module
  5. Corrosion or loose connections in the CHMSL circuit

Symptoms of B3884 2018 GMC Sierra

  1. CHMSL not illuminating when braking
  2. CHMSL flickering or flashing intermittently
  3. Dashboard warning light indicating an issue with the CHMSL
  4. Vehicle failing state inspection due to CHMSL malfunction

How to Fix B3884 2018 GMC Sierra

  1. Begin by inspecting the CHMSL bulb to ensure it is not burnt out. Replace the bulb if necessary.
  2. Check the wiring harness connected to the CHMSL for any visible damage or corrosion. Repair or replace the wiring as needed.
  3. Inspect the fuse related to the CHMSL circuit and replace it if it is blown.
  4. Test the CHMSL module for proper functionality and replace it if it is faulty.
  5. Clear the DTC from the vehicle's computer system using a diagnostic scanner after completing the repairs.

Cost to Fix B3884 2018 GMC Sierra

The cost of repairing a B3884 DTC related to the CHMSL circuit on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a CHMSL bulb can cost between $5 to $20, while repairing or replacing a damaged wiring harness may range from $50 to $200. If the issue is related to a faulty CHMSL module, the cost can be higher, typically ranging from $100 to $300. Labor costs for these repairs can vary, with hourly rates typically falling between $80 to $150. It is advisable to consult with a trusted auto repair shop for a more accurate cost estimate based on your specific situation.

What does this mean?

Tech Notes for B3884 2018 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 2018 GMC Sierra Code

1. What does OBDII code B3884 for a 2018 GMC Sierra mean?

Code B3884 indicates a problem with the Center High Mounted Stop Lamp Circuit.

2. What are the common symptoms of OBDII code B3884 in a 2018 GMC Sierra?

Common symptoms include the center high mounted stop lamp not functioning properly or not illuminating at all.

3. What are the possible causes of OBDII code B3884 in a 2018 GMC Sierra?

Potential causes include a faulty center high mounted stop lamp, damaged wiring or connectors, or a problem with the stop lamp circuit.

4. How can I diagnose the issue related to OBDII code B3884 in my 2018 GMC Sierra?

You can start by visually inspecting the center high mounted stop lamp, checking the wiring and connectors for any damage, and using a multimeter to test the circuit for continuity.

5. Can I still drive my 2018 GMC Sierra with OBDII code B3884 present?

While the vehicle may still be drivable, it is important to address the issue promptly to ensure the center high mounted stop lamp functions correctly for safety reasons.

6. How can I repair OBDII code B3884 in a 2018 GMC Sierra?

Repair options include replacing the faulty center high mounted stop lamp, repairing any damaged wiring or connectors, or addressing any issues with the stop lamp circuit.

7. Can I reset OBDII code B3884 in my 2018 GMC Sierra without fixing the underlying issue?

Resetting the code without fixing the problem may temporarily turn off the check engine light, but the issue will likely resurface until the root cause is addressed.

8. Can a DIY enthusiast fix OBDII code B3884 in a 2018 GMC Sierra?

DIY enthusiasts with knowledge of automotive electrical systems may be able to diagnose and repair the issue, but if in doubt, it is recommended to seek professional help.

9. How much does it typically cost to repair OBDII code B3884 in a 2018 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue, but it may include the price of a new center high mounted stop lamp, wiring repairs, and labor costs.

10. Is OBDII code B3884 a common problem in 2018 GMC Sierra vehicles?

While the frequency of this specific code may vary, issues related to the center high mounted stop lamp circuit can occur in any vehicle, including the 2018 GMC Sierra.

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