Yes, some do.
No, some are blank and need programmed by the dealer.
Any programming that would need done requires a scan tool.
It is part of the PCM programming.
In some cases the new PCM has to be "flashed" or reprogrammed to match the vehicle's needs.
Has to be reprogrammed at a dealer.
Take it to a dealer! It is the only way I have found!
find a parts house or dealer that can flash the new PCM, you will need the Vin.# year make and modle.
there are several governers/limiter programming into the pcm and are easily adjusted
It is in the air intake box at the front of the car.....one of the easiest PCM's to get to, but no GM dealer seems to want to tell you that.
there are a couple of reasons it could be, it is possible that the sending unit is bad. It could also be the instrument panel cluster or the PCM, there are some reflashes for the pcm for this issue but you would have to find a dealer or an independent repair shop that has the snap on online programming set up. most of the sending units go bad in these and if it is this there is a newer design from GM for some models
VATS can only be disabled by having the vehicle's pcm/ecm reflashed at a dealer
The PCM is bolted to the firewall, under the hood on the passenger side. You unplug, unbolt, and reverse to install. Depending on where the replacement came from it may need programmed.