Check Engine / Service Engine Soon / SES light

Todays GM vehicles use many sensor, switches, solenoids, and other  electrical
components to control or monitor every aspect of the engine.
From controlling the fuel and ignition systems, to monitoring the emissions.
A problem in any of these systems, or subsystems, can cause the check  engine light to
come on.

The first step in any diagnosis of the check engine light is to get the  computer (PCM or
ECM)
scanned for codes. Any time this warning comes  on, a code is stored in the
computer memory along with many data  parameters that were present at the time of the
fault.

A simple
code reader that can be purchased at any automotive supplier  can retrieve these
codes. Many of the large national parts store chains will  scan the system at no charge.
The code will give an indication as to what  system has / had a problem. The more
expensive scanners will also show  live data, and allow further diagnosis by being able to
control parts of a  particular system.
9-27-10
Service Engine Soon and
Traction Off lights are steadily on.
Comments
Many codes that turn on the check engine light,
will also tun on the Traction warning. Need to have
the engine computer (PCM) scanned-repaired first.
11-6-10
My Check Engine Light on my 1997 Check Engine Light will come on after ignition
is shut off.
The computer (PCM or ECM) is what controls the
check engine light. You may have a bad computer
or a shorted wire.
12-19-10
Yes, I have the same issue on my 1996 Lesabre. Check Engine Lite and Traction
Off... The car runs bad in town, but nice on the highway at 70 and above. Once
warmed up it is allot better... Any recommendation
It could be any numbers of problems. Spark plug,
plug wire,
ignition coil, fuel injector etc. The fist
step is to have the computer scanned for codes.
1-6-11
i got code p0455 were is the problem
P0455 is for a large EVAP system leak. Either the
gas cap is loose, not sealing, a line is leaking or
you may have a vent or purge solenoid problem.
1-29-11
i have a vehicle light with a wrench in middle  want to know what this means.
Sounds like you are describing the "Service
Vehicle" light. Either needs an oil change and get
it reset, or a problem in an body system  
component and needs the Body controller
scanned.
2-20-11
would hollowing out a
catalytic converter and the resonator i think its called then
putting the o2 sensors back in them make the check engine light come on a 1998
Subaru ej25 motor
5-27-11
sometimes my engine light blinks on and off when I'm driving but does not stay on
6-29-11
I get regular oil changes and tune ups so the other day when my check engine
light began flashing I didn't know what to think was wrong. It drives but when the
car sits idle it feels as if it wants to shut off (It doesn't) it shakes just a little until i
catch speed. I went to an auto parts store where he hooked it to a machine that
read Cylinder 1 but then he sold me an ignition coil, spark plugs and wires???? I
pray a simple coil replacement and tune up repair this problem. My friend had the
same issue with his Lexus truck and that regimen worked for him. I pray it works for
me as well.
The shaking you feel at idle is a cylinder that is
misfiring. Usually it is ignition related, so a coil or
new wires and plugs will most likely take care of it.
It can at times be a fuel injector problem, so if
your ignition repairs don't fix the problem, you
should look into that.
6-30-11
Thank you very much. I will try that
8-12-11
I have a 2007
Chevy Impala and the check engine light came on. The repair shop
said that i need a new secondary air pump and a control valve at a cost of appx.
$700.00. He said this is an emission control problem.  What damage does this do
to the engine.
11-13-11
i have an 01
Oldsmobile Alero that will not stay charged (battery) alternator good
had checked check engine light on. Any ideas
This problem is called a parasitic draw. Something
is staying powered on when the car is off and key
is removed. You would need an amp meter and
schematics to repair this. Removing fuses one at
a time until draw goes away is a good start.
12-25-11
Need help I have a 2005 Silverado on the dashboard have a light that reads a lock
light what can I do it doesn't want to start.
This is the security warning light. the truck is in
theft mode, that is why it won't start. You may
have a bad ignition cylinder housing or ignition
switch, of a faulty aftermarket remote start / alarm
system if your truck has one.
i have a Chevy Trailblazer 2007 model , yesterday it all of a sudden stopped
accelerating forward and not going in reverse. I switched off the car for some time.
It starting moving forward and backwards. Can you tell me where is the problem. I  
had a mechanic look at it , he says the gears are all gone and i need a
replacement .
Service engine soon light on. Will not scan on any code reader, just shuts them off
If the scanner shuts off, then either it is bad or the vehicle computer is bad or has
a shorted wire.
I have a 1999 S-10 Pickup truck, Jan 09 it totalled stalled out with the Service
Engine Light on spark plug wires, dist cap, rotor were all replaced, a year later
water pump, hose assembly pump replaced, light still coming on and off at random,
July 11 had all spark plug wires replaced dist cap, rotor etc replaced all this for
$1500 and the dang light still pops on, truck runs  with a little hesitation right
before the light comes on and then it will just go out for no reason, doing nothing
to make it go out, last suggestion was a new gas cap??? Any help would be great.
Your engine has a misfire. You need to get the
codes scanned in the computer to even guess
what may be wrong. One thing is for sure, it is
NOT the gas cap!
What does it mean when temperature icon goes on?  Also , overheating noticed.  I
put on my heat.  (Which does not work) but, the temp gage did cool down ?
Code readers of any kind will not get the codes to flash. Even the manual jumper
to get the codes to flash doesn't work. 94 S-10 V6 Vortec, new body style. In
general the truck runs fine, but it bothers me that I can't read the codes. What is
keeping the codes from being read?
If you cannot get the codes in any way, then you
may either have a communication circuit problem
between the computer and the diagnostic
connector or a bad PCM. If it is a bad PCM, then it
is just the a problem in that part of the computer,
and will not cause any problems with the way your
truck runs.
I have a 2004 Chevy Malibu. I got it checked and received a P0300 (random
misfire). I have the coil packs, spark plugs and boots changed. One week after, my
engine light came back on. It is not shaking like before. I am very disappointed as  
other place said the problem is the catalytic converter. I feel they should check the
fuel injector, fuel pressure and a possible vacuum leak. I think that because of a
random misfire, some unburned gas is now clogging the fuel injector. I am confuse
and feel can't trust anybody to work on my car.


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The Check Engine Light Explained