It s cobalt 2010. it s writen power steering and when we run with it suddenly it give blow and the speed go down.

This question also edited for clarity and spelling 'Colbalt' to 'Cobalt'.
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It is a well known issue

the infamous power steering message... - Cobalt SS Network

CobaltSS.net https://www.cobaltss.net > forums > infamous-power-s...
Apr 15, 2017 - Problems/Service/Maintenance - the infamous power steering message... - as the title says, i am losing power steering and getting the message on the dash.
Electric Power Steering Problems - Cobalt SS Network
Feb 7, 2008
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May 16, 2013
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Feb 19, 2009
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Power Steering Warning/ Trans. Won't Shift

Chevy Cobalt Forum https://www.yourcobalt.com > threads > power-steerin...
Oct 5, 2015 - My 06 cobalt LS 2.2 has gremlins. A few weeks ago I was driving along everything was fine then out of nowhere power steering warning lit up, ...
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I would start by checking the 2 amp and the 60 amp eps (electronic power steering) fuses in the underhood fuse block i have had alot of problems with the electric power steering on these cars

I would look for a loose wire around the fuel pump, something is shorting it out. Sorry I couldnt do better, but thats a start anyway.Good Luck

No,
Recalls for

1. STEERING:ELECTRIC POWER ASSIST SYSTEM. GENERAL MOTORS IS RECALLING CERTAIN MODEL YEAR 2005-2010 CHEVROLET COBALT AND MODEL YEAR 2007-2010 PONTIAC G5 VEHICLES EQUIPPED WITH ELECTRIC POWER STEERING. THE DRIVER MAY EXPERIENCE A SUDDEN LOSS OF POWER STEERING ASSIST THAT COULD OCCUR AT ANY TIME WHILE DRIVING.
2. POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT. GENERAL MOTORS IS RECALLING 276,729 MY 2009 BUICK ENCLAVE, CHEVROLET COBALT, HHR, MALIBU, TRAVERSE, GMC ACADIA, PONTIAC G5, G6 AND SATURN AURA AND OUTLOOK PASSENGER VEHICLES. THESE VEHICLES FAIL TO COMPLY WITH FEDERAL MOTOR VEHICLES SAFETY STANDARD 102, "TRANSMISSION SHIFT POSITION SEQUENCE, STARTER INTERLOCK, AND TRANSMISSION BRAKING EFFECT", AND FMVSS 114, "THEFT PROTECTION AND ROLLAWAY PREVENTION". ON SOME OF THESE VEHICLES, THE TRANSMISSION SHIFT CABLE ADJUSTMENT CLIP MAY NOT BE FULLY ENGAGED. IF THE CLIP IS NOT FULLY ENGAGED, THE SHIFT LEVER AND THE ACTUAL POSITION OF THE TRANSMISSION GEAR MAY NOT MATCH. WITH THIS CONDITION, THE DRIVE COULD MOVE THE SHIFTER TO "PARK" AND REMOVE THE IGNITION KEY, BUT THE TRANSMISSION GEAR MAY NOT BE IN "PARK".

If you are having a problem with your ignition switch, repost question with full details.
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sounds like same problem as before

im not too sure when the crossover is but the newer cobalts are equipped with electric power steering, and to me it sounds like a short between the powersteering circuit and the vehicle speed circuit.

There are several bulletins GM has put out about the steering on those cars.

General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2005-2010 model year Chevrolet Cobalt vehicles;
2005 model year Pontiac Pursuit; 2005-2006 model year Pontiac G4; 2006 model year Pontiac G5 Pursuit; and 2007-2010 model year Pontiac G5
vehicles equipped with electric power steering. Some of these vehicles have a condition in which a sudden loss of power steering assist could occur at
any time while driving the vehicle. If the power steering assist is lost, a chime will sound and a "Power Steering" message will be displayed in the
Driver Information Center to inform the driver of the condition. Steering control will be maintained, as the vehicle defaults to a manual steering mode.
If power steering assist is lost, it may require greater driver effort at low vehicle speeds, for example, below 15 mph (25 km/h). Unless a driver
compensates for this additional effort, it may increase the risk of a crash.

doubt it's the torque converter. chnces are with the warning light it is either the trans control module. engine speed sensor or it be a gummed up soleniod in the trans. be fore you go to shop try Lucas Oils trans additive it's about 10 bucks and it should take care of the gummed up solenoids. rate this please.