AutoCodes – Buick – B1508 Buick

B1508 Buick Code - Low Voltage On Control Circuit

Quick Answer

The Body Control Module (BCM) monitors the load control circuit for opens, shorts to ground, and shorts to voltage. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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: B1508 Buick indicates Low Voltage On Control Circuit.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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 317

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 Jun 13, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1508 Buick Description

The Body Control Module (BCM) monitors the load control circuit for opens, shorts to ground, and shorts to voltage. The circuit starts at the BCM and travels to the I/P fuse panel where the circuit splits to supply power for the heated seat switch and Heating, Ventilation, and Air Conditioning (HVAC) control head for the rear defog relay driver.

OBDII Code B1508 Buick - Low Voltage On Control Circuit - AutoCodes.com — B1508 Buick Code - Low Voltage On Control Circuit

What does this mean?

What are the Possible Causes of the DTC B1508 Buick?

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

How to Fix the DTC B1508 Buick?

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 B1508 Buick 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 more information on how to fix the B1508 Buick code? Get Access to Factory Service Manuals

Need Help with the 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 B1508 Buick Code

1. What does OBDII code B1508 mean on a Buick?

Code B1508 indicates a low voltage condition on the control circuit, often related to a specific component like a switch, relay, or module.

2. What are common symptoms of code B1508 in a Buick?

Symptoms may include malfunctioning electrical accessories, dim or flickering lights, error messages on the dashboard, or intermittent operation of the affected circuit.

3. What causes the B1508 code to appear?

Common causes include a weak or faulty battery, corroded or loose wiring connections, a defective relay, or a malfunctioning control module.

4. Can a low battery trigger code B1508?

Yes, a low or failing battery can cause insufficient voltage in the control circuit, triggering the B1508 code.

5. How can I diagnose the B1508 code in my Buick?

Start by checking the battery voltage, inspecting wiring and connectors for damage or corrosion, and testing any associated relays or modules for proper operation.

6. Is it safe to drive with the B1508 code on my Buick?

It may be safe to drive in some cases, but ignoring the issue could lead to further electrical problems or failure of critical systems.

7. How do I fix the B1508 code on my Buick?

Repairs may include replacing a weak battery, repairing or replacing damaged wiring, cleaning corroded connections, or replacing a faulty relay or module.

8. Can a bad ground connection cause code B1508?

Yes, a poor ground connection can result in low voltage on the control circuit and trigger the B1508 code.

9. How much does it cost to fix the B1508 code on a Buick?

Repair costs can vary widely, from under $50 for simple fixes like cleaning connections to $500 or more for replacing a control module.

10. Do I need a professional to fix the B1508 code?

While some issues like checking the battery or cleaning connections can be handled by DIY enthusiasts, more complex repairs involving control modules or in-depth diagnostics may require professional assistance.