Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello and welcome! My name isCustomerand I can assist you with your question. It appears that you have covered everything. The only other thing you can do is either get then PCM reprogrammed/updated to the latest software available or simple replace the PCM itself. Sometimes stats or counties that do emissions offer a TAC (technical assistance center) where you can bring these trouble some vehicle into and they will help get these monitors to run and or simple provide a waiver for the trouble some vehicle. You may want to look into that.