It could low voltage. I had that code pop up the other day and I also haven't disconnected the battery lately. It went away after a day and hasn't popped back up yet. I don't have my book handy right now, but a code 12 (IIRC) also has to do with the PCM not getting enough power.ABN146 said:I have never disconnected the battery but I am getting MIL code 12 or battery disconnect.
97 XJ 4.0
It could be causing the code 12, but I don't think it would cause the others. Since you are replacing it anyway, it never hurts just to see if it really could be.ABN146 said:After reading Starscream918's post last night I wondered if a battery that is gettting old and not performing well could cause all of my problem codes. I plan to have it checked first before replacing sensors.
Not that I've ever heard of. That just sounds like a faulty guage or maybe a failing part within the gas tank.Would a battery or connection problem cause my fuel gauge to act up? As I drive it moves from full to empty once in awhile sometimes it stops on half when I know the tank is full.
xjohnnyc said:You will ALWAYS get a code 12. It signifies the beginning of the code sequence. And a code 55 signifies the end of the sequence.
Matthew Currie said:Sorry, but this is not so, at least for OBDI and OBDII systems that still do the flashing-light codes. 55 is the only code you should get normally. Code 12 is battery disconnect within the last 50 starts. If you have not had a disconnect, you should not get a 12.
If ABN146 had a battery connection bad enough to set code 12 while he was running, all sorts of other signals will be interrupted as well, and it can easily explain the others.
http://www.partsamerica.com/Product...YN&mfrpartnumber=LCS425C&parttype=178&ptset=AABN146 said:Well... I checked on pos battery cables and I was told I would have to go to the dealer for one.
The dealer price is just above $100.00!!
I
xjohnnyc said:OK, I should have said that I always get a code 12 at the beginning of the sequence, even though I hadn't disconnected the battery.
And I have read on someone's site that this is sometimes the case.. But for the life of me, I can't find that site now.
My 97 has shown a 12 and 55 since the day I got it. Using the key cycling method or using a snap on scanner. I consider it to be the "beginning" and "end", but never bothered to check any farther.xjohnnyc said:OK, I should have said that I always get a code 12 at the beginning of the sequence, even though I hadn't disconnected the battery.
And I have read on someone's site that this is sometimes the case.. But for the life of me, I can't find that site now.
JohnX said:My 97 has shown a 12 and 55 since the day I got it. Using the key cycling method or using a snap on scanner. I consider it to be the "beginning" and "end", but never bothered to check any farther.
JohnX said:My 97 has shown a 12 and 55 since the day I got it. Using the key cycling method or using a snap on scanner. I consider it to be the "beginning" and "end", but never bothered to check any farther.