Answer:
These vehicles do not have a routine service light
or indicator, nor does it use the service engine
light for that purpose. I assume the scanner is
working properly and has been checked on  
another vehicle for its function.
To clarify, is this the
service ENGINE light, or the
service VEHICLE light?
2000 CHEVY MONTE CARLO 3800 V6.
SERVICE ENGINE SOON codes =  A SCAN
FOUND NO CODES
Repairs done prior = ENGINE WAS CLEANED,
FRONT HUB ASSEMBLIES  WERE CHANGED.

Question = THE SERVICE ENGINE SOON
LIGHT IS ON, BUT THERE ARE NO TROUBLE
CODES SHOWING UP ON THE SCAN TOOL. I
AM THINKING THIS IS THE REMINDER. TO
HAVE THE ROUTINE SERVICE DONE. HOW IS
THIS RESET?
Question: I have a 2001 Monte carlo and my interior lights won't
cut off unless i disconnect the battery. It runs my battery down.
Answer:
I've seen many problems like the one you're having with your car.
What's happening is that the Body Control Module has an
internal failure or short and is keeping certain electrical circuits
powered up. You will need to have the Body Control Module
replaced. It is located under the dash on the left side. You must
have this repair performed at a dealership because it will need to
be programmed and set up to your particular vehicle. A regular
repair shop cannot do this.
Chevy Monte Carlo Service Light

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Question: 2001 Chevy Monte Carlo SS service vehicle soon
message appeared and went away. Curious what caused it.

Mechanic: That light usually comes on for an ABS or Traction
problem, or the body control module sees a problem. The only
way to tell is to get the body control module scanned for codes.

Okay. It happened after the car wouldn't start after a couple tries,
despite starter working fine. Then it started and showed the
message. Drove a couple miles, stopped, started again just fine
without code. Think its just a glitch?

Hmm. it may be that the Body control module (BCM) saw a
problem in the anti-theft system. That might also explain why the
car did not start.

Ooohhh. Well that sucks. Electrical issues can be difficult
sometimes. Thanks for the info! Just was hoping my engine
wasn't going to explode soon or something ?

No, not explode. But, you may start having more problems with
the anti-theft system. Just search our site for "passlock" and you
should find several articles about the common problems.

Okay thats good to know, I will most certainly do that.
VISITOR:
It is the "service vehicle soon" message. Thanks.

Answer:
There are many different computer systems on todays cars. The
service  ENGINE indicator is strictly powertrain computer related.
Service VEHICLE  codes are stored in the body control module.
The service VEHICLE indicator can be caused by several different
systems. Anything from vehicle  lighting, to theft system, to body
control module(BCM) to
ABS (but usually an ABS light as well),
powertrain non-emissions related codes, or  communications
problems between any of these computers.

Most inexpensive scanners only read the powertrain computer. In
order to  read codes that set a service VEHICLE light, you would
need a higher level scanner that can read BCM codes, as well as
ABS and others if needed. About the only thing that can be done
without having the BCM scanned is  to be sure to check all fuses.

VISITOR:
THE RADIO WORKED FINE UNTIL I CHANGED THE
BATTERY. NOW IT IS LOCKED. HOW DO I UNLOCK IT.

Answer:
With a radio replacement, this may very well be the cause of your
service vehicle  light. After replacing a radio, the system must be
set up with a dealer scanner. Audio system option, VIN #, etc,
need to be set up in the radio and the BCM. If not done, this will
cause several different body codes, and is  most likely the cause
of your
service vehicle light.
If the radio just displays LOC, then you need a
Radio Unlock
Code.