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B1004 Buick Code - Keep Alive Memory

Quick Answer

The B1004 diagnostic trouble code for Buick vehicles relates to the Keep Alive Memory (KAM) in the vehicle's Powertrain Control Module (PCM). Common causes include Weak or dead battery, Faulty PCM, 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 Weak or dead battery, Faulty PCM, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B1004 Buick Description

The B1004 diagnostic trouble code for Buick vehicles relates to the Keep Alive Memory (KAM) in the vehicle's Powertrain Control Module (PCM). The KAM is a small amount of memory that stores critical data when the vehicle is turned off, such as fuel trim values, idle speed settings, and other adaptive parameters. This information is essential for the PCM to operate efficiently and effectively in controlling the engine's performance.

OBDII Code B1004 Buick - Keep Alive Memory
B1004 Buick Code - Keep Alive Memory

Common Causes of B1004 Buick

  1. Weak or dead battery
  2. Faulty PCM
  3. Poor electrical connection
  4. Software glitch

Symptoms of B1004 Buick

  1. Rough idle
  2. Poor fuel economy
  3. Hesitation during acceleration
  4. Difficulty starting
  5. Stalling

How to Fix B1004 Buick

  1. Check and replace the vehicle's battery if necessary.
  2. Inspect and clean the electrical connections to ensure a secure connection.
  3. Perform a PCM reset to clear the KAM and relearn the adaptive parameters.
  4. Update the PCM software to the latest version to prevent future memory loss.
  5. If the issue persists, consider replacing the PCM with a new unit.

Cost to Fix B1004 Buick

The cost of repairing the B1004 code can vary depending on the specific cause of the issue. In general, replacing a vehicle's battery can range from $100 to $200, while cleaning electrical connections may cost around $50 to $100. If a PCM reset is required, labor costs may add an additional $100 to $200. Replacing the PCM unit itself can be more expensive, ranging from $500 to $1000 or more, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for B1004 Buick

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.

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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.

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