My aveo speedometer and RPM was stop working today ??

If your speedometer stopped working and stays at 0 MPH, you should have your car checked ASAP. The most common causes of a speedometer that stopped working include are a faulty speed sensor, a broken gear on the speedometer, damaged wiring, or a faulty engine control unit.

Sound like a vehicle speed sensor go to bad. If this is right, the RMP dont showing details.

Not real sure but I found a link which may help
http://thechronicleherald.ca/wheelsnews/94544-qa-problem-with-throttle-positioning-sensor-how-well-do-today-s-fuels-work-in-60-s-

https://community.cartalk.com/t/chevy-aveo-revs-too-high-at-start-and-idle/56627

my 2009 aveo hold light and rpm gauge stop working at the same time,what we did was change the coolent sencer. that worked

I suspect that your sender is malfunctioning. Todays speedometers and RPM is sent from a sensor/sender near the drive shaft. A magnet on the drive shaft is sensed and the revolutions are converted to RPM and speed.

For information see:

http://wiki.answers.com/Q/Speedometer_on_2003_Yukon_XL_doesn%27t_work_most_of_the_time_is_this_a_common_problem_how_much_to_fix_it

Check the fuse for those items that don't work.

Go to the fuse box and change the fuse for "Gauges". I think this might solve the problem.

sounds like a vacuum leak

I bought my 2004 aveo 49 miles. I've had several issues with the car. But recently I been experiencung high idle at start up and clutching. I change IAC. Plugs and wireds. Nothing worked. Today the high idle became constant. It was a metal bubble flex tube near the IAC unit that goes to the exhaust stuff down behind the motor. It apparently was cracked cause today it broke causing the constant high idle sound like a vacumn. We blocked it off with a stick to get the idle back down to 900 rpm instead of 3-4000 rpm took we can get to auto zone for high temp hose per Chevy dealer. I hope this helps someone cause it was fustrating and costly.

the tramission is not shifting its the output sensor on trasm that broken drive slowly the shop gonna pass the scanner on the trasm it should be the input and output sensor not a rebuilt trasm if the shop tell you you need a rebuilt ask for a second opignion hope it help fixya our post thanks pierre