Was driving today and it started running extremely rough and engine light started flashing. Got home and went to check codes and no bus popped up. It runs and cranks just runs horrible. Any help would be appreciated
No bus, runs horrible, and can't check codes
- Thread starter 1Blacktj
- Start date
OP
The PCM provides 5V reference voltage for the TPS, CKPS, CMPS, IAC and MAP so it is doubtful the PCM has died yet, but the some of the internal communications of the PCM are affected due to bad circuit board traces and connections.
Contact Mark @Wranglerfix who is the forums resident PCM guru. He should be able to assist you in determining whether the PCM is at fault.
@1Blacktj Please send me an email with your contact information as well as the year Jeep and issues that you’re having and I will get back to you with my thoughts.
Thanks,
Mark
Thanks,
Mark
OP
Sent you a private message with all the info. Couldn't find your email anywhere.
WranglerFix, LLC.
6191 Orange Drive
Suite 6177 – N (2nd Floor)
Davie, FL 33314
Phone: 866-888-7710
https://wranglerfix.com/
OP
Talked to someone and they said it sounded like the PCM was going bad so I am buying a re[placement and hopefully, that will fix my issue.
I had that same problem a couple years back and it turned out to be my spark plugs. But eventually my PCM went bad and Mark from Wrangler Fix hooked me up. Jeep runs like mew now.
OP
So I bought the replacement PCM but will the mileage be correct once I replace it? sorry if its a dumb question I just have no clue.
The mileage will be correct as it is stored in the instrument cluster.
OP
Gotcha. Thank you so much for your help and I will update once I get the new one put in!
Hey Mark, wow so it's really not the PCM sending the mileage of the Jeep to the cluster? ..I didn't really know about this!
Which other secrects do I miss about the pcm?
Good to have you as a reference btw
OP
So I got the new pcm in today and still is running rough and the no bus pops up once I plug the obd2 in and won’t check the codes. No idea where to go from here.
fourpointzero
TJ Addict
Oh man, that sucks. I can relate to that feeling. Hopefully someone will point you in the right direction, apologize it's not me.
The good thing is these Jeeps are always fixable, so you'll eventually be back on the road. Cheers
The good thing is these Jeeps are always fixable, so you'll eventually be back on the road. Cheers
OP
Oh man, that sucks. I can relate to that feeling. Hopefully someone will point you in the right direction, apologize it's not me.
The good thing is these Jeeps are always fixable, so you'll eventually be back on the road. Cheers
I’m just not sure what to try next.
You may want to check-
for a wire getting too hot- I had an injector plug on my manifold making one go crazy
Loose connections under the power distribution box by the battery
A short in the harness- typically around the back of the engine