Speedometer Not Working and/or Code P0722 Stored in PCM on Chevrolet Aveo

Problem Description and Possible Solution

The speedometer may stop functioning with code P0722 stored in the powertrain control module (PCM). This may be caused by a worn speedometer gear due to coolant contamination of the transmission fluid. If contamination is found the radiator is most likely at fault. The transmission should also be thoroughly inspected and repaired or replaced as required.

Problem Data
RepairPal Verified
Average mileage: 86,381 (28,000–260,000)
Drive Trains affected: Automatic Transmission, Manual Transmission
8 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010, 2011
46 people reported this problem
Viewing 1 - 20 of 20 comments
we have a problem with our aveo in our dealership the speedo donot work can anyone help urgent
Car bogged down like it mas similar to a misfiring, then I noticed the speedometer was at 0. After downshifting at a coming stopsign, it bogged again & the speedometer picked up again, only to fizzle out again as I accelerated.
having the mechanic repair the speedometer as we speak... mechanic is concerned there's more to it...
Speedometer stopped working and check engine light came on. Repair shop said the gear that runs the speed sensor is broken due to contamination. Have to replace the transmission and radiator. Said it would cost $2500.
When driving the highway my speedometer went out and my digital odometer was still visible but it was no longer changing. The check engine light had also come out so we went to auto zone to get a general diagnosis. We were told it was the outshaft speed sensor so we bught the part and had it installed however that did not fix the problem. We took it for further inspection and were told that some coolant may have leaked into the transmission, damaging it. So at least we know whats wrong with it however it will be costly repair.
First speedometer stopped working next odometer stopped , check tire light came on then check engine light came on. Felt like transmission was not shifting properly from 3rd gear.
Took into shop . About 3,000 dollars to fix. I called GM ,no recall. Might give some help if I decide to repair. I traded the 2009 Aveo . It had only 60,000 miles on it.
Speedometer quit, won't go into overdrive, cross contamination between antifreeze and transmission fluid
Odometer failed had checked out referred to chevy dealership was told that radiator basics puked into the transmission repairs will cost $2500.00 for a car valued at $3800.00 having $1500.00 repair done to it to get it home and trade it off was stupid enough to bought a Sonic last year for myself
odometer wont pass inspection because it sometimes is not readable. it costs $280.00 to replace; and $65.00 to program. dumb for md inspection !!!!!
Speedometer quit worker and transmition stays in drive and don't shift through the gears.
Code 722 . If thisbis a big problem why cant chevy live up to it .I will not buy a chevy again back to ford for me
I am not sure if this is the cause of the problem, but the cluster was replaced along with the transmission speed sensor and the problem was not resolved.
I had trans fluid leaking into my radiator, which in turn contaminated my radiator and all hoses, got them all replaced out of pocket only having the power train warranty, haven't even had the car 3 years.
After getting the radiator and lines replaced, then had to replace thermostat.
One week later my speedometer stops working, gear is morphed and not sending correct signal to output speed sensor.
Dealer claims problem was caused by radiator leaking coolant into transmission fluid.
None of which is covered by warranty.
This car sucks.
I have an automatic, but yes, radiator went bad, and I have to replace my transmission due to coolant mixing with the trans fluid. good thing I bought the top of the line warranty, or it would have been all my expense.