Why does the power steering go out and reset when engine is turned off on a 2006 Cobalt?

On a 2006 Chevrolet Cobalt, the power steering is electrically assisted (EPAS), not hydraulic. This means it doesn't have a traditional power steering pump and fluid. The power steering system relies on the engine's electrical system to function. When you turn the engine off, the power is cut, and therefore, the power steering temporarily goes out. There's no "reset" involved; it's simply a designed characteristic of the EPAS system. The power steering comes back on automatically when you start the engine again.

If you're experiencing a problem where the power steering is behaving erratically *even when the engine is running*, that's a different issue entirely. This could point to problems such as:

* Faulty EPAS motor: The motor itself might be failing, causing intermittent power assistance.

* Electrical problems: Issues with the wiring harness, fuses, or the EPAS control module can disrupt power to the motor.

* Low battery voltage: A weak battery might not provide sufficient power to the EPAS motor, leading to erratic operation or complete failure.

* Steering angle sensor issue: A malfunctioning sensor that tells the system the steering wheel position might be causing problems.

If your power steering is acting up *while* the engine is running, you should have a qualified mechanic diagnose the problem. It's not normal behavior and could be a safety concern.