# Saturn Ion Shutting off **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ion, saturn\ **Created:** [July 21, 2013, 3:23am UTC](https://community.cartalk.com/t/saturn-ion-shutting-off/80449 "2013-07-21T03:23:54Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![utchwilly](https://avatars.discourse-cdn.com/v4/letter/u/90ced4/32.png) [@utchwilly](https://community.cartalk.com/u/utchwilly)\ **Post date:** [July 21, 2013, 3:23am UTC](https://community.cartalk.com/t/saturn-ion-shutting-off/80449/1 "2013-07-21T03:23:54Z")
2006 Saturn Ion2, 2.2L, The car seems to run fine with no a/c, strong acceleration, 900RPM idle. When the a/c is turned on at idle, the revs drop to 400RPM and the engine shudders. At speed with the a/c on, the car shuts itself off and throws code U0100(lost communication with engine control module), emissions light, and flashes “PWR STR” and “COOLANT” on the dash. My theory is: the a/c over stresses the motor, dropping the engine revs, causing the voltage to drop below 10v. The ECU then panics and shuts off the motor. Is this possible? I would like some reassurance before I start swapping out parts in the driveway. ---
**Author:** ![utchwilly](https://avatars.discourse-cdn.com/v4/letter/u/90ced4/32.png) [@utchwilly](https://community.cartalk.com/u/utchwilly)\ **Post date:** [July 21, 2013, 3:47am UTC](https://community.cartalk.com/t/saturn-ion-shutting-off/80449/2 "2013-07-21T03:47:30Z")
I forgot to mention that when I removed the oil cap while the engine was warm, smoke was coming out. Not a lot of smoke, but it was noticeable.