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AutoCodes – Chevrolet – B256B 2016 Chevrolet Silverado

B256B 2016 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 2016 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 192
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on May 26, 2023
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Code B256B 2016 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 2016 Chevrolet Silverado - Cargo Lamps Switch Circuit Malfunction - AutoCodes.com
B256B 2016 Chevrolet Silverado Code - Cargo Lamps Switch Circuit Malfunction
What does this mean?

What are the Possible Causes of the DTC B256B 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the B256B 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B256B 2016 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2016 Chevrolet Silverado Code

1. What does the OBDII code B256B mean on a 2016 Chevrolet Silverado?

The B256B code indicates a malfunction in the cargo lamps switch circuit, which controls the truck bed lighting.

2. What are the common symptoms of the B256B code in a 2016 Chevrolet Silverado?

Symptoms may include non-functional cargo lamps, a dashboard warning light, or intermittent operation of the cargo lamp switch.

3. What causes the B256B code on a 2016 Chevrolet Silverado?

Common causes include a faulty cargo lamp switch, damaged wiring or connectors, or a malfunctioning body control module (BCM).

4. How do you diagnose the B256B code on a 2016 Chevrolet Silverado?

Diagnosis involves checking the cargo lamp switch for proper operation, inspecting wiring and connectors for damage, and scanning the BCM for additional fault codes.

5. Can a faulty cargo lamp switch cause the B256B code?

Yes, a malfunctioning cargo lamp switch is one of the most common causes of this code.

6. How can I fix the B256B code on my 2016 Chevrolet Silverado?

Repairs may include replacing the cargo lamp switch, repairing damaged wiring or connectors, or reprogramming or replacing the BCM if necessary.

7. Is the B256B code serious for my 2016 Chevrolet Silverado?

While it does not affect drivability, it can impair the functionality of the cargo lamps, which might be inconvenient during nighttime use.

8. Can I drive my 2016 Chevrolet Silverado with the B256B code?

Yes, you can drive the truck, but the cargo lamps may not function properly until the issue is resolved.

9. How much does it cost to fix the B256B code on a 2016 Chevrolet Silverado?

Repair costs vary, but replacing the cargo lamp switch typically costs $50-$100 for parts, plus labor if done professionally.

10. Can a dead fuse cause the B256B code in a 2016 Chevrolet Silverado?

It’s possible if the fuse related to the cargo lamp circuit is blown. Check the fuse box for any blown fuses and replace them if necessary.

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