GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Colorado Pickup - 4WD 🢒 DTC 🢒 DTC B1009

Circuit Description

Each control module runs a program to detect internal memory faults. No external circuits are involved. If an electrically erasable programmable read-only memory (EEPROM) checksum error is detected, that control module may set DTC B1009.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1009 EEPROM Checksum Mismatch

Conditions for Running the DTC
    • The control module has power and ground.
    • The ignition is ON.

Conditions for Setting the DTC

The control module detects an EEPROM checksum malfunction.

Action Taken When the DTC Sets

The module reverts to the base operation values programed for those blocks of data that have failed the checksum test. The blocks of data that have not failed the checksum test are not affected.

Conditions for Clearing the DTC
    • A current DTC clears when the ignition is cycled, and the malfunction is no longer present.
    • A history DTC clears when the ignition has been cycled 100 times without a repeat of the malfunction.

Diagnostic Aids
    • This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
    • If this DTC is retrieved as both a current and history DTC, replace the module.

Step

Action

Yes

No

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check for the system exhibiting the symptom?

Go to Step 2

Go to Control Module References for the applicable Diagnostic System Check

2

Is the module setting DTC B1009 the body control module (BCM)?

Go to Step 3

Go to Step 4

3
  1. Reprogram the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration .
  2. Complete the recalibration procedure.
  3. Clear the DTCs with the scan tool.
  4. Operate the vehicle within the Conditions for Running the DTC.

Does DTC B1009 reset?

Go to Step 5

System OK

4
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. Retrieve DTCs.

Is DTC B1009 retrieved as a current DTC?

Go to Step 5

Go to Diagnostic Aids

5

Important: Perform the module setup procedure if required.

Replace the module. Refer to Control Module References .

Did you complete the replacement?

Go to Step 6

--

6
  1. Clear the DTCs with the scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does DTC B1009 reset?

Go to Step 2

System OK