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GMC 2003 Envoy XL - If the Light Is Flashing; If the Light Is on Steady

GMC 2003 Envoy XL
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This light should come on, as a check
to
show you it is
working, when the ignition is
on
and the engine
is
not running. If the light doesn’t come on, have it
repaired. This light will also come on during a
malfunction in one of two ways:
Light Flashing
-
A misfire condition has been
detected.
A
misfire increases vehicle emissions
and may damage the emission control system on
your vehicle. Dealer or qualified service center
diagnosis and service may be required.
Light
On
Steady
-
An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis
and service may be required.
If
the Light
Is
Flashing
The following may prevent more serious damage
to
your vehicle:
Reducing vehicle speed.
Avoiding hard accelerations.
Avoiding steep uphill grades.
If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If the light stops flashing and remains on steady,
see
“If
the Light
Is
On Steady” following.
If the light continues
to
flash, when it is safe
to
do
so,
stop
the vehicle. Find a safe place
to
park your vehicle.
Turn the key
off, wait at least
10
seconds and restart
the engine. If the light remains on steady, see
“If the Light
Is
On Steady” following.
If
the light is still
flashing, follow the previous steps, and drive the vehicle
to
your dealer or qualified service center for service.
If
the Light
Is
On Steady
You
may be able
to
correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If
so,
reinstall the fuel cap, making sure to fully install
the cap. See Filling
Your
Tank on page
5-7.
The
diagnostic system can determine
if
the fuel cap has
been left
off or improperly installed.
A
loose or missing
fuel cap will allow fuel
to
evaporate into the atmosphere.
A
few driving trips with the cap properly installed
should turn the light
off.
3-42

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