I recently had a check engine light come on. There was no change in performance of the truck. Had no rough shifting, no automatice changing into Drive. Nothing like some of the things I had read that could occur with this error code. I went to the auto parts store and had the code run and it appeared as P0705-Transmission Range Sensor PRNDL Input. At first, I reset the computer on the truck to see maybe if it was an error but after a second start of the truck the error did reappear. I then did the research with the helpful assistence of the parts man at my local NAPA auto parts store and found the correct TR Sensor/NSS. This was replaced. I noticed no change it performnace. Everything was fine before and remained fine after replacing the part.
Again, the light stays off this time until the third start of the truck. Check engine light reappears again.
I have checked and re-checked the fluid level and is perfect. I disconnected the battery last night and then re checked my work, check wiring - all appears ok. I disconnected the harness where it plugs in to the TRS and cleaned more and also blew out with air from compressor. I had re connected the battery again. The light has stayed off but have only ran the truck once since so will wait and see if the light comes on again after work today. I was hoping that it was maybe a fluke and would stay off one of these times. What else could be the problem here?? Keeping in mind that the vehiicle is driving just fine at this point, anyway.
Any help would be greatly appreciated.
Thank you in advance!!!

 

Well, here is the reslut.... they traced the wiring and found an open circuit 1143 and found a "chewed wire) apparently from some type animal.critter. They repaired the wire and Presto!

I drive my truck every day so I am having a hard time thinking that this happened since I have owned the truck- I am thinking the past owner may have had it parked over a period of time and now the wire just finally now gave in. Who knows!!! Anyway, the headache is over. 1.5 hours of labor paid and we are set again.

 

I'm not trying to be insulting but the code did say transmission range selector "switch".
This is not a PCM reset type of fault.
The PCM is set up to go at least 2 drive cycles before the logic decision is made to turn on the CEL lamp or we all would have that lamp on more times than we care to see.
Careful look at the harness could have saved you the cost of the switch and labor to install it..
Bottom line is don't rely on the code to tell you "exactly" what any problem is but only the function involved and it's many parts.

 

You are right but everyone that I aksed about the code told me to change the TRS/NSS. And I aksed alot of people! Anyway, it was a $53 part and I installed in myself so it was not a big deal. As far as looking at the harness, i looked where I could and where I thought I should. They found the problem and fixed it in 90 minutes so that was pretty good. I was satisfied with that.

 

As long as it's fixed all is well. i have seen a few now melt the harness near the EGR. Wiring problems can be a royal PITA. not so much to fix but just to find.
Alan