code 12 flashing as i drive

[Tony123]

I have my service engine light flashing code 12 when engine is run,driving or just with the key in the on postion???

[Johnny Mullet]

Do you happen to have the diagnostic jumper installed still? A code will only flash when being read by the jumper and a code 12 is normal operation.

[hvdragon]

Originally Posted by Johnny Mullet

Do you happen to have the diagnostic jumper installed still? A code will only flash when being read by the jumper and a code 12 is normal operation.

just right
Hey, Johnny, u make very good impression, man. Your opinions r always exact.

[Tony123]

No i dont have it still pluged in if i put the spare fuse in it will flash like what its doin now?

[Johnny Mullet]

If you install a spare fuse in the diag port, the codes will flash. Seems like there is some sort of problem if it's flashing with no fuse in the diag port.

Try disconnecting the battery for 10 minutes and see if it straightens out.

[Tony123]

You were rt their was a fuse in the port. i pulled it out and its not flashing anymore... THANKs! One more thing with my car its a 92 auto it seem to be starting off in 3rd?? Doesnt do it all the time,but when it does i have to shift it thru the gears to get it goin.she shifts fine......

[Johnny Mullet]

I am not totally familiar with the automatics, but have heard of your issue before. I think the valve body gets all gummed up and needs dropped out and cleaned if I am not mistaken. I can search around for more info if you need.

Driving it "manually" won't hurt it if you have to shift this way for now.

[Tony123]

That would be great..thanks for the help

[Johnny Mullet]

I did some research and the best I can tell you to try and save a few bucks would be to drop the pan, remove the valve body, disassemble it, clean it, and reassemble with a new filter. This has worked for some, but not other people.