# 03 Cadillac CTS Stalling

**URL:** <https://community.cartalk.com/t/03-cadillac-cts-stalling/70559>\
**Category:** Maintenance/Repairs\
**Tags:** cts, cadillac\
**Created:** [January 21, 2012, 8:11am UTC](https://community.cartalk.com/t/03-cadillac-cts-stalling/70559 "2012-01-21T08:11:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mashbmash](https://avatars.discourse-cdn.com/v4/letter/m/977dab/32.png) [@mashbmash](https://community.cartalk.com/u/mashbmash)\
**Post date:** [January 21, 2012, 8:11am UTC](https://community.cartalk.com/t/03-cadillac-cts-stalling/70559/1 "2012-01-21T08:11:13Z")

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I have had my 2003 Cadillac CTS for just over a year, and I’m at around 115k miles. Suddenly the check engine light came on & it began stalling randomly a few days ago. One thing of note: last time it stalled on me, right before it stalled, I had been doing a steady 35mph and suddenly felt a hard downshift (it’s an automatic), then lost all power to the accelerator for a few seconds.

Today I had the crankshaft position sensor replaced, which according to my research (aka Googling) is a common problem. That didn’t cure the stalling issue, and the check engine light is still on.

A local mechanic tells me there is an O2 sensor shorted out, and shift solenoid C is stuck. Friends tell me to have the fuel system checked out.

Ideas before I spend a wad of hard-earned cash on nothing? Thank you!