AutoCodes – Chevrolet – B1004 Chevrolet

B1004 Chevrolet 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 Chevrolet 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 8,640

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 Chevrolet 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 Chevrolet - Keep Alive Memory - AutoCodes.com — B1004 Chevrolet Code - Keep Alive Memory

What does this mean?

What are the Possible Causes of the DTC B1004 Chevrolet?

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

How to Fix the DTC B1004 Chevrolet?

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 Chevrolet 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 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.