Hummer H3. Manual — part 1129

Conditions for Clearing the DTC

The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System Connector End Views

Electrical Information Reference

Charging System Test

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List for EBCM

Diagnostic Aids

A possible cause of this DTC could be overcharging with a battery charger or jump starting.

A high voltage value in multiple modules indicates a concern in the charging system.

Circuit/System Verification

1. If the DTC is history, refer to Charging System Test.

2. Start the engine. Record the voltage at the battery terminals. Observe the battery voltage

signal parameter in the EBCM data list. Voltages should not differ by more than 1 volt.

If more than 1 volt, replace the EBCM.

Repair Procedures

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming

DTC P0562

Circuit Description

The powertrain control module (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.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0562 System Voltage Low

Conditions for Running the DTC

Engine run time is more than 20 seconds and above 1,200 RPM.

Vehicle speed is 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

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

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

The PCM disables most outputs.

The transmission defaults to a predetermined gear.

The torque converter clutch (TCC) operation is inhibited.

The IPC displays a message.

The malfunction indicator lamp (MIL) will not illuminate.

Conditions for Clearing the DTC

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

The Conditions for Setting the DTC are no longer present.

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

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

DTC P0562

Step

Action

Values

Yes

No

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

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

2

With the scan tool monitor the
ignition 1 signal voltage in the
powertrain control module (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 .
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 .

2. If you find a poor connection,

repair the condition as
necessary. Refer to Wiring
Repairs .

Did you find and correct the
condition?

-

Go to Step 7 Go to Step 6

Repair the ignition feed circuit to the

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

DTC P0563

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.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0563 System Voltage High

Conditions for Running the DTC

The engine run time is more than 20 seconds.

The engine is running above 1,200 RPM.

Vehicle speed is above 8 km/h (5 mph).

Conditions for Setting the DTC

The PCM senses the system voltage is above 19 volts.

All of the conditions are present for 5 seconds.

5

PCM for an open or a short to ground.
Refer to Wiring Repairs .
Is the action complete?

-

Go to Step 7

-

6

Replace the PCM. Refer to Control
Module References for replacement,
setup and programming.
Did you compete the replacement?

-

Go to Step 7

-

7

1. Select the 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

2007 Hummer H3

2007 ENGINE Engine Electrical - H3