2009 Chevy Aveo common issue Code P0722 but no visible fluid contamination?
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My 2009 Chevy Aveo has recently had an issue with code P0722 appearing. The speedometer and odometer both died, and the car is in limp mode - won't shift past 3rd gear. I have read lots about the common issue of contamination of coolant/ATF from a leak in/around the radiator causing degradation of the gear that turns the output speed sensor, however, no evidence of contamination is seen in my ATF or coolant, both look completely normal. I have tried replacing the output speed sensor, and am in the progress of checking the wiring harness and connections as well at the TCM, but I do not want to spend more money on this car if it's possible that this leak/contamination is the issue. Is it at all possible to be dealing with the contamination issue outlined in a technical service bulletin without having any visible contamination of coolant/ATF?
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Hello, it's difficult to say if you have a concern as related to the technical service bulletin or not, but it's definitive that your vehicle has a concern related to the output shaft speed sensor which is affecting shifting past 3rd gear as well as the speedometer issue.
Coolant in the transmission fluid is serious business. If present, it would be rather obvious, and you'd have to replace or overhaul your transmission in the course of repairs of this concern.
If you have zero coolant in your transmission fluid, then continue with normal diagnostic testing related to the OSS code. I don't see the gear being degraded to the point of an inoperative condition if there is no contamination evident.
Auto shop identified the issue as the plastic piece on the differential that communicates with the output speed sensor being worn out. Same piece that many have identified as being damaged due to the coolant contamination issue. Very odd that the exact same issue occurs without any ATF/coolant mixing. To the junkyard this car goes....
Hate to be a conspiracy theorist, but my guess is: the intermix probably did indeed occur, and was "cleaned up" prior to your purchase. It's the only thing that makes sense, and it's unsavory, yet, hard to prove. If you bought it from a dealership, I would reach out for some kind of help out of goodwill if nothing else.
That’s my running theory as well. I purchased the car privately, and have contacted the seller, but he is adamant that for the two years his wife drove the car there were zero issues.
Auto shop identified the issue as the plastic piece on the differential that communicates with the output speed sensor being worn out. Same piece that many have identified as being damaged due to the coolant contamination issue. Very odd that the exact same issue occurs without any ATF/coolant mixing. To the junkyard this car goes....
Shame, that. Did you purchase the vehicle new?
No, I bought it used only a couple of months ago.. barely even got to drive it.
Hate to be a conspiracy theorist, but my guess is: the intermix probably did indeed occur, and was "cleaned up" prior to your purchase. It's the only thing that makes sense, and it's unsavory, yet, hard to prove. If you bought it from a dealership, I would reach out for some kind of help out of goodwill if nothing else.
That’s my running theory as well. I purchased the car privately, and have contacted the seller, but he is adamant that for the two years his wife drove the car there were zero issues.
Sad; doesn't check out. I'm sorry...