Cadillac ATS 2017 Owner's Manual page 123

122 INSTRUMENTS AND CONTROLS
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:
For vehicles without the capless
fuel system, a loose or missing
fuel cap may cause the light to
come on. See Filling the Tank
0 273. A few driving trips with the
cap properly installed may turn
the light off.
For vehicles with the capless fuel
system, if fuel has been added to
the vehicle using the capless
funnel adapter, make sure that it
has been removed. See Filling the
Tank with a Portable Gas Can
under Filling the Tank 0 273. 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
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 Fuel 0 271.
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).
The DLC is under the instrument
panel to the left of the steering wheel.
Connecting devices that are not used
to perform an Emissions Inspection/
Maintenance test or to service the
vehicle may affect vehicle operation.
See Add-On Electrical Equipment 0 280.
See your dealer if assistance is needed.
The vehicle may not pass
inspection if:
The light is on when the engine is
running.
The light does not come on when
the ignition is in Service
Only Mode.