AutoCodes – Cadillac – B1508 Cadillac

B1508 Cadillac 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 Cadillac 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 512

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

What does this mean?

What are the Possible Causes of the DTC B1508 Cadillac?

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 Cadillac?

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 Cadillac 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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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 Cadillac Code

1. What are the common symptoms of OBDII code B1508 Cadillac (Low Voltage On Control Circuit)?

- Common symptoms include intermittent or permanent illumination of the Check Engine light, poor vehicle performance, and issues with the control circuit functionality.

2. What could be the possible causes of OBDII code B1508 Cadillac?

- Possible causes of this code include a faulty control module, damaged wiring or connectors in the control circuit, or a malfunctioning sensor connected to the circuit.

3. How can I diagnose the underlying issue causing OBDII code B1508 Cadillac?

- To diagnose the issue, you can use a diagnostic scanner to read the code and perform a thorough inspection of the control circuit, connectors, and related components for any visible damage.

4. What are some repair tips for addressing OBDII code B1508 Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors in the control circuit, replacing a faulty control module or sensor, and clearing the code to see if it reoccurs.

5. Can OBDII code B1508 Cadillac be fixed without professional help?

- Depending on your level of automotive knowledge and experience, it may be possible to address this code yourself by following repair guides, but seeking professional help is recommended for accurate diagnosis and repair.

6. Is it safe to continue driving with OBDII code B1508 Cadillac present?

- It is not recommended to continue driving with this code present, as it may lead to further damage to the vehicle and potentially compromise safety and performance.

7. How much does it typically cost to repair OBDII code B1508 Cadillac?

- The repair cost for this code can vary significantly depending on the specific cause of the issue, the needed parts, and labor rates, so it is best to get a professional diagnosis and estimate.

8. What are some preventive measures to avoid OBDII code B1508 Cadillac in the future?

- To prevent this code from appearing in the future, regular maintenance checks, keeping the control circuit components clean and well-maintained, and addressing any electrical issues promptly can help.

9. Will resetting the OBDII system clear OBDII code B1508 Cadillac?

- While resetting the OBDII system may temporarily clear the code, it is important to diagnose and address the underlying issue causing the code to prevent it from reappearing.

10. Can extreme weather conditions affect OBDII code B1508 Cadillac?

- Extreme weather conditions such as extreme heat or cold can potentially impact the electrical components associated with the control circuit, leading to the triggering of this code.