Service TPMS message on -2009 Pontiac G5,tire indicator light on, but sensors ok

What is your question?

All 4 sensors tested ok (i brought car to a tire shop for testing after the following problem occurred) but get no psi reading on info screen for any tire. This is how it started: I sent my son to have his oil changed,they added air to tires that lead to tire light coming on & not able to get reading on rr tire pressure. Brought back to service center where they tried to reset tpms, then got reading for rr tire but lost it for lr tire. Drove off & lost readings for all 4 tires, service tpms light on as well as tire indicator lamp.But they say its nothing that they did & dont know how to fix. Any ideas as to what i can do from hear?

What makes this problem better or worse?

Eager Beaver Oil change shop -went from bad to worse

How long has your 2009 Pontiac G5 had this problem?

1 1/2 weeks