TPMS Problems

When I bought new tires 1 year ago I bought all new tpms sensors (off brand) then a month or so ago one went dead, no communication. So I bought 4 new AC delcos and had them installed.
The LR started to disconnect and reconnect every so often. So I bought another new AC delco and took it to the tire shop. They said all it needed was a relearn and didn't swap the sensor.
Drove it about 10 miles down the road and same thing happens no TP LR, so I take it back and ask them to you know do what I asked them to do in the first place LOL. So they swapped it out.
I verified the LR tire had been dismounted and got the old AC delco sensor out so I could return it.

It started doing it again and sometimes the RF goes out, neither at the same time.

So it doesn't appear to me to be the sensors and the tpms module is part of the BCM (from what I read) so I am at a loss on how to fix it.

Since it is intermittent and you have used TWO AC Delco sensors, I would go right to the BCM and check where it lives for any problems, remove it and inspect the wiring to it, unplug it and inspect EVERY male/female connection and even use some electric cleaner spray and then reconnect and reinstall and see what happens. If that does not fix anything or produce better results, either tape over the light or run it off a cliff.

Sorry, I have a short fuse today.

latvius said:

tpms module is part of the BCM (from what I read)

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at least for my own 2005 Yukon the TPMS system is in the PDM (passenger door module). That's also the module that receives the radio frequency signals from the key fobs.

All tire pressures are sent together in a single message from the PDM that the cluster receives. So it is not likely to be something like a wiring issue or all sensors would drop out together. The messages are sent quite frequently as seen here in a screenshot of a search of a logfile I have. Each line is another report of all tire sensors.

Yeah that makes sense, seems like it would be all sensors inop or random ones not the same 2 over and over. It's almost like those 2 sensors have the same id like they are stepping over each other. I say that because I have been in the TP section looking at each TP in the dash and have seen the LF have no reading then acquire one then right after the LR looses it's reading. (Not saying that's possible just saying it seems like it)

My mechanic has a fancy $3K code reader/interface/thingie so I told him I am gonna visit next week and see what he can figure out.
I have a tech 2 but half the time I don't know what it's trying to tell me.

latvius said:

almost like those 2 sensors have the same id like they are stepping over each other.

Click to expand...

latvius said:

My mechanic has a fancy $3K code reader/interface/thingie

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Hell, the sensor ID ##s can be read out (and written in) with a $15 Bluetooth OBD2 adapter!!

latvius said:

Yeah that makes sense, seems like it would be all sensors inop or random ones not the same 2 over and over. It's almost like those 2 sensors have the same id like they are stepping over each other. I say that because I have been in the TP section looking at each TP in the dash and have seen the LF have no reading then acquire one then right after the LR looses it's reading. (Not saying that's possible just saying it seems like it)

My mechanic has a fancy $3K code reader/interface/thingie so I told him I am gonna visit next week and see what he can figure out.
I have a tech 2 but half the time I don't know what it's trying to tell me.

Click to expand...

Can you think of anything that may be causing radio frequency interference? I think I have read that some aftermarket LED lighting might do this... maybe?? I don't know myself.