2005 GMC Envoy Problem

[quote:bc2080fe22="gmb1962"]Computer problem
2005 GMC Envoy V8 Two Wheel Drive Automatic 62,000 miles

The Battery went dead in my envoy. I was able to get it cranked and took to local store where they determined that the battery needed replacing. I noticed on the way to store that the fuel guage, power windows, power seats, dorr locks and several things like that were not working. After having the battery replaced, the fuel guage began working normally but many things do not such as PW, PL, PSeat, etc.

The battery was totally dead when the problem began as it would not try to turn over at all.

Is there some reset that has to be performed after total battery loss?

P.S. The people who changed battery say they put a power saver on it before disconnecting battery to make sure memory was not lost but I think it was too late as battery was already way dead.

I would appreciate any advice.

Rick[/quote:bc2080fe22]

Disconnect the battery cable, wait 5 min. then replace battery cable = Computer reset. Keep in mind the engine management system's PCM will lose the information stored in its memory when the batteries are disconnected. This includes idling, operating valves and any fault codes detected. This will have to be re-programmed into the units memory. You will experiance surging ,hesitation ,erratic idle and a general inferior level of performance. The PCM will learn on its own if you do nothing. This takes about 2 or 3 days. Quick fix is start engine let idle until normal operating temperature is reached, then run RPM's to 1200 for 2 minutes, then drive vehicle for a minimum of 5 miles at varied driving conditions. This will complete the relearnig process for the PCM. PCM=Powertrain Control Module.