I'll be driving down the road going from 0 to 45mph and as soon as I stop accelerating the speedometer will drop to 0 and go haywire going back and forth between my speed and 20 and 0 and 33 and so on. As soon as I let off the gas I can feel what seems like a rough downshifting. My car also has some pretty rough shifting. I've replaced the pcm and that did nothing.



The following is a conversation I had with someone on the chat about my replacement pcm that might get yall up to more up to speed on whats going on. The conversation starts at the bottom of the page...

25/10/2012 6:21 PM bbfanatic23 thats what i need to know... but if thats pretty much true then i think i got a bad pcm
25/10/2012 6:20 PM bayus2972 best bet for you is to post this in a thread...let the whole forum gang voice in....most are WAAAY more knowledgeable than I...
25/10/2012 6:20 PM bbfanatic23 so if your wiring harnest gets shorted out wires then its frys the pcm basically everytime?
25/10/2012 6:19 PM bbfanatic23 i gave him my vin
25/10/2012 6:19 PM bbfanatic23 i didnt 'reset' it because i never got that far because it started up right away.
25/10/2012 6:18 PM bayus2972 someone jump in here..aren't PCM's suppose to be VIN programmed?
25/10/2012 6:18 PM bbfanatic23 but...
25/10/2012 6:18 PM bbfanatic23 ya couse i got instructions on reseting it just like the dealer would
25/10/2012 6:17 PM bayus2972 that's when I found the wire rub...took it back and they fixed the wires...but the PCM was fried
25/10/2012 6:17 PM bbfanatic23 maybe i got a bad one...
25/10/2012 6:17 PM bbfanatic23 thats crazy... its got to be my pcm
25/10/2012 6:17 PM bbfanatic23 wow really?
25/10/2012 6:16 PM bbfanatic23 but people are saying that thats a last resort and its prob not the pcm
25/10/2012 6:16 PM bayus2972 yep..as soon as I picked up the car (from a previous shop job) I test drove it and it did the same thing you described....let off the gas, speedomoieter goes haywire and the car jumps down a gear..
25/10/2012 6:16 PM bbfanatic23 Im just confueed because the issues that ive had/ having make it seem like its the pcm..
25/10/2012 6:15 PM bbfanatic23 so what same problems as me were you having?
25/10/2012 6:14 PM bbfanatic23 I see... but you said you were having the same probs as me?