Hummer H2. Manual — part 228

The PCM/ECM detects that the engine is overspeed and that the fuel shutoff has been activated.

Low Speed

The PCM/ECM detects that the vehicle speed is less than 37 km/h (23 mph) while the cruise control
system was enabled.

Low Voltage

The PCM/ECM detects that the ignition voltage is below 9 volts.

Manual/Neutral

The PCM/ECM detects that transmission is in Neutral, Reverse or Park.

Memory Corrupt

An internal PCM/ECM memory fault is detected.

MPH Limit

The PCM/ECM detects a that the vehicle is overspeed and that the fuel shutoff has been activated.

No History

This parameter is displayed when a new PCM/ECM has been installed.

None

This parameter is displayed when a new PCM/ECM has been installed.

Off

The PCM/ECM detects that the cruise On/Off switch was turned to Off when the cruise control system
was enabled.

Over Set Speed

This parameter is displayed when the current vehicle speed is greater than the set vehicle speed by more
than a calibrated amount.

Over Speed

This parameter is displayed when the current vehicle speed is greater than the set vehicle speed by more
than a calibrated amount.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

Over Speed Tap

This parameter is displayed when the Set/Coast switch is briefly applied while the current vehicle speed is
greater than the set vehicle speed by more than a calibrated amount.

Pedal Initialize

The PCM/ECM detects that a stop lamp pedal activation had not occurred before the cruise control
system was requested.

PCM Error

The PCM/ECM detects that a cruise control software execution error is present.

PCM Inhibit

The PCM/ECM detects a RAM corruption associated to the cruise control system.

Pedal > Cruise

The PCM/ECM detects that the accelerator pedal overrides the set vehicle speed for approximately 60
seconds.

Serial Data

A fault in the serial data circuit from the cruise control switch to the platform module is detected.

S/C On, CC Off

When the PCM/ECM detects that the cruise set/coast signal is active and the throttle blade fully closes the
cruise control system will disengage until the PCM/ECM detects that the set/coast signal is inactive. The
cruise control system will then engage and set with the new vehicle speed.

S/C On - Speed High

This parameter is displayed when the Set/Coast switch is briefly applied while the current vehicle speed is
greater than the set vehicle speed by more than a calibrated amount.

Stop Lamp Switch

The PCM/ECM detects that the stop lamps have been activated.

TAC Inhibit

The PCM/ECM detects a fault within the TAC system.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

Traction

The PCM/ECM detects that the traction control system had been activated. It is also possible that a tire
with low air pressure can also set this disengagement reason.

Traction Loss

The PCM/ECM detects that the traction control system had been activated. It is also possible that a tire
with low air pressure can also set this disengagement reason.

Two Commands

The PCM/ECM detects that the Set/Coast switch and the Resume/Accel switch are active at the same
time.

Two CC Commands

The PCM/ECM detects that the Set/Coast switch and the Resume/Accel switch are active at the same
time.

Under Speed

The PCM/ECM detects that the vehicle speed is less than the cruise memory speed by more than a
calibrated amount.

Under Set Speed

The PCM/ECM detects that the vehicle speed is less than the cruise memory speed by more than a
calibrated amount.

DIAGNOSTIC TROUBLE CODE (DTC) LIST

Diagnostic Trouble Code (DTC) List

DTC

Diagnostic Procedure

Module(s)

CXXX

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

Electronic Brake Control Module
(EBCM)

P0502 DTC P0502

Powertrain Control Module
(PCM)

P0503 DTC P0503

Powertrain Control Module
(PCM)

P0567 DTC P0567

Powertrain Control Module
(PCM)

P0568 DTC P0568

Powertrain Control Module
(PCM)

P0719 DTC P0719

Powertrain Control Module

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

DTC P0567

Circuit Description

The cruise control resume/accel switch is an input to the throttle actuator control (TAC) module. The TAC
module uses the cruise control resume/accel switch signal circuit in order to detect when the driver has
requested to accelerate the set vehicle speed or to resume the cruise control system. The TAC module detects a
voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. The TAC
module sends a serial data signal to the PCM via the UART serial data circuit. This DTC sets if the PCM
receives a serial data signal from the TAC module indicating that voltage is present on the cruise control
resume/accel switch signal circuit for longer than 90 seconds.

Conditions for Running the DTC

z

The ignition is ON.

z

The cruise control switch is ON.

Conditions for Setting the DTC

The PCM receives a serial data signal from the TAC module indicating that the resume/accel switch is applied
for longer than 90 seconds.

Action Taken When the DTC Sets

z

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

z

The malfunction indicator lamp (MIL) will not illuminate.

z

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

z

The cruise control system is disabled.

Conditions for Clearing the MIL/DTC

z

A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.

z

A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other
emission related diagnostic.

z

Use a scan tool in order to clear the MIL/DTC.

(PCM)

P0724 DTC P0724

Powertrain Control Module
(PCM)

P1574 DTC P1574

Powertrain Control Module
(PCM)

PXXX

Diagnostic Trouble Code (DTC) List in Engine Controls-
4.8 L, 5.3 L, and 6.0 L.

Powertrain Control Module
(PCM)

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2