Four problems related to alternator/generator/regulator have been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
Almost dusk, high beams were on. Thought I saw a flicker. Got behind another car and saw that it was my lights. Looked to my panel and my voltage was swinging between 9 volts up to 18-19 volts. Turned all power draw off except my low beams. Needle kept swinging and lights kept flashing. Was 6 miles from home. I made it. There was a discharge to my system instead of continueing to charge. Took to dealer. Nothing found. 11-6-2012 it happened again. Has happened inbetween also. Very intermittant. Had batttery & alternator checked at least 3 times. Always good. After incidents, works fine until next time. Never happened in summer. Always when cooler weather. Now that it is December, afraid to drive after dark. There must a bullentin or recall??? too many complaints on this problem. Don't want to get rid of my car. Engine is good. Only 69,000 miles. Is dealer just acting dumb?.
I have had my 05 GMC Envoy for several months now and have taken it to be repaired at least once a month! my issue is with the electrical system and the headlights and console "flashing" at night. I have taken it to the dealership twice and the first time they checked the battery, some cables and gave it back to me saying they could not find anything. The second time I took it back about a month later because the light were still flashing. The dealership had it for 2 days and told me it was my alternator. I did not believe them and did not get my alternator changed ($675. 00) and my car has been starting and running fine. My headlights still flicker, but there is nothing I can do about it. I have read several other complaints about this and most of them go through a new battery and alternator and it still does not fix the problem. This is something GMC needs to look into and fix because it is a huge safety hazard.
2005 GMC Envoy - since purchase, the headlights will dim when driving at night; seems to happen after first starting the vehicle. The battery gauge will drop down to under 11 volts when this occurs. The dealer has tightened the ground connections and replaced the alternator twice; after returning the vehicle to the dealer a third time, I was told that this is "normal". The vehicle is now out of warranty with 50k miles and the problem still exists.
(2005 Envoy) about 1 month ago I noticed that my headlights were dimming while driving at night . This happened sporadically. When the lights dim, the heat slows down as well. The interior lights occasionally dim when this happens, too. My husband and I thought it might be the battery and started to look at the battery gage, while one of us kept an eye on the lights. This problem has happened about 7 times over the last month. Last week it happened about every 2 minutes while driving down the road. Very scary, as I thought the truck was just going to shut down. I took the truck to my gm dealer and the mechanic said that there is nothing wrong with the truck. The battery, alternator and wires were fine. He stated that with new vehicles and everything that is run in them this is normal. Although he also stated that he has never seen this problem before. Their computer told them that nothing needed to be fixed. We have no aftermarket products in the vehicle and the only things running were the heat and radio.