AutoCodes – Generic – B263A

B263A 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 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 1,243

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 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 - Exterior Illumination Lamp Circuit - AutoCodes.com — B263A Code - Exterior Illumination Lamp Circuit

What does this mean?

What are the Possible Causes of the DTC B263A?

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?

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 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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Need Help with the Code?

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Information for Specific Makes

B263A Buick — Exterior Illumination Lamp Circuit
B263A Cadillac — Exterior Illumination Lamp Circuit
B263A Chevrolet — Exterior Illumination Lamp Circuit
B263A GMC — Exterior Illumination Lamp Circuit

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 Code

1. What are common symptoms of OBDII code B263A?

- Common symptoms include malfunctioning exterior lights such as headlights, taillights, or turn signals, flickering lights, or lights not turning on at all.

2. What does OBDII code B263A indicate?

- OBDII code B263A indicates a fault in the exterior illumination lamp circuit of the vehicle.

3. What are the possible causes of OBDII code B263A?

- Possible causes include a faulty bulb, wiring issues, a malfunctioning lamp control module, or a problem with the body control module.

4. How can I diagnose the issue related to OBDII code B263A?

- Diagnose the issue by inspecting the exterior lights, checking the wiring for any damage, testing the bulbs for functionality, and using a diagnostic scanner to read the code.

5. Can I repair OBDII code B263A myself?

- Depending on your skill level and access to tools, you may be able to repair the issue yourself by replacing a faulty bulb, repairing damaged wiring, or resetting the lamp control module.

6. Is it safe to drive with OBDII code B263A active?

- It is not recommended to drive with OBDII code B263A active, as malfunctioning exterior lights can compromise road safety, visibility, and may lead to a potential traffic violation.

7. How much does it typically cost to repair OBDII code B263A?

- The cost of repairing OBDII code B263A can vary depending on the underlying cause, but it may range from a few dollars for a bulb replacement to several hundred dollars for module replacement or complex wiring repairs.

8. Can a loose connection cause OBDII code B263A to trigger?

- Yes, a loose or corroded connection in the exterior illumination lamp circuit can cause OBDII code B263A to trigger due to disrupted power flow to the lights.

9. Will resetting the OBDII code B263A resolve the issue permanently?

- Resetting the code may temporarily turn off the warning light, but if the underlying issue causing OBDII code B263A is not addressed, the code is likely to reappear.

10. How can I prevent OBDII code B263A from recurring?

- Regularly inspect and maintain your vehicle's exterior lights, keep the wiring connections clean and secure, and address any lighting issues promptly to prevent OBDII code B263A from recurring.