Integrated Trailer Brake Controller (is there 1 or 2?)

[Colorado_Ry]

2015 Silverado.  I'm getting the same Trailer Brake Service message everyone's been getting for years.  It comes on intermittently (sometimes worse than others) when I'm not towing. 

 

I have a progression I want to go through before going to the dealer (bought used/extended warranty).  But, I do have a question about the Integrated Trailer Brake Controller underneath the spare tire.  (The part on Amazon: https://www.amazon.com/dp/B07J5LNPWT/?coliid=IL3DWP1YVFWXN&colid=11KU4XGPMZLVK&psc=0) 

 

I went under there over the weekend to remove and clean the controller.  I followed a decent video.  Didn't solve the problem.  But, the video pointed out that there are two identical controllers, one underneath the first.  I got the first one out, but I couldn't pop the clip on the second as it was turned up and away.  So, I just want to check.  Are there in fact two of these Integrated Trailer Brake Controllers under there, or is that second one actually something different.  

 

My planned progression:

1) Clean (again)/brush/grease trailer socket but this time expand the prongs a bit to make sure one isn't too close.  

2) Find and clean ground (anyone know where this should be?)

3) Top off brake fluid to max line- I saw this somewhere.  Sounds weird to me, but it's an easy step without buying parts. 

4) Remove trailer socket.  Inspect/clean backside.  

5) Replace either the controller above the spare (is it just one?) or the dash switch.  I'm 50-50 on which I'd do first.  

 

Thanks!

 

- Ryan 

 

[btj_z71]

MHTook mine to the dealer last week, there was an update for the chassis control module so they did that and seemed to solve the problem, cost me $172. 

 

Well I am going back today because the same service message popped up again several times this week.  Will find out what they have to say this time around.

[silveradosid]

friends 2014 denali does this, all he does is work the slide control back and forth a few times and the message goes away for a few months and then comes back he just does the slide thing again