SandyNeck

My 2017 Sierra has this problem, but the dealer refused to apply this fix because they said that the TSB only applies to the 2014 model. Any suggestions?

The dealer told me to take a picture next time it happened to prove that the probem was really occurring. It happened again, but it was at night and the pic didn't come out well in the darkness. FWIW: Since it was nightime, I did notice that the interior lights also failed to turn on when the door was opened. I do believe that this indicts the door-open sensors.

Hi Again Guys, I just got my truck back from the dealer on the second visit for this issue. They told me that they can't replicate it. I am not surprised to hear this, since it happens so intermittently. The problem is now happening more often and on both sides of the truck. They also said that they can take no further action without replication. I asked if they could narrow down the problem to a list of probable causes and begin with the least involved solution (i.e. replacing the "Door Open" sensors) and see if it fixed the issue. They said that GM would not allow them to "just throw parts at a situation" and would not cover replacement of the sensors without replication of the problem. Bottom line: they said that they can take no further action without replication of the problem in their shop. I told them that it is dangerous, in that I sometimes step out of the vehicle expecting the steps to be extended when they are not. I'm very disappointed in their "too bad" response. This is a legitimate problem on a very expensive vehicle which is less than a year old and well within warranty. I wanted to ask those who got this problem repaired by sensor replacement what they had to do to get work done? I also wanted to ask if anyone might offer suggestions as to what I might do to get the dealer to take action? They're essentially telling me that GM policy does not allow for repair of intermittent problems that can not be replicated in-house. I just can't accept that response, as I'm sure that plenty of customers experience problems that are intermittent or difficult to replicate. As always, any advice is much appreciated. P.S. If anyone cares to discuss starters or go off on a Ted Kaczynski anti-technology rant, please do it elsewhere this time. You've already sufficiently polluted this discussion. Thanks.

Thanks Seamus2154 & Sldhead700, An intermittent door sensor would explain it. If that is the culprit, I'd expect other things controlled by it (dome lights, etc.) to be affected as well. I'll pay closer attention to those functions next time it happens and see how they're behaving. Thanks Again. :-)

Thanks for your valuable input, it really helped to solve the problem. I should be all set now.

Hey Guys, I have a 2017 Sierra Denali with the GM power assist steps. For the very most part, they work well and I like them. However, very occasionally (about once a month), I'll open the driver's side door and the step will fail to extend. If I close the door and re-open it, the steps seem to return to normal operation. I'm not actuating the center stack switch prior to this occurring. Sometimes it can be a little dangerous, in that I'll open the door and just assume that the step will be there, but it isn't. I reported this problem to my dealer, but he couldn't find anything wrong. Not surprising, since it's happening so intermittently. Has anyone else experienced this issue? Thanks for any input that can be offered.

I found this posting to be very informative: http://www.silveradosierra.com/how-to-articles/how-to-hook-up-dual-batteries-factory-style-t284010.html It describes OEM style installation and lists parts, tools & sources required to perform it. Highly recomended reading for anyone considering installation of an Auxillary Battery and wanting to keep their truck in factory style. I had the TP2 Auxilliary Battery option on my old Silverado and found it to be very convenient. Sorry to see they don't offer it on current 1500 series, especially since the battery tray is already there.

I came across the following explanation: Changes to the Service Procedure GM Product Engineering has determined that in some instances the manual re-learn procedure can cause the TPM system to pick up stray sensor signals from nearby vehicles which can result in Diagnostic Trouble Codes being stored and parts being unnecessarily replaced. To address this concern GM Product Engineering will be disabling the TPM manual re-learn capability from the vehicle software starting January 2011.