AutoCodes – GMC – B263A 2017 GMC Sierra

B263A 2017 GMC Sierra Code - Exterior Illumination Lamp Circuit

Quick Answer

The Body Control Module (BCM) supplies battery voltage to each exterior door handle LED backlighting, the LED lighting located under each outside rearview mirror for approach lighting, and both running board steps courtesy lamps when equipped. Common causes include Faulty Exterior Illumination Lamp, Exterior Illumination Lamp harness is open or shorted, Exterior Illumination 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: B263A 2017 GMC Sierra indicates Exterior Illumination Lamp Circuit.
Common causes: Common causes include Faulty Exterior Illumination Lamp, Exterior Illumination Lamp harness is open or shorted, Exterior Illumination 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 151

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 May 29, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B263A 2017 GMC Sierra Description

The Body Control Module (BCM) supplies battery voltage to each exterior door handle LED backlighting, the LED lighting located under each outside rearview mirror for approach lighting, and both running board steps courtesy lamps when equipped. When the keyless entry transmitter is operated to the lock/unlock functions the LED lighting located under each outside rearview mirror, exterior door handles, and both running board steps are commanded ON for approach lighting. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a problem in the exterior courtesy lamps control circuit.

OBDII Code B263A 2017 GMC Sierra - Exterior Illumination Lamp Circuit - AutoCodes.com — B263A 2017 GMC Sierra Code - Exterior Illumination Lamp Circuit

What does this mean?

What are the Possible Causes of the DTC B263A 2017 GMC Sierra?

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

How to Fix the DTC B263A 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

B263A:02 Exterior Illumination Lamp Circuit Short to Ground
B263A:04 Exterior Illumination Lamp Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B263A 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.

Need more information about the B263A 2017 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 B263A 2017 GMC Sierra Code

1. What is OBDII code B263A on a 2017 GMC Sierra?

This code refers to a fault in the Exterior Illumination Lamp Circuit of the vehicle.

2. What are common symptoms of OBDII code B263A on a 2017 GMC Sierra?

Common symptoms include exterior lights not functioning properly, such as the headlights, taillights, or turn signals.

3. What are possible causes of OBDII code B263A on a 2017 GMC Sierra?

Potential causes include faulty wiring or connectors in the exterior illumination lamp circuit, a defective lamp control module, or a malfunctioning light switch.

4. How can I diagnose OBDII code B263A on my 2017 GMC Sierra?

To diagnose this code, you can use an OBDII scanner to read the trouble codes, visually inspect the exterior lamps for any visible damage, and check the wiring and connectors for any signs of wear or corrosion.

5. How can I repair OBDII code B263A on a 2017 GMC Sierra?

Repairing this code may involve replacing a faulty lamp control module, repairing damaged wiring or connectors, or replacing a malfunctioning light switch.

6. Can I drive my 2017 GMC Sierra with OBDII code B263A?

It is not recommended to drive the vehicle with this code active, as it may affect the proper functioning of the exterior lights, compromising safety.

7. How much does it cost to repair OBDII code B263A on a 2017 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can I reset OBDII code B263A on my 2017 GMC Sierra without fixing the issue?

While you can clear the code with an OBDII scanner, it is not recommended to do so without addressing the underlying problem, as the issue will likely persist and potentially worsen over time.

9. Is OBDII code B263A a common problem in 2017 GMC Sierra vehicles?

While it may not be extremely common, issues with the exterior illumination lamp circuit can occur in various vehicles, including the 2017 GMC Sierra.

10. Can a DIY enthusiast repair OBDII code B263A on a 2017 GMC Sierra?

Depending on your skill level and experience with automotive repairs, you may be able to diagnose and repair the issue yourself, especially if it involves simple tasks like replacing a light bulb or a fuse. However, more complex issues may require professional assistance.