Engine-Codes - Chevrolet - B1009 CHEVROLET

B1009 CHEVROLET - EEPROM Cchecksum Error

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B1009 CHEVROLET Possible Causes

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

How is the B1009 CHEVROLET code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the B1009 CHEVROLET code

Labor: 1.0

The cost to diagnose the B1009 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B1009 CHEVROLET Meaning

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.

More Information

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