AutoCodes – Cadillac – B1390 Cadillac

B1390 Cadillac 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 Cadillac 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 2,378

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

What does this mean?

What are the Possible Causes of the DTC B1390 Cadillac?

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 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 B1390 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 B1390 Cadillac Code

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

- Common symptoms may include issues with starting the vehicle, rough idling, poor engine performance, and possible stalling.

2. What are the potential causes of OBDII code B1390 in a Cadillac?

- The code B1390 in a Cadillac may be caused by a faulty control module, wiring issues, a blown fuse, or a weak battery.

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

- Diagnosis involves checking the control module connections, inspecting the wiring for any damage, testing the battery voltage, and ensuring fuses related to the control module are intact.

4. Can a DIY enthusiast repair OBDII code B1390 in a Cadillac related to the Control Module Supply Circuit 1?

- While simple checks like inspecting wiring and fuses can be done by a DIY enthusiast, resolving complex issues with the control module may require professional diagnostic tools and expertise.

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

- It is not recommended to drive your Cadillac with this code as it can lead to further damage to the control module and potentially compromise vehicle performance and safety.

6. How much does it typically cost to repair OBDII code B1390 in a Cadillac associated with the Control Module Supply Circuit 1?

- Repair costs for this code can vary depending on the specific issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can resetting the OBDII system clear the B1390 code related to the Control Module Supply Circuit 1 in my Cadillac?

- Resetting the system may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear after some driving cycles.

8. Are there any preventive measures to avoid encountering OBDII code B1390 in a Cadillac due to Control Module Supply Circuit 1 problems?

- Regular vehicle maintenance, including checking the battery health, inspecting wiring for wear, and addressing any electrical issues promptly, can help prevent this code from appearing.

9. Will OBDII code B1390 impacting the Control Module Supply Circuit 1 cause my Cadillac to fail an emissions test?

- Yes, since the control module plays a crucial role in emissions control, a fault triggering code B1390 can lead to emissions exceeding regulatory limits and result in a failed emissions test.

10. How long does it take to repair OBDII code B1390 related to the Control Module Supply Circuit 1 in a Cadillac?

- The repair time can vary depending on the complexity of the issue, availability of parts, and the technician's workload, but it may range from a few hours to a day or more.