Jeep Compass Operating Information Manual page 83

ONBOARD DIAGNOSTIC
SYSTEM — OBD II
Your vehicle is equipped with a sophisticated
Onboard Diagnostic system called OBD II. This
system monitors the performance of the emis-
sions, engine, and automatic transmission control
systems. When these systems are operating prop-
erly, your vehicle will provide excellent perfor-
mance and fuel economy, as well as emissions
well within current government regulations.
If any of these systems require service, the OBD
II system will turn on the Malfunction Indicator
Light (MIL). It will also store diagnostic codes
and other information to assist your service
technician in making repairs. Although your ve-
hicle will usually be drivable and not need
towing, see your authorized dealer for service
as soon as possible.
CAUTION!
• Prolonged driving with the MIL on could
cause further damage to the emission con-
trol system. It could also affect fuel
economy and driveability. The vehicle must
be serviced before any emissions tests can
be performed.
• If the MIL is flashing while the vehicle is
running, severe catalytic converter dam-
age and power loss will soon occur. Imme-
diate service is required.
80
Onboard Diagnostic System (OBD II)
Cybersecurity
Your vehicle is required to have an Onboard
Diagnostic system (OBD II) and a connection
port to allow access to information related to the
performance of your emissions controls. Autho-
rized service technicians may need to access
this information to assist with the diagnosis and
service of your vehicle and emissions system.
WARNING!
• ONLY an authorized service technician
should connect equipment to the OBD II
connection port in order to diagnose or
service your vehicle.
• If unauthorized equipment is connected to
the OBD II connection port, such as a
driver-behavior tracking device, it may:
• Be possible that vehicle systems, includ-
ing safety related systems, could be
impaired or a loss of vehicle control
could occur that may result in an acci-
dent involving serious injury or death.
• Access, or allow others to access, infor-
mation stored in your vehicle systems,
including personal information.
For further information, refer to "Cybersecurity"
in "Multimedia".
Loose Fuel Filler Cap Message
After fuel is added, the vehicle diagnostic sys-
tem can determine if the fuel filler cap is possibly
loose or improperly installed. A "gASCAP" mes-
sage will be displayed in the instrument cluster.
Tighten the gas cap until a "clicking" sound is
heard. This is an indication that the gas cap is
properly tightened. Push the trip odometer RE-
SET button to turn off the message. If the
problem persists, the message will appear the
next time the vehicle is started. This might
indicate a damaged cap. If the problem is de-
tected twice in a row, the system will turn on the
MIL. Resolving the problem will turn the MIL light
off.