service CADILLAC CTS 2003 1.G Owner's Manual

2-92
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
NOTICE:
Modifications made to the engine, transmission,
exhaust, intake or fuel system of your vehicle or
the replacement of the original tires with other
than those of the same Tire Performance Criteria
(TPC) can affect your vehicle's emission controls
and may cause this light to come on.
Modifications to these systems could lead to
costly repairs not covered by your warranty. This
may also result in a failure to pass a required
Emission Inspection/Maintenance test.
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.

2-93
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
ªIf the Light Is On Steadyº 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 ªIf the Light
Is On Steadyº 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 ªFilling Your Tankº in the Index. 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.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
Are you low on fuel?
As your engine starts to run out of fuel, your engine may
not run as efficiently as designed since small amounts of
air are sucked into the fuel line causing a misfire. The
system can detect this. Adding fuel should correct this
condition. Make sure to install the fuel cap properly. See
ªFilling Your Tankº in the Index. It will take a few
driving trips to turn the light off.

2-94
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel. See
ªFuelº in the Index. Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start
-up, stalling when you
put the vehicle into gear, misfiring, hesitation on
acceleration or stumbling on acceleration. (These
conditions may go away once the engine is warmed up.)
This will be detected by the system and cause the light
to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least one
full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.Emissions Inspection and Maintenance Programs
Some state/provincial and local governments have or
may begin programs to inspect the emission control
equipment on your vehicle. Failure to pass this
inspection could prevent you from getting a vehicle
registration.
Here are some things you need to know in order to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the CHECK
ENGINE light is on or not working properly.
Your vehicle will not pass this inspection if the OBD
(on
-board diagnostic) system determines that critical
emission control systems have not been completely
diagnosed by the system. The vehicle would be
considered not ready for inspection. This can happen if
you have recently replaced your battery or if your
battery has run down. The diagnostic system is designed
to evaluate critical emission control systems during
normal driving. This may take several days of routine
driving. If you have done this and your vehicle still does
not pass the inspection for lack of OBD system
readiness, see your dealer or qualified service center to
prepare the vehicle for inspection.

2-95
Oil Pressure Light
CAUTION:
Don't keep driving if the oil pressure is low. If
you do, your engine can become so hot that it
catches fire. You or others could be burned.
Check your oil as soon as possible and have your
vehicle serviced.
NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by
your warranty.
This light tells you if there
could be a problem with
your engine oil pressure.
The light goes on when you turn your key to ON or
START. It goes off once you start your engine. That's a
check to be sure the light works. If it doesn't come on,
be sure to have it fixed so it will be there to warn you if
something goes wrong.
When the light comes on and stays on, it means that
oil isn't flowing through your engine properly. You
could be low on oil and you might have some other
system problem.

2-96
Sport Mode Light (If Equipped)
This light will come on
when the sport mode is
in use.
When you turn off the sport mode, the light will go out.
If it stays on, your vehicle may need service. See your
dealer. See ªSport Modeº listed previously in this
section for more information.
Winter Driving Mode Light (If Equipped)
This light will come on
when the winter driving
mode feature is in use.
When you turn off the winter driving mode feature, the
light will go out. If it stays on, your vehicle may need
service. See your dealer. See ªWinter Driving Modeº
listed previously in this section for more information.
Security Light
For information regarding
this light, see ªTheft
Deterrent
-Systemº listed
previously in this section.

2-109
Change Trans (Transmission) Fluid
This symbol appears
with the Change Trans
Fluid message.
This message indicates that the life of the transmission
fluid has expired and it should be changed within
200 miles. See ªMaintenance Scheduleº and
ªRecommended Fluids and Lubricantsº in the Index
for the proper fluid and change intervals.
When you reset the Change Trans Fluid message by
clearing it from the display, you still must reset the
transmission fluid life monitor separately. For more
information on resetting the transmission fluid life
monitor, see ªTransmission Fluid Life Monitor, How to
Resetº in the Index.Check Brake Fluid This symbol appears
with the Check Brake
Fluid message.
This message will display if the ignition is in ON to
inform the driver that the brake fluid level is low. Have
the brake system serviced by a technician as soon as
possible. See ªBrake System Warning Lightº in
the Index.

2-110
Check Coolant Level
This symbol appears
with the Check Coolant
Level message.
This message will appear when there is a low level of
engine coolant. Have the cooling system serviced by a
technician as soon as possible. See ªEngine Coolantº in
the Index for more information.
Check Gas Cap
This symbol appears
with the Check Gas
Cap message.
When this message appears on the display, the gas cap
has not been fully tightened. You should recheck the gas
cap to ensure that it's on and tightened properly.Check Washer Fluid
This symbol appears
with the Check Washer
Fluid message.
When this message appears on the display, it means that
your vehicle is low on windshield washer fluid. You
should refill the tank as soon as possible. See
ªWindshield Washer Fluidº in the Index for more
information.
Driver Door Ajar
This symbol appears
with the Driver Door
Ajar message.
When this message appears on the display, it means that
the driver's door was not closed completely. You should
make sure that the driver's door is closed completely.

2-116
Right Rear Door Ajar
This symbol appears
with the Right Rear Door
Ajar message.
When this message appears on the display, the right rear
door it means that the passenger's side rear door was not
closed completely. You should check to make sure that
the door is closed completely.Service AC (Air Conditioning) SystemThis symbol appears
with the Service AC
System message.
This message appears when the electronic sensors that
control the air conditioning and heating systems are no
longer working. Have the climate control system
serviced if you notice a drop in heating and air
conditioning efficiency.

2-117
Service Air Bag
This symbol appears
with the Service Air
Bag message.
There is a problem with the air bag system when this
message appears. Have your vehicle serviced by a
qualified technician at your dealership immediately.
See ªAir Bag Readiness Lightº in the Index for more
information.
Service Charging System
This symbol appears with
the Service Charging
System message.
This message will display when a problem with the
charging system has been detected. Have your vehicle
serviced at your dealership.Service Electrical System
This symbol appears with
the Service Electrical
System message.
This message will display if an electrical problem has
occurred within the Powertrain Control Module (PCM)
or the ignition switch. Have your vehicle serviced by
your dealership.
Service Fuel System
This symbol appears
with the Service Fuel
System message.
The Powertrain Control Module (PCM) has detected a
problem within the fuel system when this message
appears. Have your vehicle serviced by your dealership.

2-118
Service Idle Control
This symbol appears
with the Service Idle
Control message.
A problem with the idle control has occurred when this
message displays. Have your vehicle serviced by your
dealership.Service Stability Sys MessageThis symbol appears
with the Service Stability
System message.
Your vehicle may be equipped with a vehicle stability
enhancement system called Stabilitrak.
See ªStabilitrakº in the Index. The Service Stability Sys
message will be displayed if there has been a problem
detected with Stabilitrak (if equipped).
If the Service Stability Sys message comes on while you
are driving, pull off the road as soon as possible and stop
carefully. Try resetting the system by turning the
ignition off then back on. If the Service Stability Sys
message still stays on or comes back on again while you
are driving, your vehicle needs service. Have the
Stabilitrak system inspected as soon as possible.