How do you reset computer on 2006 pontiac montana van?

To reset the computer on a 2006 Pontiac Montana van, disconnect the negative battery cable and let it sit for about 15 minutes. This allows the system to clear any stored codes and reset the computer. Afterward, reconnect the negative battery cable and start the vehicle, which should reset the computer settings. If necessary, drive the van for a short while to allow the computer to recalibrate.