My door ajar alarm just started coming on continually when excellerating beyond 15 to 20 miles an hour. All doors are in fact latched. I sprayed WD40 on all 4 Quad cab door latche's, but with no resolve.
What is the proper step to take to correct? 75% of the time its strictly drivers door that gets the use, so I would think this is suspect. The rear left passenger electrical lock hasn't responded in approx. 1 year.

Thanks

 

Check the wires that run in to the doors very common problem for them to break

 

there is also a door close sensor somewhere that may have failed... I had this happen on an SRT-4 I was putting a remote start in and it drove me nuts....

 

Will do. Yesterday I determined the door causing is the left rear passanger, so I'll check its wiring.
Thanks!

 

As said, if it's not in the wiring the the door latch assembly has failed. It is replaced as a unit. I think we have a How To in that section. It's simple to replace though