Reseting SES Light
09-17-2003, 07:29 PM
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Reseting SES Light Does anyone konw how to reset the service engine soon light on the dash?.....the car is running fine....i think its due to a small overflow of gas the other day, however i need to get the car inspected ASAP so if anyone konws how to reset it please let me konw....thanks
09-18-2003, 08:32 AM
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Re: Reseting SES Light I dont know about these cars, but on my 2002 z71 All I had to do was disconect the battery for about 10 mins. and that would reset it, however if there is a problem the SES light will come on again. Also this will reset all of your stations on your radio. Good Luck.
09-18-2003, 01:55 PM
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Re: Reseting SES Light This came from that other ls1 board hehe... hope this helps
Instructions on How to Reset the LS1 ECM
Submitted by: Scott Harroff
This is intended to reset that aggravating 'Service Engine Soon' light so many of us seem to see. The light is normally set due to a loose gas cap or a high frequency error on the mass air flow sensor in front of the intake manifold. If the light persists, you may want to have you car checked by a GM dealer. It may be a good idea to remove your K&N air filter, and replace it with the stock filter or equivalent before your visit to the dealer. Dealers, in the past, have been known to blame the MAS error on excessive oil in the K&N leaking onto the MAS. If the fuses aren't removed in this procedure, the codes will be stored in the ECM until the fuses are removed, or the dealer clears them with a scan tool. Rumors have it that stored codes retard timing and spark ignition which will hender the performance of you LS1.
1. Turn key on but don't start car.
2. Pull PCM BAT and PCM IGN fuses in engine compartment.
3. Wait a few minutes.
4. Turn ignition off.
5. Replace fuses.
It will take the car a while to relearn the fuel and timing curves so don't worry about a temporary performance loss.
Instructions on How to Reset the LS1 ECM
Submitted by: Scott Harroff
This is intended to reset that aggravating 'Service Engine Soon' light so many of us seem to see. The light is normally set due to a loose gas cap or a high frequency error on the mass air flow sensor in front of the intake manifold. If the light persists, you may want to have you car checked by a GM dealer. It may be a good idea to remove your K&N air filter, and replace it with the stock filter or equivalent before your visit to the dealer. Dealers, in the past, have been known to blame the MAS error on excessive oil in the K&N leaking onto the MAS. If the fuses aren't removed in this procedure, the codes will be stored in the ECM until the fuses are removed, or the dealer clears them with a scan tool. Rumors have it that stored codes retard timing and spark ignition which will hender the performance of you LS1.
1. Turn key on but don't start car.
2. Pull PCM BAT and PCM IGN fuses in engine compartment.
3. Wait a few minutes.
4. Turn ignition off.
5. Replace fuses.
It will take the car a while to relearn the fuel and timing curves so don't worry about a temporary performance loss.
09-18-2003, 03:18 PM
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Re: Reseting SES Light
Just reset the ECM. ??? 
I still say disconnect the battery.
I still say disconnect the battery.
Why would you want to disconnect the Battery for 10 minutes when it takes you 2 minutes to reset your ECM. I have done it several times and it works. I still say reset the ECM.
09-18-2003, 04:51 PM
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Re: Reseting SES Light How do i resset the ecm....do the instructions above work?....a friend of mine said he tried them and they didnt work...how long do you have to wait after disconecting the fuses?
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09-18-2003, 05:58 PM
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Re: Reseting SES Light Alright i reset the ecm and it went away....it says that you will have a performance loss....does that mean that it seems like it is about to stahl...and doesnt run or sound strong for about 15 mins because that happened but it seems to be alright now
