TPMS Problems

[latvius]

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.

 

[OR VietVet]

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.

 

[TJ Baker]

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

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.

 

[TJ Baker]

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.

 

[latvius]

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.

 

[TJ Baker]

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

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

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

 

[TJ Baker]

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.

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.

 

[latvius]

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.

I changed my aftermarket stereo a while back but back to why would it only affect 2 sensors and not all.

 

[TJ Baker]

I changed my aftermarket stereo a while back but back to why would it only affect 2 sensors and not all.

Seems unlikely that a radio would do it,,, at least I haven't heard of such a thing.

 

[latvius]

I ordered a pretty nice scan tool with a modern interface, I figured I own two of these GMT800s so it'll pay for itself eventually.

 

[latvius]

Got this Topdon phoenix lite today

https://www.amazon.com/dp/B0B1MB6YG8?ref=ppx_yo2ov_dt_b_fed_asin_title

I verified the sensor id's are different. When the truck sits everything is fine, I was idling for about 30 min the other day and no problems

 

[latvius]

My mechanic is stumped as well as google is.

I have an idea though, I have a 2005 Denali that I have 4 brand new acdelco gold sensors ready to get installed. Once that is done and they are verified working. I am going to do some tire swapping and relearning (tires same size) and see if the problem follows the tires or stays with the truck.