AutoCodes – Chevrolet – B1009 Chevrolet

B1009 Chevrolet Code - EEPROM Cchecksum Error

Quick Answer

EEPROM checksum error detection 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: B1009 Chevrolet indicates EEPROM Cchecksum Error.
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 6,173

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
Cost to Diagnose
FAQs
Comments
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Code B1009 Chevrolet Description

EEPROM checksum error detection is internal. No external circuits are involved. For DTC to set, the microprocessor must run the program to detect a checksum error after each power up. The only requirements are voltage and ground. The program runs even if the voltage is out of operating range.
Microprocessor retains an inverse copy of digital value stored in certain blocks of memory in EEPROM. The microprocessor then reads information from those blocks and adds stored inverse value to current value. If they do not equal 0, the microprocessor sets DTC B1009.
When DTC is set, microprocessor reverts to base operation values programmed for those blocks of data that have failed checksum test. Blocks of data that have not failed the checksum test are not affected. DTC clears when microprocessor runs a successful checksum test of EEPROM.

OBDII Code B1009 Chevrolet - EEPROM Cchecksum Error - AutoCodes.com — B1009 Chevrolet Code - EEPROM Cchecksum Error

What does this mean?

What are the Possible Causes of the DTC B1009 Chevrolet?

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

How to Fix the DTC B1009 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1009 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 B1009 Chevrolet Code

1. What are common symptoms of OBDII code B1009 (EEPROM Cchecksum Error) in a Chevrolet?

- Common symptoms include the Check Engine light illuminating, difficulty starting the vehicle, and issues with engine performance.

2. What does the code B1009 (EEPROM Cchecksum Error) indicate in a Chevrolet?

- This code indicates that there is an error in the EEPROM checksum, which is a memory storage component in the vehicle's onboard computer system.

3. What are possible causes of the B1009 code in a Chevrolet?

- Possible causes include a faulty EEPROM, wiring issues, a loose connection, or a malfunction in the onboard computer system.

4. How can I diagnose the B1009 code in my Chevrolet?

- To diagnose the B1009 code, a professional diagnostic scan tool is needed to read the code and pinpoint the exact source of the error in the EEPROM.

5. Can I drive my Chevrolet with the B1009 code present?

- It is not recommended to drive your Chevrolet with the B1009 code present, as it can lead to potential performance issues and further damage to the vehicle.

6. How can the B1009 code in a Chevrolet be repaired?

- Repairing the B1009 code typically involves reprogramming or replacing the EEPROM, checking and repairing any wiring or connection issues, or resetting the onboard computer system.

7. Is it possible to reset the B1009 code in a Chevrolet without professional help?

- While some basic OBDII code readers can clear codes, it is recommended to have a professional diagnose and repair the underlying issue causing the B1009 code.

8. Will the B1009 code cause my Chevrolet to fail an emissions test?

- Yes, the B1009 code can cause your Chevrolet to fail an emissions test, as it indicates a problem with the vehicle's onboard computer system.

9. How much does it typically cost to repair the B1009 code in a Chevrolet?

- The cost of repairing the B1009 code can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

10. Can preventative maintenance help prevent the B1009 code in a Chevrolet?

- Performing regular maintenance, such as checking and cleaning connections, can help prevent issues that may lead to the B1009 code in a Chevrolet.