Hummer H2. Manual - part 1159

DTC P0562 

Circuit Description 

The PCM monitors the system voltage to make sure that the voltage stays within the proper range. If the PCM 
detects an excessively low system voltage, DTC P0562 will set. 

When the charging system detects a fault, the instrument panel cluster (IPC) displays a message or the charge 
indicator will light. 

Conditions for Running the DTC 

z

Engine run time more than 20 seconds and above 1200 RPM.  

z

Vehicle speed above 8 km/h (5 mph).  

Conditions for Setting the DTC 

The PCM detects an improper voltage below 11 volts for 5 seconds. 

Action Taken When the DTC Sets 

z

The PCM stores the DTC information into memory when the diagnostic runs and fails.  

z

The PCM will store conditions which were present when the DTC set as Failure Records data only.  

z

The PCM disables most outputs.  

z

The transmission defaults to a predetermined gear.  

z

The torque converter clutch (TCC) operation is inhibited.  

z

The instrument panel cluster (IPC) displays a message.  

z

The malfunction indicator lamp (MIL) will not illuminate.  

Conditions for Clearing the DTC 

z

The Conditions for Setting the DTC are no longer present.  

z

A history DTC will clear after 40 malfunction free ignition cycles.  

z

The powertrain control module (PCM) receives the clear code command from the scan tool. 

Replace the module setting the code. Refer to Control 
Module References in Body Control System.Did you 
complete the replacement?

Go to 

Step 5

-

5

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 ELECTRICAL Engine Electrical - Hummer H2

  

DTC P0562 

DTC P0563 

Step

Action

Value

(s)

Yes

No

Schematic Reference:Starting and Charging Schematics 
Connector End View Reference: Engine Electrical Connector End Views

1

Did you perform the Engine Electrical Diagnostic System 
Check?

-

Go to 

Step 2

Go to Diagnostic 

System Check - Engine 

Electrical

2

With the scan tool monitor the Ignition 1 signal voltage in 
the PCM data list. 
Does the scan tool display Ignition 1 voltage greater than 
the specified value?

11 V

Go to 

Step 4

Go to Step 3

3

Test the ignition feed circuit to the PCM for high 
resistance or open. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to 

Step 7

Go to Step 5

4

1. Inspect for poor connections at the PCM. Refer to 

Testing for Intermittent Conditions and Poor 
Connections in Wiring Systems.  

2. If you find a poor connection, repair the condition 

as necessary. Refer to Wiring Repairs in Wiring 
Systems.  

Did you find and correct the condition?

-

Go to 

Step 7

Go to Step 6

5

Repair the ignition feed circuit to the PCM for an open or 
a short to ground. Refer to Wiring Repairs in Wiring 
Systems. 
Is the action complete?

-

Go to 

Step 7

-

6

Replace the PCM. Refer to Powertrain Control Module 
(PCM) Replacement in Engine Controls.Is the action 
complete?

IMPORTANT:

The replacement PCM must be programmed.

-

Go to 

Step 7

-

7

1. Select the Diagnostic Trouble Code (DTC) option 

and the Clear DTC Information option using the 
scan tool.  

2. Operate the vehicle within the Conditions for 

Running the DTC as specified in the supporting 
text, if applicable.  

Does the DTC reset?

-

Go to 

Step 2

System OK

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2

  

Circuit Description 

The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper 
range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition 
may cause a stalling condition or other driveability concerns. 

Conditions for Running the DTC 

z

The engine run time is more than 20 seconds.  

z

Engine running above 1200 RPM.  

z

Vehicle speed above 8 km/h (5 mph).  

Conditions for Setting the DTC 

z

The PCM senses the system voltage is above 19 volts.  

z

All of the conditions are present for 5 seconds.  

Action Taken When the DTC Sets 

z

The PCM stores DTC P0563 in the PCM memory when the diagnostic runs and fails.  

z

The PCM will record the operating conditions at the time the diagnostic fails. The PCM stores this 
information in Failure Records.  

z

The PCM disables most outputs.  

z

The transmission defaults to a predetermined gear.  

z

The torque converter clutch (TCC) operation is inhibited.  

z

The instrument panel cluster (IPC) displays a message.  

z

The malfunction indicator lamp (MIL) will not illuminate.  

Conditions for Clearing the DTC 

z

The Conditions for Setting the DTC are no longer present.  

z

A history DTC will clear after 40 malfunction free ignition cycles.  

z

The Powertrain Control Module (PCM) receives the clear code command from the scan tool.  

DTC P0563 

Step

Action

Value

(s)

Yes

No

Schematic Reference:Starting and Charging Schematics 
Connector End View Reference: Engine Electrical Connector End Views

1

Did you perform the Engine Electrical Diagnostic 
System Check?

-

Go to 

Step 2

Go to Diagnostic System 

Check - Engine 

Electrical

1. Turn OFF all the accessories.  

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2

  

DTC P0615 

Circuit Description 

The PCM uses Output Driver Modules (ODMs) to control many functions of the engine. The ODMs supply the 
ground path for the PCM controlled device when the PCM commands the device ON. Each ODM is able to 
control several outputs. The PCM monitors the ODMs for circuit conditions that are incorrect for the 
commanded state of the ODM. If the PCM detects an improper circuit condition in the ODM that controls the 
starter relay, DTC P0615 will set. 

Conditions for Running the DTC 

System voltage is between 8-16 volts. 

Conditions for Setting the DTC 

z

The PCM detects an improper voltage level on the output circuit that controls the starter relay.  

z

The condition exists for at least 2 seconds.  

Action Taken When the DTC Sets 

z

The PCM will not illuminate the Malfunction Indicator Lamp (MIL). 

2

2. Measure the battery voltage at the battery using 

the DMM.  

3. Operate the engine speed above 2000 RPM.  

Is the battery voltage less than the specified value?

19 V

Go to 

Step 4

Go to Step 3

3

Replace the generator. Refer to Generator 
Replacement . 
Is the action complete?

-

Go to 

Step 5

-

4

Replace the PCM. Refer to Powertrain Control 
Module (PCM) Replacement in Engine Controls.Is 
the action complete?

IMPORTANT:

The replacement PCM must be programmed.

-

Go to 

Step 5

-

5

1. Select the Diagnostic Trouble Code (DTC) 

option and the Clear DTC Information option 
using the scan tool.  

2. Operate the vehicle within the Conditions for 

Running the DTC as specified in the supporting 
text, if applicable.  

Does the DTC reset?

-

Go to 

Step 2

System OK

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2