Keyless entry and TPMS down on '15 sierra

snowman03782 · April 30, 2018

Hey all,

I have been searching the forums trying to find anyone else who has had keyless entry & tpms issues pop up at the same time. My tpms acted up the other day, one side showed blanks for pressure while the other side had indication. Shortly after, all was blank and the keyless is unresponsive. I have checked all bcm fuses on both sides of the dash. All was fine. I then unhooked the battery for an hour. To my surprise and delight, all started working again. An hour later, same issues were back. I have found if I unhook the battery for a few seconds and hook it back up, the keyless starts working. However, if I start the truck and shut it back off, keyless returns to inop.

I understand the "RCDLR" can be the issue? I pulled up my floormat and found the driver side soaking wet... maybe I do have the sharkfin leak and was unaware. I am a month out of warranty on this 2015 Denali ? If anyone has any input or knowledge on the issue, I would appreciate it. What would this fix typically cost? Thanks in advance.

snowman03782 · April 30, 2018

Sorry for the double post.

ChristopherDB · May 1, 2018

Are you on the original battery? If so, maybe that could be the problem? My old vehicle had an issue with the fob and I did a battery diagnoses and it needed replacement. I didn't replace it immediately and it got worse to a point that the fob wouldn't start the car and I had to hold it up to the steering column (it was a push start) Once I replaced it, the fob started working as normal.

snowman03782 · May 1, 2018

I am.. but both fobs don't work when this happens and disconnecting/reconnecting battery fixes it briefly. It was working for about an hour yesterday. Also, one fob has hardly been used...