I recently purchased a set of new tires for my truck and shortly after having them installed I got a TPMS error on the driver side rear tire. When I view my tire pressures on my screen, all the tires show a pressure except the driver side rear which shows "--". I tried training the tires by doing the train procedure utilizing the method of letting air out of the tires and three of the tires would train (horn would honk) but the rear driver side tire would not. In reading the error codes, the only error I get is "B124D" which is a Tire Pressure Sensor General Signal Failure. I bought a new OEM TPMS and had it installed by a local tire shop and the installer told me that the truck would learn the rear two tires (one of which had the new sensor) but would not learn the front two tires and they recommended replacing the TPMS on both front tires. I brought the truck home and ordered a TPMS Reset Sensor Programming Training Tool and tried to get the truck to learn the tires myself and am still having no luck. In doing the learn procedure, I can get both rear tires to respond but not the front tires (same as tire shop). Should I just replace the front TPMS sensors and go from there. Is it possible that it is a bad body control module? I hate TPMS sensors but I hate having the error signal on my dash even more.

 

2016s have auto learn features. You shouldn’t need to initialize them at all. Each corner should pick up its signal if there is a functioning sensor in the wheel. Just drive it.

another option is to turn off the TPMS completely. One number change in forscan and they’re gone. Do it every winter with my winter wheel set that don’t have sensors.

 

After changing out all the TPMS modules and having the truck still not register the modules, I determined the problem. Shortly after I purchased the tires and had them installed, I ordered a Rough Country Speedometer calibrator and calibrated my speedo based on my new 32" tire size vice the stock 31" size. When you do that, you can no longer use any kind of diagnostic tool on the truck via the OBDII port. Apparently, you also can not get the truck to learn new TPMS sensors. I set the truck back to the default settings using the calibrator tool and was able to use the learn mode to get the truck to register all my sensors. Unfortunately, the lesson cost me about 100 bucks between purchasing and then installing new TPMS sensors when I really did not need to.

 

Interesting.

This is a good lesson for when the 'fix' suggestion is to 'return to stock' or 'your alterations may be the problem.
People are quick to say that the work they have done has nothing to do with what they are trying to do.

In this case, why would a speedometer calibration have anything to do with air pressure.

Bottom line, trucks computer system was altered.

Good for you on troubleshooting the problem.
Nice to know it's all resolved. It was pretty odd with your descriptions of why it wasn't actually working.
Imagine taking tires in to a shop and them not able to send you home without a check tire pressure light after you spend $1500 on your favorite new wheels!