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Jim Grant's Tech Tips
'97 Chevy Tahoe, Resetting "Service Engine Soon" Light
Q:
How do
you clear or reset the Service Engine Soon Light on a ’97 Chevy Tahoe?
- Charles C.
A:
There are
three ways to clear or reset the Service Engine Soon light in your vehicle
as well as most others. 1; with a computer scan tool. The software in
the scan tool allows for turning the Service Engine Soon light off. While
you’re having that performed, have the technician record the code/reason
for the warning light being on, there may be a system problem that needs
to be addressed. 2; disconnect the battery. Disconnecting the battery
causes the computer to lose all its memory. The only problem there is
you will not know why the warning light was on. 3; drive the vehicle.
The warning light comes on if there is a system problem or if the key
was in the on position and a computer sensor was disconnected. Just about
every time you start the engine and drive your vehicle, the computer runs
a series of system tests, this is called a drive cycle. Before the computer
will turn off the warning light the vehicle and computer have to go through
3 drive cycles. If the computer has determined that there is not a system
problem after 3 drive cycles of testing the light will be turned off.
After about 50 drive cycles the computer will remove/delete the code that
it stored. If after 3 or 4 days of driving the service engine soon light
has not turned off then you may very well have a problem that needs to
be addressed.
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