AutoCodes – GMC – B3881 GMC

B3881 GMC Code - Left Tail Lamp Circuit Short to Ground

Quick Answer

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. Common causes include Faulty Left Tail Lamp, Left Tail Lamp harness is open or shorted, Left Tail 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: B3881 GMC indicates Left Tail Lamp Circuit Short to Ground.
Common causes: Common causes include Faulty Left Tail Lamp, Left Tail Lamp harness is open or shorted, Left Tail 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 682

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 Mar 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3881 GMC Description

The brake pedal position sensor is used to sense the action of the driver 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 will apply battery voltage to the left and right stop lamp control circuits as well as the center high mounted stop lamp relay control circuit illuminating the left and right stop lamps and the center high mounted stop lamp. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the left stop lamp control circuit.

OBDII Code B3881 GMC - Left Tail Lamp Circuit Short to Ground - AutoCodes.com — B3881 GMC Code - Left Tail Lamp Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B3881 GMC?

Faulty Left Tail Lamp
Left Tail Lamp harness is open or shorted
Left Tail Lamp circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3881 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3881 GMC 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 B3881 GMC Code

1. What are the common symptoms of OBDII code B3881 GMC (Left Tail Lamp Circuit Short to Ground)?

The common symptoms include a non-functioning left tail lamp, a warning light on the dashboard, and potential issues with turn signal operation.

2. What are the possible causes of OBDII code B3881 GMC?

Possible causes may include a short circuit in the wiring, a faulty tail lamp assembly, a damaged bulb socket, or a problem with the vehicle's electrical system.

3. How can I diagnose the cause of the B3881 code on my GMC vehicle?

To diagnose the issue, you can start by visually inspecting the left tail lamp assembly, checking the wiring for any signs of damage, testing the bulb socket, and using a multimeter to check for continuity and shorts in the circuit.

4. What are some tips for repairing OBDII code B3881 GMC?

Repair tips include repairing or replacing damaged wiring, inspecting and replacing the tail lamp assembly if necessary, ensuring a secure connection in the bulb socket, and resetting the trouble code after repairs are completed.

5. Can I drive my GMC vehicle with the B3881 code present?

It is not recommended to drive the vehicle with the B3881 code, as it indicates a potential safety issue with the left tail lamp circuit. Promptly addressing the problem is crucial to ensure proper visibility and signal operation.

6. How much does it typically cost to repair OBDII code B3881 GMC?

The cost of repairs can vary depending on the underlying cause of the code and the extent of the damage. Costs may include parts and labor for repairing or replacing components in the left tail lamp circuit.

7. Will resetting the trouble code make the B3881 GMC code disappear permanently?

Resetting the trouble code may temporarily clear the warning light on the dashboard, but if the underlying issue causing the B3881 code is not addressed, the code is likely to reappear upon further diagnostics or driving.

8. Is it possible to prevent OBDII code B3881 GMC from occurring in the future?

Regular maintenance checks, monitoring the condition of the vehicle's lighting system, and addressing any issues promptly can help prevent the occurrence of the B3881 code related to the left tail lamp circuit.

9. Can a DIY enthusiast repair OBDII code B3881 GMC at home?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair minor issues related to the B3881 code, such as checking and replacing bulbs or fuses. However, more complex issues may require professional assistance.

10. How long does it take to repair OBDII code B3881 GMC?

The repair time for OBDII code B3881 GMC can vary based on the specific cause of the issue and the complexity of the repairs needed. Simple fixes like replacing a bulb may take a short time, while diagnosing and repairing wiring issues could be more time-consuming.