Cadillac CTS-V 2019 Owner's Manual page 128

Caution
Modifications to the engine,
transmission, exhaust, intake,
or fuel system, or the use of
replacement tires that do not meet
the original tire 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 0 241.
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 grades.
If towing a trailer, reduce the amount
of cargo being hauled as soon as
possible.
If the light continues to flash, find a
safe place to park. Turn the vehicle off
and wait at least 10 seconds before
restarting the engine. If the light is
still flashing, follow the previous
guidelines and see your dealer for
service as soon as possible.
If the light is on steady : A
malfunction has been detected.
Diagnosis and service may be
required.
Check the following:
If fuel has been added to the
vehicle using the capless fuel
funnel adapter, make sure that it
has been removed. See Filling the
Tank with a Portable Gas Can
under Filling the Tank 0 236. The
diagnostic system can detect if the
adapter has been left installed in
the vehicle, allowing fuel to
evaporate into the atmosphere.
A few driving trips with the
adapter removed may turn off the
light.
Poor fuel quality can cause
inefficient engine operation and
poor driveability, which may go
INSTRUMENTS AND CONTROLS
away once the engine is warmed
up. If this occurs, change the fuel
brand. It may require at least one
full tank of the proper fuel to turn
the light off.
See Recommended Fuel (LTG 2.0L
L4 Turbo Engine) 0 235 or
Recommended Fuel (LGX 3.6L
V6 Engine) 0 235 or Recommended
Fuel (LF3 3.6L V6 Twin Turbo and
LT4 6.2L V8 Engines) 0 236.
If the light remains on, see your
dealer.
Emissions Inspection and
Maintenance Programs
If the vehicle requires an Emissions
Inspection/Maintenance test, the test
equipment will likely connect to the
vehicle's Data Link Connector (DLC).
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