Malfunction Indicator Lamp; (Check Engine Light) - Cadillac CTS Owner's Manual

the engine is started. For vehicles with
a reconfigurable cluster, this light may
not come on when the ignition is
turned on.
If the light stays on, or comes on
while driving, there may be a problem
with the electrical charging system.
Have it checked by your dealer.
Driving while this light is on could
drain the battery.
When this light comes on, or is
flashing, the Driver Information
Centre (DIC) also displays a message.
See Battery Voltage and Charging
Messages 0 135.
If a short distance must be driven
with the light on, be sure to turn off
all accessories, such as the radio and
air conditioner.

Malfunction Indicator Lamp

(Check Engine Light)

This light is part of the vehicle's
emission control on-board diagnostic
system. If this light is on while the
engine is running, a malfunction has
been detected and the vehicle may
require service. The light should come
on to show that it is working when
the ignition is in Service Only Mode.
See Ignition Positions 0 193.
Malfunctions are often indicated by
the system before any problem is
noticeable. Being aware of the light
and seeking service promptly when it
comes on may prevent damage.
Caution
If the vehicle is driven continually
with this light on, the emission
control system may not work as
well, the fuel economy may be
lower, and the vehicle may not run
smoothly. This could lead to costly
repairs that might not be covered
by the vehicle warranty.
INSTRUMENTS AND CONTROLS
Caution
Modifications to the engine,
transmission, exhaust, intake,
or fuel system, or the use of
replacement tyres that do not meet
the original tyre specifications, can
cause this light to come on. This
could lead to costly repairs not
covered by the vehicle warranty.
This could also affect the vehicle's
ability to pass an Emissions
Inspection/Maintenance test. See
Accessories and Modifications 0 248.
If the light is flashing : A
malfunction has been detected that
could damage the emission control
system and increase vehicle
emissions. Diagnosis and service may
be required.
To help prevent damage, reduce
vehicle speed and avoid hard
accelerations and uphill gradients.
If towing a trailer, reduce the amount
of cargo being hauled as soon as
possible.
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