P0304 Code won't clear
Thread Starter
Instructor
Joined: Feb 2017
Posts: 163
Likes: 55
P0304 Code won't clear
I got a P0304 code at a track event. The plug wire looked bad, so I replaced all plugs and plug wires with new AC Delco parts. 2011 Grand Sport.
I tried resetting the code with my Bosch ODB 1000 scan tool, but it appears it's not resetting the code. Even without restarting the engine, if I put the reader back on, it still shows the code. The reset code process appears to work, and it says "Done", but the code is still there.
Is there some special process on the Corvette to reset that code? I've used this reader before on other cars, and it has always reset the code. But I'm not having any luck with the Corvette.
Car runs great, so I think it just needs the code reset.
I tried resetting the code with my Bosch ODB 1000 scan tool, but it appears it's not resetting the code. Even without restarting the engine, if I put the reader back on, it still shows the code. The reset code process appears to work, and it says "Done", but the code is still there.
Is there some special process on the Corvette to reset that code? I've used this reader before on other cars, and it has always reset the code. But I'm not having any luck with the Corvette.
Car runs great, so I think it just needs the code reset.
Thread Starter
Instructor
Joined: Feb 2017
Posts: 163
Likes: 55
I found the problem. It won't reset the code in "Accessary" mode. You have to use the main ON button. Code reader claimed it was resetting the code in ACC mode, but it only worked in ON mode (with engine off).
