i have a 06 pacifica fwd and the speedometer is reading 90mph when im actually going 60mph.Checked the trans to see if any wiring was lose but no luck everything looked good. Car has stock tire size and trans has not been touch. No check engine light or anything. Any ideas what could be wrong???? Thanks

 

used car new to u?

 

i have had this car since new just recently came up with this problem. Just cant think of anything that could cause that. i know different size tires, gears, or tranny speedometer gear could cause that. Could it be something with the computer?

 

not likely what happened all up to when u noticed this issue?

 

Did you check and see if anyone changed the readout to km/hr from mph?

 

I'm having the same problem as dude09. my check engine light was on briefly then when I looked down, the light was off and it said I was going 100 when I was going the speed of traffice ~ 60mph.

 

what are the codes in the computer?

 

redhill how do you change that from km/h to mph on a 2006 chrysler pacifica touring with 3.5 motor and trans is 41TE-AE ? it ireading 55 to go 35 . changed the input and output sensors and still no change .

 

I know this may sound "disconnected" but this same issue occurred with my 2008 PAC. The cause (for me) was due to my alternator failing. When the alternator is failing, the electronic sensors begin to go haywire because of "voltage cycling" across the PCM board. It starts with the funky speedometer reading. Have your alternator checked. Once I replaced mine all my electronic gremlins went away. BTW I replaced my alternator (and battery) with a more heavy-duty model. Its been 3 years and no electronic gremlins. Just my 2 cents