# Check engine light- code P0128

**URL:** <https://community.cartalk.com/t/check-engine-light-code-p0128/185870>\
**Category:** Maintenance/Repairs\
**Tags:** pontiac, grandprix, grand-prix\
**Created:** [August 17, 2022, 6:14pm UTC](https://community.cartalk.com/t/check-engine-light-code-p0128/185870 "2022-08-17T18:14:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Angelv3059\_180292](https://avatars.discourse-cdn.com/v4/letter/a/e9bcb4/32.png) [@Angelv3059\_180292](https://community.cartalk.com/u/Angelv3059_180292)\
**Post date:** [August 17, 2022, 6:14pm UTC](https://community.cartalk.com/t/check-engine-light-code-p0128/185870/1 "2022-08-17T18:14:21Z")

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07 Pontiac Grand Prix base model 3.8L. Replaced engine and thermostat in April. Check engine light comes on and I went to get it read and it is saying thermostat or gasket. I was not experiencing any issues overheating, etc. a few days later the light comes off, do I still go get this looked at or leave it for now? I do have a warranty on the part still.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [August 17, 2022, 6:22pm UTC](https://community.cartalk.com/t/check-engine-light-code-p0128/185870/2 "2022-08-17T18:22:33Z")

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That code usually means the thermostat is stuck open.

Tester