Our suburban is having some issues. First, it started cranking for a prolonged period. Usually takes two to three tries to get it to start, then it has a mildly rough idle for about 5 seconds. After about five days of that, we we hit the road for about a 500 mile trip. About 15 miles in the Stabilitrak/TC service light came on. Also said systems were off. When that happened I also noticed the truck switched to 4 high. If I manually turned the selector to 2 high it stayed in 2WD. But if I turned it back to auto it would switch to 4 high.
Over the course of the trip the trains would shift hard from 1st to 2nd, but only when the Stabilitrak/TC light was on. It would go off for about 5 min and then come right back on.
The truck has about 111K on it and we've been lucky enough to not have any issues so far. I checked alternator output voltage (14.5v) and cleaned the TB. I've read it could be a BCM, but it seems like this type of problem is common and people have had various fixes.
Any suggestions would be greatly appreciated!
Over the course of the trip the trains would shift hard from 1st to 2nd, but only when the Stabilitrak/TC light was on. It would go off for about 5 min and then come right back on.
The truck has about 111K on it and we've been lucky enough to not have any issues so far. I checked alternator output voltage (14.5v) and cleaned the TB. I've read it could be a BCM, but it seems like this type of problem is common and people have had various fixes.
Any suggestions would be greatly appreciated!
