Engine-Codes - Chevrolet - B1009 Chevrolet

B1009 Chevrolet Code - EEPROM Cchecksum Error

- Code Popularity: 5,332 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B1009 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Control Module
  • Control Module harness is open or shorted
  • Control Module circuit poor electrical connection
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How to Fix the DTC B1009 Chevrolet?

Check 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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B1009 Chevrolet code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the B1009 Chevrolet Code Mean?

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.

B1009 Chevrolet Code - EEPROM Cchecksum Error

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