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I recently had my C6 GS 2013 in the shop at a dealer as a warning light came up to service the TPMS. I took it in, all four were bad, so I had them replaced ($125 a piece, plus P&L)... drove it home and after 20 minutes of driving.... same light came on, so back to the dealer. The tech check the TPMS... all good... except.... he said that the Remote Door Lock Receiver was bad and needed replacing. He said, they don't make the part anymore... and would have to go used.... My question, and this is what I asked him.... what does a remote door lock receiver have to do with the TPMS system that monitor tires.... he said it all feeds in to that part. Is he right? Is there and after market part for this???
The RCDLR is responsible for receiving the signals from the fobs and the TPMS sensors, so he is correct. No aftermarket part that I'm aware of, although it's possible that the RCDLR you have simply has some cold solder joints that could be fairly easily be resoldered. Common enough problem, but since the GM mechanics are essentially just parts replacers, they'd be unlikely to try to actually fix anything.
If you can start the car (RCDLR can pick up the fob via two RCDLR antennas to prove that the fob is in the car), then its not the RCDLR.
So lets make this easy, and give me the number of the back of the fobs (either one, since will tell me if the RCDLR is set to USA, or EXPORT).
There are 4 different TPMS required for the C6, being 2005 to 2009, then 2010 to 2013, with a sub category in each year for "USA" car of 315MHZ, or "EXPORT" car of 433HZ.
If the correct year and frequency TPMS's are installed in the tires, and the RCDLR can not pick up the TPMS, then would suspect after market LED bulbs installed in the car putting out enough RF noise that is blocking the TPMS signals to the RCDLR antennas, if the tech did get the RCDLR into TPMS learn mode correctly, did trigger each of the TPMS in the correct order as well.