AutoCodes – Generic – B1864

B1864 Code - Battery Power Supply ECU Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Battery Power Supply ECU. Common causes include Faulty Battery Power Supply ECU, Battery Power Supply ECU harness is open or shorted, Battery Power Supply ECU 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: B1864 indicates Battery Power Supply ECU Circuit Failure.
Common causes: Common causes include Faulty Battery Power Supply ECU, Battery Power Supply ECU harness is open or shorted, Battery Power Supply ECU 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 14,840

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 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1864 Description

The Body Control Module (BCM) monitors the Battery Power Supply ECU. The BCM sets the OBDII code when the Battery Power Supply ECU is not to factory specifications.

OBDII Code B1864 - Battery Power Supply ECU Circuit Failure - AutoCodes.com — B1864 Code - Battery Power Supply ECU Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1864?

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

How to Fix the DTC B1864?

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 B1864 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 B1864 code?

Need more information on how to fix the B1864 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1864 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 B1864 Code

1. What are the common symptoms of OBDII code B1864 (Battery Power Supply ECU Circuit Failure)?

The common symptoms include issues starting the vehicle, dimming or flickering lights, and a malfunctioning electrical system.

2. What are the possible causes of OBDII code B1864?

Possible causes of this code include a faulty battery, alternator issues, wiring problems, or a malfunctioning Electronic Control Unit (ECU).

3. How can I diagnose the Battery Power Supply ECU Circuit Failure code?

Diagnosing this code typically involves checking the battery voltage, testing the alternator output, inspecting the wiring for damage, and scanning the ECU for any fault codes.

4. What are the repair options for OBDII code B1864?

Repair options may include replacing the battery, repairing or replacing the alternator, fixing any damaged wiring, or replacing the ECU if necessary.

5. Can driving with OBDII code B1864 cause further damage to the vehicle?

Continuing to drive with this code can potentially cause damage to other electrical components in the vehicle and may lead to a complete loss of power.

6. How urgent is it to address OBDII code B1864?

It is recommended to address this code as soon as possible to prevent further damage to the electrical system and ensure the vehicle operates safely.

7. Are there any simple DIY fixes for OBDII code B1864?

Simple DIY fixes may include checking and tightening battery connections, inspecting and cleaning corroded terminals, and ensuring proper grounding.

8. What are the typical costs associated with repairing OBDII code B1864?

The costs can vary depending on the specific cause of the issue, but repairs for this code may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a weak battery trigger OBDII code B1864?

Yes, a weak or failing battery can lead to voltage fluctuations that may trigger this code, so it is important to ensure the battery is in good condition.

10. How can I prevent OBDII code B1864 from recurring?

Regularly maintaining the battery, alternator, and electrical system, as well as addressing any warning signs promptly, can help prevent the recurrence of this code.