Malfunction Indicator Lamp; Check Engine Light - Hummer H2 2004 Owner's Manual

Notice: If you drive your vehicle with the
transmission temperature gage above normal
operating range, you can damage the transmission.
This could lead to costly repairs that would not
be covered by your warranty. Do not drive your
vehicle while the transmission temperature gage
reading is above normal. See your dealer for service.
The following situations can cause the transmission to
operate at higher temperatures:
•
Towing a trailer,
•
hot outside air temperatures,
•
hauling a large or heavy load,
•
low transmission fluid level,
•
high transmission fluid level,
•
restricted air flow to the radiator.
A temporary solution to hotter transmission operating
temperatures may be to let the transmission cool down.
If the transmission is operated at higher temperatures
on a frequent basis, see Scheduled Maintenance
on page 6-4 for the proper transmission
maintenance intervals.

Malfunction Indicator Lamp

Check Engine Light

This system is called OBD II (On-Board
Diagnostics-Second Generation) and is intended to
assure that emissions are at acceptable levels for the
life of the vehicle, helping to produce a cleaner
environment. The check engine light comes on to
indicate that there is a problem and service is required.
Malfunctions often will be indicated by the system
before any problem is apparent. This may prevent more
serious damage to your vehicle. This system is also
designed to assist your service technician in correctly
diagnosing any malfunction.
Your vehicle is equipped
with a computer which
monitors operation of the
fuel, ignition, and emission
control systems.
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