2005 cobalt stalling out

Not a catalytic converter problem ! All the light's being on is a warning to the driver to take their vehicle to the dealer , not to be inquisitive an try to fix on their own . Complex electronic's , computer , software etc....
ENGINE POWER REDUCED has to do with electronically controlled throttle . Your best bet ,take your vehicle to a qualified repair shop an have diagnostic's run . DTC'S - diagnostic trouble codes stored .
Electronic Throttle Control System Diagnosis Diagnostic Quick Tips Snap on...
Drive by Wire Function and Diagnostics by Wells

first check the throttle plate for carbon build up the look for the knock sensor harness rubbing onto the fan shroud

sounds like same problem as before

the lock is anti theft, This sounds like an electrical mess, Possibly poor connection at a wire harness

the steering motor is located on the colum under the dash,poor design.I bought one at a salvage yard for 150 bucks.took about 2 hours to replace it.you cant just replace the motor,it all comes together

I fully agree.

Yes your absolutly right.
I have a 2006 Cobalt and my power steering completly failed. And this isn't a cheap fix. A quote of over $700 for a steering column replacement because these cars run electronic steering. Unless your under warrenty start searching salvage yards for working steering columns.

Not familiar with a "power steering" warning.

I think this is similar to a oil pressure light coming on. What you are seeing is that the car is trying to stall, so the loss of power causes the power steering pump pressure to drop, and thus the warning.

Need to understand the underlying issues:

(1) Since you start with a power steering warning, must ask, are you making a short turn when this occurs?
(2) If not turning, then need to understand what you are doing when car tries to stall: Driving at highway speeds, idle, car hot/cold?

Could be a CPU problem, less likely a transmission problem, but on a 2005, should be getting a check engine light.

I too had this problem, and it was finally resolved after tracing the wires from the BCM to the steering column. A few of the wires needed to be repaired and repositioned.

YOU HAVE AN ELECTRIC POWER STEERING SYSTEM. YOUR POWER STEERING CONTROL MODULE IS THE MOST LIKELY CAUSE. SCAN THE SYSTEM FOR CODES AND GO FROM THERE.