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TPMS & Radio gremlins

1491 Views 9 Replies 5 Participants Last post by  tomallen
My 2013 F350 CC Lariat with 16,500 miles has developed a TPMS problem. Tire pressures are at factory specs, checked regularly and rotated at 5000 miles. I have not had any issues until now. The alarm went off a few weeks back as I was driving. I checked the TPs and they were good. The truck sat over night and in the morning I went to work no TPMS alarm. Went like that for a few days then an alarm. TPs still good. It has been going off intermittently now and it seems like when it is cool it won't go off. I tried the learning procedure by the owners manual and I can't get past the first tire. I bought a Ford TPMS training device and that won't work either. I went to work Yesterday morning no alarm I was driving along and turned on my radio and the horn beeped and a message came up LEARNING PROCEDURE FAILED TRY AGAIN, now my radio won't work. GPS, Climate, and Phone all work on the touch screen, no radio. Anybody have this happen?
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Only occasional 12-volt chargers cause a problem. Scosche ones seem particularly bad; Ankers so far haven't shown any problems. In addition, if you have added any kind of power supply for extra lighting, for engine management, etc., they can cause the same problems. I was responsible for at least one old thread on this subject. Nothing fixes it if you have the problem. If you get a new charger, it virtually always will solve the problem (and if it doesn't, just go find another charger until the problem goes away).

The problem also comes up occasionally with relays. I ran into it in two trucks where the relay actuating the windshield wipers would throw a TPMS Fault code every time the wipers were turned on. Replaced the relay and the problem went away. The TPMS have standardized wavelengths, code protocols, and so on, so they work with most vehicles. You can't make a change at the TPMS that will do anything.
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