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B3884 2017 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

Quick Answer

The B3884 diagnostic trouble code (DTC) for the 2017 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 2017 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 16, 2024
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Code B3884 2017 GMC Sierra Description

The B3884 diagnostic trouble code (DTC) for the 2017 GMC Sierra relates to the Center High Mounted Stop Lamp (CHMSL) circuit. The CHMSL is the third brake light mounted at the top of the rear window or on the roof of the vehicle. This code indicates a malfunction in the circuit that controls the CHMSL, which can affect the vehicle's safety and compliance with road regulations.

OBDII Code B3884 2017 GMC Sierra - Center High Mounted Stop Lamp Circuit
B3884 2017 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

Common Causes of B3884 2017 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 2017 GMC Sierra

  1. CHMSL not illuminating when braking
  2. Warning light on the dashboard indicating a brake light issue
  3. Flickering or dim CHMSL light
  4. CHMSL light staying on constantly
  5. Vehicle failing state inspections due to CHMSL malfunction

How to Fix B3884 2017 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 connected to the CHMSL for any visible damage, corrosion, or loose connections. Repair or replace the wiring as needed.
  3. Check the fuse associated with the CHMSL circuit and replace it if blown.
  4. Test the CHMSL module for proper functionality and replace it if found to be faulty.
  5. Clear the DTC with a diagnostic scanner after completing the repairs and test the CHMSL to ensure it is functioning correctly.

Cost to Fix B3884 2017 GMC Sierra

The cost of repairing the Center High Mounted Stop Lamp circuit can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for this repair can range from $20 to $100, while labor costs can range from $80 to $150 per hour. Therefore, the total cost of repairing the CHMSL circuit could be anywhere from $100 to $400 or more. It is recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for B3884 2017 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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B3884 in a 2017 GMC Sierra related to the Center High Mounted Stop Lamp Circuit?

- The common symptoms include the center high-mounted stop lamp not functioning properly or remaining illuminated even when the brake pedal is not pressed.

2. What could be causing OBDII code B3884 in a 2017 GMC Sierra?

- Possible causes of this code may include a faulty center high-mounted stop lamp assembly, wiring issues, or a malfunctioning brake light switch.

3. How can I diagnose the Center High Mounted Stop Lamp Circuit issue in my 2017 GMC Sierra?

- You can start by visually inspecting the center high-mounted stop lamp for any visible damage or loose connections. Testing the wiring and the brake light switch for continuity may also help pinpoint the issue.

4. Can a DIY enthusiast repair OBDII code B3884 in a 2017 GMC Sierra?

- Depending on the specific cause, some repairs related to the Center High Mounted Stop Lamp Circuit issue can be tackled by DIY enthusiasts, such as replacing the center high-mounted stop lamp assembly or fixing simple wiring problems.

5. Is it important to address OBDII code B3884 promptly in a 2017 GMC Sierra?

- Yes, it is crucial to address this code promptly as it indicates a potential issue with the center high-mounted stop lamp, which plays a significant role in vehicle safety by alerting other drivers when you apply the brakes.

6. Are there any safety concerns associated with OBDII code B3884 in a 2017 GMC Sierra?

- Yes, driving with a malfunctioning center high-mounted stop lamp can pose safety risks as it reduces the visibility of your vehicle to other drivers, especially when braking.

7. How much does it typically cost to repair OBDII code B3884 in a 2017 GMC Sierra?

- The cost of repairing OBDII code B3884 can vary depending on the exact cause of the issue. Simple fixes like replacing a bulb may be inexpensive, while more complex problems like wiring issues can be costly.

8. Can OBDII code B3884 in a 2017 GMC Sierra cause other warning lights to illuminate on the dashboard?

- While B3884 specifically relates to the Center High Mounted Stop Lamp Circuit, it may trigger other warning lights related to the vehicle's electrical system or brake system if left unresolved.

9. What are some preventive measures to avoid OBDII code B3884 in a 2017 GMC Sierra?

- Regularly inspecting the center high-mounted stop lamp for any signs of damage or wear, as well as ensuring proper maintenance of the brake light system, can help prevent issues leading to this OBDII code.

10. Can resetting the OBDII system clear OBDII code B3884 in a 2017 GMC Sierra?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the Center High Mounted Stop Lamp Circuit is not addressed, the code is likely to reappear.

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