Wouldn't waste money on a cap. Disconnect the amps and see if the tpms light comes on. If not, run a second battery. Iv'e found the these new dodge's are finiky with the new powernet system. I'm running an Alpine MRP-1000 and MRX-V70 and have no problems with 4ga power wire. Not to be a smart ass but is one of the tires low? Could just be a bad sensor as well. Just my thoughts. Good luck
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