AutoCodes – Buick – B1004 Buick

B1004 Buick Code - Keep Alive Memory

Quick Answer

This fault is internal. Common causes include Faulty Control Module, Control Module harness is open or shorted, 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: B1004 Buick indicates Keep Alive Memory.
Common causes: Common causes include Faulty Control Module, Control Module harness is open or shorted, 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 3,988

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 Mar 11, 2021

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1004 Buick Description

This fault is internal. No external circuits are involved. Module microprocessor must be active/awake for the Diagnostic Trouble Code (DTC) to set. The microprocessor calculates the checksum on those areas of memory that hold critical operation data. This is done at a regular interval and is called a periodic checksum. The microprocessor also calculates a checksum on these memory locations whenever new data is written to them. This is called the running checksum. The microprocessor compares periodic checksum to running checksum. If they do not match, the microprocessor sets DTC B1004.
When DTC is set, microprocessor reverts back to base programmed critical operating data until new data is learned and stored in Keep Alive Memory (KAM). DTC will clear when the microprocessor calculates a successful comparison of periodic checksum to running checksum.

OBDII Code B1004 Buick - Keep Alive Memory - AutoCodes.com — B1004 Buick Code - Keep Alive Memory

What does this mean?

What are the Possible Causes of the DTC B1004 Buick?

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

How to Fix the DTC B1004 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 does this mean?

Code Tech Notes

This Diagnostic Trouble Code (DTC) may be stored as history without affecting the operation of the module. If DTC is stored only as history and not current, do not replace the module. DTC will never set as current during testing unless a non-recoverable memory failure. Intermittent interruptions to either hot at all times supply or processor ground will cause the module to set DTC. If this DTC is retrieved as both current and history, replace the module that set DTC.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1004 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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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 B1004 Buick Code

1. What does OBDII code B1004 for Buick mean?

Code B1004 indicates an issue with the Keep Alive Memory in the vehicle's system.

2. What are the common symptoms of a B1004 Buick code?

Common symptoms include intermittent starting issues, loss of stored settings (like radio stations or clock time), and sporadic dashboard warning lights.

3. What causes the B1004 Buick code to trigger?

The B1004 code is often triggered by a loose or corroded connection in the Keep Alive Memory circuit, a faulty power supply to the memory module, or a failing memory module itself.

4. How do I diagnose the B1004 Buick code?

Diagnosing the B1004 code involves checking the connections to the Keep Alive Memory module, testing the power supply to the module, and inspecting the module for any signs of damage or malfunction.

5. Can I still drive my Buick with a B1004 code?

It is generally safe to drive your Buick with a B1004 code, but it is recommended to address the issue promptly to avoid potential starting or electrical system problems in the future.

6. How do I repair the B1004 Buick code?

Repairing the B1004 code typically involves fixing any loose connections, cleaning corroded terminals, replacing damaged wiring, or replacing the Keep Alive Memory module if necessary.

7. Is the B1004 Buick code easy to fix at home?

Fixing the B1004 code at home may be possible for those with automotive repair experience and the necessary tools. However, if you are unsure, it is best to consult a professional mechanic.

8. How much does it cost to repair a B1004 Buick code?

The cost of repairing a B1004 code can vary depending on the underlying cause and whether you choose to fix it yourself or take it to a mechanic. Costs may range from a simple DIY repair to a more expensive module replacement.

9. Can a B1004 Buick code reset on its own?

In some cases, the B1004 code may reset on its own after the underlying issue is resolved. However, it is recommended to clear the code using an OBDII scanner after making any repairs.

10. How can I prevent the B1004 Buick code from reoccurring?

To prevent the B1004 code from reoccurring, it is essential to ensure all electrical connections are secure, keep the battery terminals clean, and address any electrical issues promptly to maintain the health of the Keep Alive Memory system.