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Engine-Codes – Generic – B3884

B3884 Code - Center High Mounted Stop Lamp Circuit

Quick Answer

The B3884 diagnostic trouble code (DTC) relates to the center high mounted stop lamp circuit in a vehicle. Common causes include Faulty center high mounted stop lamp bulb, Damaged wiring harness leading to the center brake light, Blown fuse in the brake light 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 indicates Center High Mounted Stop Lamp Circuit.
Common causes
Common causes include Faulty center high mounted stop lamp bulb, Damaged wiring harness leading to the center brake light, Blown fuse in the brake light 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 15, 2024
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Code B3884 Description

The B3884 diagnostic trouble code (DTC) relates to the center high mounted stop lamp circuit in a vehicle. This code indicates that there is a malfunction in the circuit responsible for the center brake light located at the rear of the vehicle, typically mounted on the rear windshield or above the rear window. The center high mounted stop lamp is an important safety feature that alerts drivers behind you when you are braking, especially in low visibility conditions.

OBDII Code B3884 - Center High Mounted Stop Lamp Circuit
B3884 Code - Center High Mounted Stop Lamp Circuit

Common Causes of B3884

  1. Faulty center high mounted stop lamp bulb
  2. Damaged wiring harness leading to the center brake light
  3. Blown fuse in the brake light circuit
  4. Malfunctioning brake light switch

Symptoms of B3884

  1. Center high mounted stop lamp not illuminating when braking
  2. Warning light on the dashboard indicating a brake light malfunction
  3. Vehicle failing state inspection due to non-functional center brake light
  4. Other brake lights functioning properly while the center high mounted stop lamp remains off

How to Fix B3884

  1. Begin by inspecting the center high mounted stop lamp bulb to ensure it is not burnt out. Replace the bulb if necessary.
  2. Check the wiring harness connected to the center brake light for any visible damage or loose connections. Repair or replace the wiring as needed.
  3. Test the brake light fuse with a multimeter to determine if it has blown. Replace the fuse if it is faulty.
  4. Verify the functionality of the brake light switch by testing it with a multimeter or by consulting the vehicle's service manual. Replace the switch if it is not working properly.
  5. After completing the repairs, test the center high mounted stop lamp to ensure it illuminates correctly when the brakes are applied.

Cost to Fix B3884

The typical repair costs for addressing the B3884 code can vary depending on the specific cause of the issue. In general, replacing a center high mounted stop lamp bulb can cost between $10 and $20, while repairing or replacing a damaged wiring harness may range from $50 to $200. A blown fuse replacement typically costs around $5 to $10, and a brake light switch replacement can range from $50 to $100. Labor costs at auto repair shops can vary, with hourly rates typically falling between $80 and $150. It is recommended to consult with local repair shops for a more accurate estimate based on your vehicle make and model.

What does this mean?

Tech Notes for B3884

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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Code B3884 Information for Specific Makes

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 Code

1. What does OBDII code B3884 mean?

Code B3884 indicates an issue with the Center High Mounted Stop Lamp (CHMSL) circuit, which may involve a malfunction in the wiring, bulb, or control module related to the third brake light.

2. What are the symptoms of code B3884?

Common symptoms include the center high-mounted stop lamp not illuminating when the brakes are applied or intermittent operation of the lamp.

3. What causes the B3884 code to appear?

The code can be caused by a burnt-out bulb, damaged wiring, corroded connectors, a faulty brake light switch, or a malfunctioning control module.

4. How do I diagnose the B3884 code?

Start by inspecting the center brake light bulb for damage, checking the wiring and connectors for signs of corrosion or breaks, and testing the brake light switch for proper operation.

5. Can I still drive with a B3884 code?

Yes, you can drive with this code, but it’s not recommended as the center brake light is a safety feature, and its malfunction could increase the risk of accidents.

6. How is the B3884 code repaired?

Repairs may involve replacing the center brake light bulb, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the brake light switch or control module.

7. How much does it cost to fix a B3884 code?

The repair cost varies depending on the root cause. Replacing a bulb may cost $10-$50, while wiring or module repairs may cost $100-$500 or more.

8. Can a blown fuse cause the B3884 code?

Yes, a blown fuse related to the CHMSL circuit can cause this code. Check the vehicle’s fuse box and replace any blown fuses.

9. Will clearing the code fix the problem?

Clearing the code without addressing the underlying issue will not fix the problem. The code will likely return until the cause is resolved.

10. Is the B3884 code specific to any vehicle make or model?

No, the B3884 code is a generic OBDII code and can appear on various vehicle makes and models with a center high-mounted stop lamp. However, troubleshooting steps may differ slightly depending on the vehicle.

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