Engine-Codes.com
Engine-Codes – Chevrolet – B3884 2018 Chevrolet Silverado

B3884 2018 Chevrolet Silverado Code - Center High Mounted Stop Lamp Circuit

Quick Answer

The B3884 code on a 2018 Chevrolet Silverado indicates a problem with the center high mounted stop lamp (CHMSL) circuit. Common causes include Faulty CHMSL bulb, Damaged wiring or connectors in the CHMSL circuit, Corrosion or loose connections 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 Chevrolet Silverado indicates Center High Mounted Stop Lamp Circuit.
Common causes
Common causes include Faulty CHMSL bulb, Damaged wiring or connectors in the CHMSL circuit, Corrosion or loose connections 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 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B3884 2018 Chevrolet Silverado Description

The B3884 code on a 2018 Chevrolet Silverado indicates a problem with 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 light is an important safety feature as it provides additional visibility to drivers behind you when you apply the brakes.

OBDII Code B3884 2018 Chevrolet Silverado - Center High Mounted Stop Lamp Circuit
B3884 2018 Chevrolet Silverado Code - Center High Mounted Stop Lamp Circuit

Common Causes of B3884 2018 Chevrolet Silverado

  1. Faulty CHMSL bulb.
  2. Damaged wiring or connectors in the CHMSL circuit.
  3. Corrosion or loose connections in the CHMSL circuit.
  4. Failed PCM.
  5. Water intrusion into the CHMSL housing.

Symptoms of B3884 2018 Chevrolet Silverado

  1. CHMSL not illuminating when brakes are applied.
  2. CHMSL flickering or blinking intermittently.
  3. Check engine light illuminated on the dashboard.
  4. Loss of cruise control functionality.
  5. Other brake lights not working properly.

How to Fix B3884 2018 Chevrolet Silverado

  1. Begin by inspecting the CHMSL bulb and replacing it if necessary.
  2. Check the wiring and connectors in the CHMSL circuit for any damage or corrosion. Repair or replace as needed.
  3. Test the CHMSL circuit for continuity using a multimeter to identify any open circuits.
  4. If the issue persists, the PCM may need to be reprogrammed or replaced by a qualified mechanic.
  5. Clear the diagnostic trouble codes from the PCM and test the CHMSL to ensure it is functioning properly.

Cost to Fix B3884 2018 Chevrolet Silverado

The cost of repairing the Center High Mounted Stop Lamp Circuit on a 2018 Chevrolet Silverado can vary depending on the exact cause of the issue and the labor rates in your area. In general, the cost of replacing a CHMSL bulb is relatively low, usually ranging from $10 to $30 for the bulb itself. If the wiring or connectors need to be repaired or replaced, the cost can increase to around $100 to $200. If the PCM needs to be replaced, this can be a more expensive repair, potentially costing $500 to $1000 or more. Labor costs can range from $80 to $150 per hour, so the total repair bill can add up quickly. It's recommended to get a specific quote from a trusted mechanic to determine the exact cost for your vehicle.

What does this mean?

Tech Notes for B3884 2018 Chevrolet Silverado

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

Need more information about the B3884 2018 Chevrolet Silverado code?

Need more information on how to fix the B3884 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3884 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Silverado Code

1. What does the OBDII code B3884 mean on a 2018 Chevrolet Silverado?

The B3884 code indicates an issue with the Center High Mounted Stop Lamp (CHMSL) circuit, such as a fault in the wiring, bulb, or control module.

2. What are the common symptoms of the B3884 code in a 2018 Chevrolet Silverado?

Symptoms may include the center high-mounted stop lamp not working, a warning light on the dashboard, or other brake light issues.

3. What causes the B3884 code to appear on a 2018 Chevrolet Silverado?

Common causes include a burned-out CHMSL bulb, damaged wiring, a faulty lamp assembly, or a malfunctioning Body Control Module (BCM).

4. Can I still drive my 2018 Chevrolet Silverado with the B3884 code?

Yes, but it’s not recommended as the CHMSL is a safety feature for braking visibility, and driving without it may increase the risk of an accident.

5. How do I fix the B3884 code on a 2018 Chevrolet Silverado?

Repairs may involve replacing the CHMSL bulb, fixing damaged wiring, or diagnosing and replacing a faulty BCM if necessary.

6. How do I check for wiring issues in the CHMSL circuit?

Inspect the wiring for visible damage, corrosion, or loose connections, and use a multimeter to verify proper voltage and continuity.

7. Does the B3884 code require reprogramming the Body Control Module (BCM)?

Reprogramming the BCM is not always necessary, but if the module is faulty and replaced, it may need to be reprogrammed by a qualified technician.

8. Can a blown fuse cause the B3884 code on a 2018 Chevrolet Silverado?

Yes, a blown fuse in the brake light or CHMSL circuit can trigger this code. Check and replace any blown fuses as needed.

9. How much does it cost to fix the B3884 code on a 2018 Chevrolet Silverado?

Costs vary depending on the issue, ranging from $10–$20 for a new bulb to several hundred dollars for BCM replacement or wiring repairs.

10. Can a bad CHMSL assembly trigger the B3884 code?

Yes, a faulty CHMSL assembly, such as water intrusion or internal damage, can cause the code to appear and should be replaced if defective.

Discuss the causes and fixes for B3884 2018 Chevrolet Silverado OBDII Code

Submit a New Comment

Code B3884 2018 Chevrolet Silverado comments

No comments found for this page.