A message just appeared that said service all wheel drive...

Thanks for using JustAnswer.com! My name is \*\*\*\*\* \*\*\*\*\* I'll try to answer your car questions. I'll start off with some basic checks to do, then we can get into more advanced diagnostics if needed. Let me know if any questions come up, or if there is anything I can do to help! You can update this message at anytime. - I'm sorry to hear about any troubles with the vehicle, but would be glad to try and help! - That message will come on as a warning that there is an issue with the all wheel drive system. It could be caused by a faulty wheel speed sensor, or a driveline component, like the transfer case. - Recommend having it scanned for trouble codes and inspect the operation of the driveline components. List any codes youre seeing to the message and I'll look up diag/repair procedures and post them to the message. - Lemme know if any questions come up while checking things out!

Hello Marc! Let me go check to see if any codes were given. So far all I saw was this message....

Customer attachment 2/12/2021 2:24:19 AM

Ok sounds good, recommend snap on or mac tools type scanner to be able to communicate with and pull codes from all of the modules on the vehicle. Code readers generally will only pull codes from [engine](/topics-engine-chevy/) computer. Lemme know what I can do to help

I went to turn the car on again. I did that two times. The message did not come back.Thanks for explaining why this message might appear. So it usually isn't a major issue, right?is it an expensive repair?Should I take it for a little drive to see if the message comes back? Would that help?

Roger that. May have been a false alarm, but would have it scanned to see what codes were setting. There should be "memory" codes in the engine, transmission, or abs modules that will show what was causing warning message to come on. Would continue to monitor it otherwise and see if anything out of the ordinary. Tough to tell what was going on without the codes. Hoping nothing major. Lemme know what youre seeing!

Ok. So I should go see if I can find the memory codes?Maybe that's something that a scanner would only be able to check.

Right, you'll need professional level scan tool to pull those codes from the other modules, regular code readers like at auto parts stores will only communicate with engine computer. Would take it out for quick drive and see if warning comes back on, then consult with repair shop to have the codes pulled and we can see what's going on. Lemme know what I can do to help!

I'll go test drive it now since I was about to go on an errand when it happened. So for a professional scanner, does that involve going to a dealership that works a lot with my type of vehicle and knows more about it, like a Chevy dealership? Or is it OK to take it to the repair shop that I usually go to for oil changes?

Ok sounds good, hoping it doesn't come back on. The dealer will have a gmc specific/factory scanner that they'll use to diagnose issues, but a general repair shop or mobile mechanic service will have scanners that can pull the codes. Usually oil change places/tire shops wont always have snap on/mac tools scanners, but would definitely ask around. Lemme know how it goes!

Thanks! I just thought of some other questions. I hope you don't mind.... 2)Can really cold temperatures cause false alarms? I keep my vehicle in my garage. It's not heated or insulated though. Lately we've had below zero Fahrenheit temps, like -15 to -25 degrees Fahrenheit. 2) What happens to your vehicle if you don't make sure you have at least half of a tank of gas in the wintertime? I think I heard something about water being able to build up in the gas tank. I'm assuming the gas tank thing doesn't have anything to do with the message that appeared on my dashboard.

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Sure thing! Thanks!

You bet, thanks again for using JustAnswer.com!

You're very welcome!