AutoCodes – Chevrolet – B256B 2017 Chevrolet Silverado

B256B 2017 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 2017 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 244

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2017 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 2017 Chevrolet Silverado - Cargo Lamps Switch Circuit Malfunction - AutoCodes.com — B256B 2017 Chevrolet Silverado Code - Cargo Lamps Switch Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B256B 2017 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 2017 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 2017 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 2017 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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B256B in a 2017 Chevrolet Silverado related to Cargo Lamps Switch Circuit Malfunction?

- Common symptoms include non-functioning cargo lamps, flickering lights, or inconsistent operation of the cargo lamp switch.

2. What are the potential causes of OBDII code B256B in a 2017 Chevrolet Silverado?

- The code B256B can be triggered by issues such as a faulty cargo lamp switch, wiring problems, blown fuses, or a malfunctioning control module.

3. How can I diagnose the Cargo Lamps Switch Circuit Malfunction in my 2017 Chevrolet Silverado?

- Diagnose the issue by checking the cargo lamp switch for proper operation, inspecting the wiring for any damage or loose connections, and using an OBDII scanner to read the specific error codes.

4. Can a DIY enthusiast repair OBDII code B256B in a 2017 Chevrolet Silverado?

- Depending on the exact cause, a DIY enthusiast may be able to repair the issue by replacing a faulty cargo lamp switch, fixing wiring problems, or replacing blown fuses. However, more complex issues may require professional assistance.

5. Are there any quick tips for resolving the Cargo Lamps Switch Circuit Malfunction in a 2017 Chevrolet Silverado?

- Quick tips include checking the cargo lamp switch for proper functionality, ensuring all fuses related to the cargo lamps are intact, and inspecting the wiring harness for any visible damage.

6. How critical is it to address OBDII code B256B in a 2017 Chevrolet Silverado promptly?

- While the cargo lamp issue may not affect the vehicle's drivability, addressing the code promptly is recommended to avoid potential safety hazards and ensure the proper functioning of the cargo lamps.

7. Can a faulty cargo lamp switch cause other electrical issues in a 2017 Chevrolet Silverado?

- Yes, a faulty cargo lamp switch can potentially cause other electrical issues in the vehicle, including problems with the cargo lamp operation, interior lighting, or even affecting other components on the same circuit.

8. Is it necessary to reset the OBDII system after repairing the Cargo Lamps Switch Circuit Malfunction in a 2017 Chevrolet Silverado?

- Yes, it is advisable to reset the OBDII system after repairing the issue to clear any stored error codes and ensure the system recognizes the repair. This can be done using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

9. What should I do if I have addressed the Cargo Lamps Switch Circuit Malfunction but the issue persists in my 2017 Chevrolet Silverado?

- If the issue persists after addressing the cargo lamps switch circuit malfunction, it is recommended to consult a professional mechanic or dealership for a thorough diagnostic and repair process to identify any underlying issues.

10. Can weather conditions or environmental factors contribute to triggering OBDII code B256B in a 2017 Chevrolet Silverado?

- Yes, extreme weather conditions or exposure to moisture can potentially contribute to triggering the cargo lamps switch circuit malfunction code. It is important to keep the vehicle protected and address any potential water ingress points.