AutoCodes – Chevrolet – B256B 2018 Chevrolet Silverado

B256B 2018 Chevrolet Silverado Code - Cargo Lamps Switch Circuit Malfunction

Quick Answer

The cargo lamp relay is always supplied with battery voltage. Common causes include Faulty Cargo Lamps Switch, Cargo Lamps Switch harness is open or shorted, Cargo Lamps Switch 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: B256B 2018 Chevrolet Silverado indicates Cargo Lamps Switch Circuit Malfunction.
Common causes: Common causes include Faulty Cargo Lamps Switch, Cargo Lamps Switch harness is open or shorted, Cargo Lamps Switch 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 238

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 26, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B256B 2018 Chevrolet Silverado Description

The cargo lamp relay is always supplied with battery voltage. The cargo lamp switch signal circuit is grounded momentarily by pressing the cargo lamp switch. The Body Control Module (BCM) energizes the cargo lamp relay by applying ground to the cargo lamp relay control circuit. When the cargo lamp relay is energized, the relay switch contacts close, and battery voltage is applied through the F9DR fuse to the cargo lamp control circuit which illuminates the cargo lamps. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a short to ground in the cargo lamp switch signal circuit.

OBDII Code B256B 2018 Chevrolet Silverado - Cargo Lamps Switch Circuit Malfunction - AutoCodes.com — B256B 2018 Chevrolet Silverado Code - Cargo Lamps Switch Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B256B 2018 Chevrolet Silverado?

Faulty Cargo Lamps Switch
Cargo Lamps Switch harness is open or shorted
Cargo Lamps Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B256B 2018 Chevrolet Silverado?

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 B256B 2018 Chevrolet Silverado 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 B256B 2018 Chevrolet Silverado 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 B256B 2018 Chevrolet Silverado Code

1. What are common symptoms of OBDII code B256B on a 2018 Chevrolet Silverado related to Cargo Lamps Switch Circuit Malfunction?

The common symptoms include inoperative cargo lamps, malfunctioning cargo lamp switch, and illuminated dashboard warning light.

2. What are the possible causes of OBDII code B256B on a 2018 Chevrolet Silverado?

Possible causes include a faulty cargo lamp switch, damaged wiring or connectors in the cargo lamp circuit, or a malfunctioning control module.

3. How can I diagnose OBDII code B256B on a 2018 Chevrolet Silverado?

You can diagnose the code by conducting a visual inspection of the cargo lamp switch and circuit, checking for damaged wiring or connectors, and using a diagnostic scanner to retrieve trouble codes and perform further tests.

4. Can I still drive my 2018 Chevrolet Silverado with OBDII code B256B?

While the vehicle may still be operational with this code, it is recommended to address the issue promptly to ensure the proper functioning of the cargo lamps and prevent any potential electrical issues.

5. How can I repair OBDII code B256B on my 2018 Chevrolet Silverado?

Repair options include replacing the cargo lamp switch, repairing or replacing damaged wiring or connectors, and resetting the control module to clear the trouble code.

6. Will OBDII code B256B on a 2018 Chevrolet Silverado cause any other problems?

While the code specifically relates to the cargo lamps switch circuit, unresolved issues may lead to further electrical problems or affect the overall functionality of the vehicle's lighting system.

7. Can a DIY enthusiast fix OBDII code B256B on a 2018 Chevrolet Silverado?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code by following repair guides, but professional assistance is recommended for complex electrical issues.

8. How much does it cost to repair OBDII code B256B on a 2018 Chevrolet Silverado?

The cost of repair can vary depending on the specific cause of the issue, but it may involve parts replacement, labor costs, and diagnostic fees, which could range from a few hundred to over a thousand dollars.

9. Is OBDII code B256B a common issue in 2018 Chevrolet Silverado vehicles?

While not extremely common, occurrences of this code can still occur due to various factors such as wear and tear, electrical faults, or component failures in the cargo lamp system.

10. Can resetting the OBDII system clear code B256B on a 2018 Chevrolet Silverado?

Resetting the OBDII system may temporarily clear the trouble code, but if the underlying issue causing code B256B is not addressed, the code is likely to reappear.