AutoCodes – Buick – B1390 Buick

B1390 Buick Code - Control Module Supply Circuit 1

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Low battery voltage, Faulty Control Module, Control Module harness is open or shorted. 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: B1390 Buick indicates Control Module Supply Circuit 1.
Common causes: Common causes include Low battery voltage, Faulty Control Module, Control Module harness is open or shorted.
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 3,013

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 Jul 11, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1390 Buick Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Damage to components, and incorrect data can occur when the voltage is out of range. The vehicle has multiple Control Modules that will set this Diagnostic Trouble Code (DTC).

OBDII Code B1390 Buick - Control Module Supply Circuit 1 - AutoCodes.com — B1390 Buick Code - Control Module Supply Circuit 1

What does this mean?

What are the Possible Causes of the DTC B1390 Buick?

Low battery voltage
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC B1390 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 B1390 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.

Need more information about the B1390 Buick code?

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Need Help with the Code?

Get the B1390 Buick 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 B1390 Buick Code

1. What are the common symptoms of OBDII code B1390 in a Buick related to the Control Module Supply Circuit 1?

- Common symptoms include issues with starting the vehicle, sporadic engine stalling, and intermittent power loss.

2. What are the possible causes of OBDII code B1390 in a Buick?

- Causes may include a faulty control module, damaged wiring in the supply circuit, loose connections, or a malfunctioning power relay.

3. How can I diagnose the Control Module Supply Circuit 1 issue triggering OBDII code B1390 in my Buick?

- A thorough visual inspection of wiring and connectors, testing the power relay, and using a multimeter to check voltage levels can help diagnose the problem.

4. Are there any DIY repair tips for addressing OBDII code B1390 in a Buick?

- DIY repair tips may include checking and tightening electrical connections, replacing damaged wiring, and, if necessary, replacing the control module or power relay.

5. Can a weak car battery cause OBDII code B1390 to trigger in a Buick?

- Yes, a weak car battery can potentially cause voltage irregularities in the control module supply circuit, leading to the triggering of code B1390.

6. Is it safe to continue driving my Buick with OBDII code B1390 related to the Control Module Supply Circuit 1?

- It is not recommended to drive the vehicle with unresolved OBDII code B1390 as it can lead to further electrical issues and potential safety risks.

7. How much can I expect to pay for professional repairs for OBDII code B1390 in a Buick?

- The cost of professional repairs for OBDII code B1390 can vary depending on the exact cause, but it may range from $100 to $500 or more, including parts and labor.

8. Can resetting the OBDII system clear the B1390 code temporarily in a Buick?

- Resetting the OBDII system may temporarily clear the B1390 code, but if the underlying issue is not addressed, the code is likely to reappear.

9. Will disconnecting the car battery reset the Control Module Supply Circuit 1 issue causing OBDII code B1390 in my Buick?

- Disconnecting the car battery can sometimes reset the system, but it may not resolve the root cause of the B1390 code related to the control module supply circuit.

10. How can I prevent OBDII code B1390 related to the Control Module Supply Circuit 1 from occurring in my Buick in the future?

- Regularly inspecting and maintaining the electrical components, ensuring secure connections, and addressing any warning signs promptly can help prevent the recurrence of OBDII code B1390.