Cadillac 2004 DeVille Owner's Manual page 190

CHECK GAS CAP – 61: This message will appear if
the gas cap has not been fully tightened. You should
recheck your gas cap to ensure that it is on properly.
CHECK OIL LEVEL – 36: For correct operation of the
low oil sensing system, your vehicle should be on a
level surface. A false CHECK OIL LEVEL message may
appear if the vehicle is parked on a grade. The oil
level sensing system does not check for actual oil level
if the engine has been off for a short period of time,
and the oil level is never checked while the engine is
running. If the CHECK OIL LEVEL message appears,
and your vehicle has been parked on level ground
with the engine off for at least 30 minutes, the oil level
should be checked by observing the oil dipstick. Prior to
checking the oil level, be sure the engine has been
off for a few minutes and your vehicle is on a level
surface. Then check the dipstick and add oil if
necessary. See Engine Oil on page 5-14.
CHECK TIRE PRESSURE – 144: This message is
displayed when the Tire Pressure Monitor (TPM) system
detects a low or high tire pressure condition in one or
more of the road tires. By pressing the INFO button
up or down, the DIC display will show which tire or tires
do not have the correct inflation pressure. A "LOW
TIRE" condition exists when the tire's air pressure is
under 25 psi (172 kPa) and a "HIGH TIRE" condition
exists when the tire's air pressure is above 38 psi
(262 kPa). The system will display the air pressure, the
tire location (LF, RF, RR or LR) and if the air pressure
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is low or high. The tire pressure information is available
in English or metric measurements. For example, a
driver's side front tire that is low may be shown
as: 22 PSI LF TIRE LOW.
The correct tire inflation pressure should be set to those
shown on the Tire Loading-Information Label, located on
the rear edge of the driver's door. For more information
regarding proper tire inflation, see Inflation - Tire
Pressure on page 5-68. If a tire is low, you should stop as
soon as possible and inspect your tire(s) for damage. If a
tire is flat, see If a Tire Goes Flat on page 5-78.
Once the TPM system detects the low or high tire
pressure condition, the message CHECK TIRE
PRESSURE will be displayed whenever you start the
engine. To remove or clear the CHECK TIRE
PRESSURE message, you will need to set the tire(s) to
the proper tire pressure. See Inflation - Tire Pressure on
page 5-68.