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B1004 Chevrolet Code - Keep Alive Memory

Quick Answer

The B1004 diagnostic trouble code for Chevrolet vehicles specifically refers to an issue with the Keep Alive Memory (KAM) in the vehicle's onboard computer system. Common causes include Weak or failing battery, Faulty alternator, Poor electrical connections. 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 Chevrolet indicates Keep Alive Memory.
Common causes
Common causes include Weak or failing battery, Faulty alternator, Poor electrical connections.
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 07, 2024
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Code B1004 Chevrolet Description

The B1004 diagnostic trouble code for Chevrolet vehicles specifically refers to an issue with the Keep Alive Memory (KAM) in the vehicle's onboard computer system. The KAM is a critical component that stores important data and settings even when the vehicle is turned off. This data includes learned adjustments, fuel trim values, idle speed settings, and other vital information that the engine control module (ECM) uses to optimize performance and efficiency.

OBDII Code B1004 Chevrolet - Keep Alive Memory
B1004 Chevrolet Code - Keep Alive Memory

Common Causes of B1004 Chevrolet

  1. Weak or failing battery
  2. Faulty alternator
  3. Poor electrical connections
  4. Sudden loss of power to the ECM
  5. Extreme temperature fluctuations

Symptoms of B1004 Chevrolet

  1. Engine misfires or rough idling
  2. Decreased fuel efficiency
  3. Difficulty starting the vehicle
  4. Illumination of the check engine light
  5. Loss of stored radio presets and other settings

How to Fix B1004 Chevrolet

  1. Begin by checking the vehicle's battery for proper voltage and connections. Replace the battery if necessary.
  2. Inspect the alternator for proper functionality and replace if it is not charging the battery correctly.
  3. Check all electrical connections to ensure they are secure and free of corrosion.
  4. Use a scan tool to reset the KAM in the ECM and relearn idle settings and fuel trims.
  5. Test drive the vehicle to ensure that the code does not return and that the performance issues have been resolved.

Cost to Fix B1004 Chevrolet

The typical repair costs for addressing the B1004 code can vary depending on the specific cause of the issue. In general, replacing a battery can cost between $100 and $200, while an alternator replacement can range from $300 to $600. Labor costs can add an additional $80 to $150 per hour, depending on the shop's rates and location. It is advisable to consult with a professional mechanic for a more accurate estimate based on the vehicle's make and model.

What does this mean?

Tech Notes for B1004 Chevrolet

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 Chevrolet Code

1. What is OBDII code B1004 for Chevrolet?

Code B1004 for Chevrolet refers to a fault in the Keep Alive Memory (KAM) system, which stores crucial data for the vehicle's operation.

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

Common symptoms of a B1004 code may include issues with engine starting, rough idling, poor fuel efficiency, and potential stalling.

3. What can cause a B1004 code to appear in a Chevrolet vehicle?

A B1004 code in a Chevrolet can be triggered by a failing KAM module, wiring issues, or a drained vehicle battery.

4. How is the Keep Alive Memory system related to the B1004 code?

The Keep Alive Memory system, responsible for storing important data for the vehicle's operation, can trigger a B1004 code if it fails to retain or provide necessary information.

5. Can a B1004 code be reset without addressing the underlying issue?

Resetting a B1004 code without addressing the root cause, such as a faulty KAM module or wiring problem, may result in the code reappearing once the issue persists.

6. How can I diagnose and repair a B1004 code in my Chevrolet?

Diagnosing a B1004 code typically involves inspecting the KAM module, checking related wiring for damage, and testing the battery voltage. Repairs may include replacing the KAM module or repairing damaged wiring.

7. Is it safe to continue driving with a B1004 code present?

It is not recommended to drive with a B1004 code as it can lead to potential engine performance issues and even vehicle stalling, posing a safety risk.

8. Can a DIY enthusiast fix a B1004 code at home?

Depending on the cause of the B1004 code, DIY enthusiasts with automotive repair knowledge may be able to address the issue by replacing the KAM module or repairing wiring themselves.

9. How much does it typically cost to repair a B1004 code in a Chevrolet?

The cost of repairing a B1004 code in a Chevrolet can vary based on the underlying cause, but it may range from $100 to $300 for parts and labor at a dealership or repair shop.

10. Will a B1004 code cause my vehicle to fail emissions testing?

A B1004 code can indicate underlying issues with the vehicle's emissions system, potentially leading to failure in emissions testing. It is advisable to address the code before undergoing emissions testing.

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