AutoCodes – GMC – B3884 2017 GMC Sierra

B3884 2017 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 2017 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 195

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 2017 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 2017 GMC Sierra - Center High Mounted Stop Lamp Circuit - AutoCodes.com — B3884 2017 GMC Sierra Code - Center High Mounted Stop Lamp Circuit

What does this mean?

What are the Possible Causes of the DTC B3884 2017 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 2017 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 2017 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.

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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.