Originally Posted by 4r3s

So this sounds somewhat similar to my situation. Once it gets cold out and my car sits over night outside the next morning when I turn it on the speedometer won't sweep the guage and sits pointing straight down. So if I leave it be it will read inaccurately just like you said. Weird thing is if I notice this before I pull away simply turning the car off and then back on again the speedometer will function normally everytime. The tachometer works just fine for me though. I took the car to the dealer and there were no error codes to read and they couldnt reproduce the symptom. So next time I take it to them theyre going to have to keep it over night when it gets cold enough because that is the only time I've seen this behavior. Didnt see this problem all summer and as soon as it got cold out again it came back...