Hummer H2. Manual — part 184

The year when module was built.

DIAGNOSTIC TROUBLE CODE (DTC) LIST

Diagnostic Trouble Code (DTC) List

DTC B1000

Circuit Description

The internal fault detection is handled inside the control module. No external circuits are involved.

Conditions for Running the DTC

The module runs the program to detect an internal fault when power up is commanded. The only requirements
are voltage and ground. This program runs even if the voltage is out of the valid operating range.

Conditions for Setting the DTC

The module has detected an internal malfunction.

Action Taken When the DTC Sets

The module refuses all additional inputs.

Conditions for Clearing the DTC

z

A current DTC clears when the malfunction is no longer present.

z

A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat
of the malfunction.

Diagnostic Aids

z

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.

DTC

Diagnostic

Procedure

Module

B1000 DTC B1000

Audio Amplifier, BCM, DDM, DSM, FPDM, HVAC, IPC, Radio, SDM,
VCIM

B1004 DTC B1004

VCIM

B1007 DTC B1007

VCIM

B1009 DTC B1009

VCIM

B1397 DTC B1397

BCM

B1440 DTC B1440

BCM

C0550 DTC C0550

EBCM, ESC, TCSCM

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Body Control System - Hummer H2

z

If this DTC is retrieved as both a current and history DTC, replace the module.

DTC B1000

DTC B1004

Circuit Description

The internal fault detection is handled inside the control module. No external circuits are involved.

Conditions for Running the DTC

The module microprocessor must be active/awake.

Conditions for Setting the DTC

This DTC indicates the KAM in the module has been reset. It is a normal occurrence when battery positive
voltage or ground is removed from the module, such as a battery disconnect.

Action Taken When the DTC Sets

The microprocessor reverts back to the base programmed critical operating data until new data is learned and

Step

Action

Yes

No

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

1. Install a scan tool.

2. Turn ON the ignition, with the engine OFF.

3. Retrieve DTCs.

Is the DTC retrieved as a current DTC?

Go to

Step 3

Go to Diagnostic Aids

3

Replace the control module setting the DTC as current.
Refer to Control Module References .Did you
complete the replacement?

IMPORTANT:

Perform the programming or setup procedure for the
module if required.

Go to

Step 4

-

4

1. Use the scan tool in order to clear the DTCs.

2. Operate the vehicle within the Conditions for

Running the DTC as specified in the supporting
text.

Does the DTC reset?

Go to

Step 2

System OK

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Body Control System - Hummer H2

stored in KAM.

Conditions for Clearing the DTC

z

A current DTC clears when the malfunction is no longer present.

z

A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat
of the malfunction.

Diagnostic Aids

z

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.

z

If this DTC is retrieved as both a current and history DTC, replace the module.

DTC B1004

DTC B1007

Circuit Description

As part of normal data processing, the module performs a data programming check on its writes to the
electrically erasable read only memory (EEPROM). The EEPROM write error detection is handled inside the

Step

Action

Yes

No

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

1. Install a scan tool.

2. Turn ON the ignition, with the engine OFF.

3. Retrieve DTCs.

Is the DTC retrieved as a current DTC?

Go to

Step 3

Go to Diagnostic Aids

3

Replace the control module setting the DTC as current.
Refer to Control Module References .Did you
complete the replacement?

IMPORTANT:

Perform the programming or setup procedure for the
module if required.

Go to

Step 4

-

4

1. Use the scan tool in order to clear the DTCs.

2. Operate the vehicle within the Conditions for

Running the DTC as specified in the supporting
text.

Does the DTC reset?

Go to

Step 2

System OK

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Body Control System - Hummer H2

control module. No external circuits are involved.

Conditions for Running the DTC

The module runs the program to detect an EEPROM write error. The only requirements are battery positive
voltage and ground. This program runs even if the battery positive voltage is out of the valid operating range.

Conditions for Setting the DTC

The module writes information to a data block in the EEPROM. The module then reads the data and compares it
to what was sent to the data block. If the data does not match after 3 consecutive attempts, the module sets the
DTC.

Action Taken When the DTC Sets

The module writes to another area of the EEPROM, this becomes the new permanent area to store the data. The
data location is allowed to change until all of the available EEPROM is used. If a B1004 DTC is also set, the
module reverts to base operation values programmed for those blocks of data that have failed. The blocks of
data that have not failed the checksum test are not affected.

Conditions for Clearing the DTC

z

A current DTC clears when the malfunction is no longer present.

z

A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat
of the malfunction.

Diagnostic Aids

z

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.

z

If this DTC is retrieved as both a current and history DTC, replace the module.

DTC B1007

Step

Action

Yes

No

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

1. Install a scan tool.

2. Turn ON the ignition, with the engine OFF.

3. Retrieve DTCs.

Is the DTC retrieved as a current DTC?

Go to

Step 3

Go to Diagnostic Aids

IMPORTANT:

Perform the programming or setup procedure for the
module if required.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Body Control System - Hummer H2