AutoCodes – GMC – B3884 2015 GMC Sierra

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

Quick Answer

The brake pedal position sensor is used to sense the action of the driver's application of the brake pedal. Common causes include Faulty Center High Mounted Stop Lamp, Center High Mounted Stop Lamp harness is open or shorted, Center High Mounted Stop Lamp circuit poor electrical connection. 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 Faulty Center High Mounted Stop Lamp, Center High Mounted Stop Lamp harness is open or shorted, Center High Mounted Stop Lamp circuit poor electrical connection.
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.

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Code Popularity 155

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 16, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3884 2015 GMC Sierra Description

The brake pedal position sensor is used to sense the action of the driver's application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The Body Control Module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM energizes the stop lamp relay by applying a voltage to the stop lamp relay control circuit. When the stop lamp relay is energized, the relay switch contacts close, and battery voltage is applied to the Center High Mounted Stop Lamp (CHMSL) control circuit which illuminates the CHMSL. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a malfunction in the stop lamp relay control circuit.

OBDII Code B3884 2015 GMC Sierra - Center High Mounted Stop Lamp Circuit - AutoCodes.com — B3884 2015 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

What does this mean?

What are the Possible Causes of the DTC B3884 2015 GMC Sierra?

Faulty Center High Mounted Stop Lamp
Center High Mounted Stop Lamp harness is open or shorted
Center High Mounted Stop Lamp circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3884 2015 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3884 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B3884 2015 GMC Sierra code?

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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.