Battery problems of the 2005 GMC Sierra

- the contact owns a 2005 GMC Sierra hybrid truck. Two weeks ago while driving at 5 mph the vehicle's steering wheel and the brakes locked. The contact was able to drift to a stop. The vehicle also vibrated, and made a whistling sound. After several attempts the contact was able to restart the vehicle. The vehicle's lost power at red lights; however, it restarted. The dealer stated that they did not have the parts to repair the vehicle, they were also waiting for a technician to diagnose the vehicle. The vehicle has been at the dealere for three weeks. The dealer also stated they didn't know where the parts were coming from, yet they've ordered the parts. The contact was currently renting a vehicle. There were no warning indicator lights present at the time of the incident. Two weeks prior to the failure, the contact's vehicle overheated and the warning indicator light appeared. The dealer replaced the water pump. The contact also spoke to gm and was told they would investigate the dealer. The contact thought there was a failure with the battery, it was defective and serviced under the warranty.

When listening to the radio only in accessory mode for approx. 2-4 hours the battery is drained without warning to the point that the truck will not start, the onstar goes dead -we are unable to summon help if needed, and the radio goes completely dead. We have had the vehicle to the dealership and was given a bulliten from gm (document id# 1689523). General motors customer service is working with us, but the dealership claims that there is no way to fix the problem. The truck has approximately 3600 miles on the odometer, when purchased in June the truck had approximately 590 miles.