No SES light when key is "on"
Thread Starter
Heel & Toe
Joined: Sep 2022
Posts: 22
Likes: 2
No SES light when key is "on"
This is my first post on here, so hello everyone.
Q: I've been reading a lot on these forums and have basically come to the conclusion that if the SES light does not come on when the key is turned to the "on" position, then there may be a problem. I haven't been able to find a clear answer anywhere on the Internet to what this means or what the problem may be. Some people have mentioned that it could be something wrong with the ECM.
Additional Info:
I recently bought a 1990 Corvette, knowing that it wasn't running 100%, but have been getting closer and closer. The first problem that i discovered was that the cats were very backed up. I tore all of them out and it picked up a lot of power. The next thing was the EGR. I replaced it and it made a huge difference in the motor's performance. As of now, cold starts are a little difficult and the motor just seems to run a little rough at idle and when revved up to around 2k (above that it feels smooth). It starts up must faster on when warm. It seems that sometimes when I start it, it will run better than other times.
Also the SES light does definitely work, as it was throwing the code for the EGR a little while back.
Any info on this will be great. Thank you!
Q: I've been reading a lot on these forums and have basically come to the conclusion that if the SES light does not come on when the key is turned to the "on" position, then there may be a problem. I haven't been able to find a clear answer anywhere on the Internet to what this means or what the problem may be. Some people have mentioned that it could be something wrong with the ECM.
Additional Info:
I recently bought a 1990 Corvette, knowing that it wasn't running 100%, but have been getting closer and closer. The first problem that i discovered was that the cats were very backed up. I tore all of them out and it picked up a lot of power. The next thing was the EGR. I replaced it and it made a huge difference in the motor's performance. As of now, cold starts are a little difficult and the motor just seems to run a little rough at idle and when revved up to around 2k (above that it feels smooth). It starts up must faster on when warm. It seems that sometimes when I start it, it will run better than other times.
Also the SES light does definitely work, as it was throwing the code for the EGR a little while back.
Any info on this will be great. Thank you!
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
Turn the key one more click and see what happens. Your engine needs to be on "Run" position to see the codes,
Melting Slicks
Joined: Jul 2008
Posts: 2,269
Likes: 142
From: Ottawa Ontario
Are other lights coming on in the display? If so, the SES light bulb may be burnt out or a previous owner may have removed it if it was on and they didn't want to fix the issue causing it.
Thread Starter
Heel & Toe
Joined: Sep 2022
Posts: 22
Likes: 2
Sorry, I guess I did mean to say the "run" not the "on" position.
So I went to check what lights were on the dash when the key was turned to "run", and for the first time since owning the car, the SES came on. Weird coincidence I guess.
If it continues to appear, then great, but if not, I think it could be related to what you were saying about the airbag. Since owning the car, the seatbelt light has belt illuminated. I think I read somewhere on here that the seatbelt light also lights up when there is a problem with the airbag. Also, the INFL REST light has never come on before.
I will check back with ya'll if anything changes. Thanks everyone for the help so far.
So I went to check what lights were on the dash when the key was turned to "run", and for the first time since owning the car, the SES came on. Weird coincidence I guess.
If it continues to appear, then great, but if not, I think it could be related to what you were saying about the airbag. Since owning the car, the seatbelt light has belt illuminated. I think I read somewhere on here that the seatbelt light also lights up when there is a problem with the airbag. Also, the INFL REST light has never come on before.
I will check back with ya'll if anything changes. Thanks everyone for the help so far.
