Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
when the check engine light is blinking that means you have a catalyst damaging misfire. if you have changed all the plugs and wires you are getting to much fuel. do you have access to a scanner?
it is a well known problem on a lot of gm v8s. question what kind of air filter do you have?
and as far as the scanner goes i was asking if you have access to one that can read data. not so much the codes. a po300 tells you pretty much nothing.
the most common issue with gm vehicles and the v8's is the mass air flow sensor going bad. a bad mass airflow sensor can cause poor shift quality and misfires. also a lot of people use k and n air filters and the oil in those filters can damage the sensor itself.
i understand a bad mass airflow will cause poor shifting in the transmission. and whenever the tansmission has harsh shifting or an issue the computer sees it will set the stabilitrack light. the 4l60e transmission in those trucks are not as reliable as they should be either. i work in a transmission shop and have literally changed 5 in one week. i would say that is our most commonly replaced transmission. but i would start with the mass airflow and a standard air filter (if you have a K+N)
make sure it is not a duralast brand maf sensor but something such as acdelco or other reputable brands. also no airtex. 99.9% of airtex products are bad.
this is a common issue on these vehicles the only other issue that could be causing this if it is not the MAF is the ignition switch.
sounds like the vehicle was started with the maf sensor unplugged with that many codes. also have you reset the keep alive memory with the scan tool after connecting the new maf sensor?
ok do you have the ability to access the underside of the vehicle? to access the transmission plug? it is on the passenger side behind and exhaust shield. the shield is held on with two bolts which have a 10mm head.
Did you perform an idle learn after you replaced the throttle body?
You have a few codes to do with low volts and no comms.
Can you clear them all and we'll start again.
You need a GM scan tool, many scanners don't do the functions necessary.
Idle learn is a GM scan tool function.
It would be wise to take it to the dealer.
The misfire is the root cause, the ESP and traction control warning lights are disabled and light up as a result. Not the other way as some might think.
I hope this helps you.
Wishing you well, and hope the dealer will sort it for you.