well time to get my truck inspected and wouldn't you know it the light comes on..have code p0736 and p0037 ....was told to chage filter and fluid and di that and cleared the code drove it and light came right back on..check the code again now it has the p0037 and p0736 which was not there the day before...anyway to fix this myself ..I have about 10 days til my inspection runs out...thanks for all the help in advance..

Which filter did you change and what brand?

The p0037 code is a bank 1 sensor 2 (downstream) o2 heater circuit code. Probably needs an o2.

The P0736 is gear ratio error in reverse I think. This could be caused by a partially clogged filter, the screw on filter in the pan. Use only a Mopar filter as we've had problems with some aftermarket ones.

I changed it using the reg. auto zone stuff...I have changed it before using them with no problems so I guess ill have to do it again with the mopar filters.... used the +4 fluid

on the other code the day I changed the trans fluid it only had the code for the trans the next day after I had the other code...

Also check your shifter adjustment and for loose bushings as not being properly in reverse could set that code too. Also possibly a shift lever position switch (prndl switch? I forget) or wiring.

they had a recall a few years back for that switch.... and I started having problems with the truck then...some time when in rev.. the little circle will not be around the r and it will act like it jumps out of gear but then will go right back.....the dealer installed the switch

Yeah if the PCM is not seeing the switch input that it is in reverse when the manual valve is it will set that code. May just be a bad switch.

anyway to check this??? been looking through the book I got and haven't found anything..is it called shifter switch???? thing is about to drive me crazy..thanks