Four problems related to engine shut off without warning have been reported for the 2006 GMC Envoy. The most recently reported issues are listed below.
My husband and I were traveling when the vehicle shut off with no warning at all and all the dash board lights came on. The vehicle would not restart but would turn. This happened Saturday 9/2/17 on a country highway out in nowhere . We called a tow truck. Thank god for cellphones. On 11/12/2016 hub bearings replaced. 11/15/16 module and connector replaced and fuel level sensors and ring replaced. Three years ago a/c went out. Replaced.
Was driving and my car shut down. Had no control of brakes, steering . Lucky I was going straight . This is the second 3rd time this has happened.
While driving my vehicle without any notice whatsoever it will just shut off right in the middle of traffic. This has happen on several occasions. After a few hours of sitting it will start up immediately. They have not been able to diagnose the problem. We have had the fuel canister, ignition switch and evap sensor all replaced it is doing the same thing. By the way I've had the engine replaced, the transmission replaced the leveling boots replaced and still making payments. There was a recall on the fuel sending unit and they told me because of the mileage they couldn't replace it, but they had evidence at 79000 miles that it was bad because I had it diagnose for that same problem. From the time I purchased this truck it has been nothing more than a nightmare. I pray somebody could get me some assistance on this truck.
I was driving on the freeway at 65-70 mph. The engine lugged a little like it was running out of gas but the tank was half full. The engine resumed running at full speed. A few seconds later the engine shut off. I was able to coast long enough to pull off the freeway. But without power steering and brakes this was not an easy task. Once the car stopped I turned off the ignition and put the car in park. I tried to restart the car but nothing happened. I called a tow truck but the driver could not get the car to shift into neutral in order to put it on the car carrier because the shifter is tied to the electronics. Without power it does not work. He had to call for another tow truck to pull the vehicle in for service. The service technician tested and found low voltage from the ignition switch. He replaced the ignition switch. Diagnostics, part and labor $307. This is a very dangerous problem. If I was not able to move out of traffic I would have been a sitting duck in the middle if the freeway. Since the rest of the electronics are connected to the ignition I had no safety equipment such as air bags. If I would have been in an accident at freeway speeds, it could have been fatal.