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Well code 700 is a generic code that means there is a problem with the transmission or the control module. Code
736 is an incorrect gear ratio for reverse, code 731 is incorrect
ratio in first gear, and 720 is the code for the speed sensor which
involves the engine computer as well as the speedo. Its possible the speed sensor is causing the other codes. I
would have a shop check the speed sensor circuit, clear the codes, and
see how many come back then proceed with more testing as needed.
p1781 is manufacturer control transmission, p0731 is gear 1 ratio incorrect, p1784 is manufacturer control transmission, p0700 is trans, control system malfunction. all of these codes refer to tranny.This code normally points to a faulty transmission control module, but this is an expensive part and you should have an experienced Dodge technician diagnose the problem first. or a transmission specialist. the other codes are probably associated with the p0700 code. have a good day !
P0731 Gear 1 Incorrect Ratio
P0500 Vehicle Speed Sensor "A" P0501 Vehicle Speed Sensor "A" Range/Performance P0502 Vehicle Speed Sensor "A" Circuit Low Input P0503 Vehicle Speed Sensor "A" Intermittent/Erratic/High
Sounds like maybe the transmission has a problem or the tires are the wrong size.
I'm not sure how much to fix, though.
Depends on the price of tires (4 or 2) and maybe transmission problem needs to be looked at.
speed sensor most likely this transmission runs 2 an input and an output. if your speedometer is fluctuating or not working it would be output problem if not probably an input speed sensor. these sensors can be purchased for around 40$ i believe at your local dodge/chrysler dealer.
replacement is fairly easy. open hood remove air cleaner locate the sensor on the transmission. in put is closet to engine. unplug sensor remove by unscrewing it. reverse for installation. disconnect battery for 2 min to clear codes and road test
A vehicle speed sensor that is starting to fail could cause this, or less than likely bad wiring or connections, or yes, a bad cluster could do this... But how exactly did she notice the speedometer was 10MPH fast?? There are no real accurate speedometers in vehicles (Don't get me wrong they shouldn't be off by 10MPH) but there is a 5 or so percent difference high or low in many vehicles even with stock powertrains. I've plugged in with a diagnostic scanner on many vehicles and the dash speedo shows 60MPH, but the electronic speed readout on the scanner reads as low as 55MPH or as high as 65MPH
You say you changed the cap and rotor so I'm assuming the van has a 3.0L? Possible injector problem on cylinder #5, swap injector with cylinder 1 or 3 and see if miss/dtc moves to that cylinder. You also could have a vaccum leak, although they usually won't come and go. Does the vehicle have a consistent miss or do you just have a check engine light?