Hummer H2. Manual - part 365

Security Lamp State  

The scan tool displays On, Off or Flashing. This is the security lamp state as commanded by the BCM. 

Service 4WD  

The scan tool displays On or Off. This is the state of the service 4WD indicator as commanded by the 
IPC. 

Service Throttle Soon  

The scan tool displays On or Off. This is the state of the service throttle soon indicator as commanded by 
the IPC. 

Tow/Haul  

The scan tool displays On or Off. This is the state of the Tow/Haul indicator as commanded by the IPC. 

Trans Fluid Hot  

The scan tool displays On or Off. This is the state of trans fluid hot indicator as commanded by the IPC. 

Trip Reset Switch  

The scan tool displays On or Off. The IPC monitors the trip reset switch. A closed switch is displayed as 
On. 

Upshift Lamp  

The scan tool displays On or Off. This is the state of the upshift lamp as commanded by the IPC. 

Vehicle Speed  

The scan tool displays 0-255 km/h (0-159 mph). The BCM receives the vehicle speed information from 
the PCM 4 kppm vehicle speed signal circuit. 

Vehicle Speed  

The scan tool displays 0-255 km/h (0-159 mph). The DIC receives the vehicle speed information from the 
PCM 4 kppm vehicle speed signal circuit. 

Vehicle Speed  

The scan tool displays kilometers per hour (miles per hour). The IPC receives the vehicle speed from the 
PCM 4 kppm vehicle speed signal circuit.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

Vehicle Speed  

The scan tool displays 0-255 km/h (0-159 mph). The PCM monitors the voltage at the signal circuit of the 
vehicle speed sensor. The voltage is proportional to the vehicle speed. 

Volume  

The scan tool displays 0-100%. The percentage of volume selected at the radio. 

Wait to Start  

The scan tool displays On or Off. This is the state of the WAIT TO START indicator as displayed in the 
IPC. 

Water in Fuel  

The scan tool displays On or Off. This is the state of the water in fuel indicator in the message center as 
commanded by the IPC. 

DIAGNOSTIC TROUBLE CODE (DTC) LIST 

Diagnostic Trouble Code (DTC) List 

DTC B0540 

DTC

Diagnostic Procedure

Module(s)

B0540

DTC B0540

DIC

B0560

DTC B0560

DIC

B1372

DTC B1372

IPC

B2961

DTC B2961

BCM

BXXXX

z

Diagnostic Trouble Code (DTC) List in Lighting Systems  

z

Diagnostic Trouble Code (DTC) List in SIR  

BCM, SDM

CXXXX Refer to Diagnostic Trouble Code (DTC) List in Anti-lock Brake System

EBCM

P0461

DTC P0461

PCM

P0462

DTC P0462

PCM

P0463

DTC P0463

PCM

P0502

DTC P0502 in Automatic Transmission - 4L60-E

PCM

P0503

DTC P0503 in Automatic Transmission - 4L60-E

PCM

P0522

DTC P0522

PCM

P0523

DTC P0523

PCM

P0608

DTC P0608

PCM

P0654

DTC P0654

PCM

PXXXX Diagnostic Trouble Code (DTC) List in Engine Controls 6.0L (LQ4).

PCM

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

Circuit Description 

The instrument panel cluster (IPC) monitors the vehicle speed signal to determine the speedometer position. If 
the IPC determines the vehicle speed signal voltage is out of the normal operating range, a DTC will set. 

Conditions for Running the DTC 

z

The vehicle speed is more than 10 km/h (6 mph).  

z

The ignition voltage is between 9.0-18.0 volts.  

Conditions for Setting the DTC 

z

The IPC detects that the commanded state of the driver and the actual state of the control circuit do not 
match.  

z

The condition above must be present for a minimum of 5 seconds.  

Action Taken When the DTC Sets 

z

The IPC stores a DTC B0540 in memory.  

z

The speedometer defaults to 0 km/h (0 mph).  

z

No driver warning message will be displayed for this DTC.  

Conditions for Clearing the DTC 

z

The history DTC clears after 100 malfunction free warm-up cycles.  

z

The DTC becomes history when the conditions for setting the DTC are no longer present.  

z

The IPC receives the clear code command from the scan tool.  

DTC B0540 

Step

Action

Yes

No

Schematic Reference:Instrument Cluster Schematics

1

Did you perform the instrument panel cluster (IPC) 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument 

Cluster

2

1. Install a scan tool.  

2. Raise the vehicles drive wheels. Refer to 

Lifting and Jacking the Vehicle in General 
Information.  

3. Start the engine.  

4. Place the transmission into drive for an 

automatic transmission and third gear for a 
manual transmission.  

5. With the scan tool, observe the Vehicle Speed 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

Sensor parameter in the powertrain control 
module (PCM) Engine Data 1 data list.  

Does the Vehicle Speed Sensor parameter match the 
speedometer display?

Go to Testing for 

Intermittent Conditions 

and Poor Connections 

in Wiring Systems

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the PCM connector C2.  

3. Install the J 33431-C Signal Generator and 

Instrument Panel Tester lead to the vehicle 
speed signal circuit at the PCM harness 
connector, and the other lead to a good 
ground. See Special Tools and Equipment .  

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

5. Set the J 33431-C to generate a speedometer 

signal. See Special Tools and Equipment .  

Does the vehicle speedometer indicate a reading?

Go to Step 5

Go to Step 4

4

Test the vehicle speed signal circuit for an open, 
short to voltage or a short to ground. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect for poor connections at the PCM connector. 
Refer to Testing for Intermittent Conditions and 
Poor Connections and Connector Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for a poor connection at the harness 
connector of the IPC. Refer to Testing for 
Intermittent Conditions and Poor Connections 
and Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Did you complete the replacement?

IMPORTANT:

Program the replacement PCM. 
Replace the PCM. Refer to Powertrain Control 
Module (PCM) Replacement in Engine Controls- 
6.0L (LQ4).

Go to Step 9

-

8

Replace the IPC. Refer to Instrument Panel 
Cluster (IPC) Replacement . 
Did you complete the replacement?

Go to Step 9

-

1. Use the scan tool in order to clear the DTC's.  

2. Operate vehicle within the conditions for 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2