# 2013 Cadillac Escalade P3400

**URL:** <https://community.cartalk.com/t/2013-cadillac-escalade-p3400/126104>\
**Category:** Maintenance/Repairs\
**Tags:** escalade, cadillac\
**Created:** [October 2, 2018, 10:54pm UTC](https://community.cartalk.com/t/2013-cadillac-escalade-p3400/126104 "2018-10-02T22:54:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Randy33](https://avatars.discourse-cdn.com/v4/letter/r/74df32/32.png) [@Randy33](https://community.cartalk.com/u/Randy33)\
**Post date:** [October 2, 2018, 10:54pm UTC](https://community.cartalk.com/t/2013-cadillac-escalade-p3400/126104/1 "2018-10-02T22:54:35Z")

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My check engine light comes on when I fill up my tank with gas. It goes off when I get below half a tank of gas. I took it to an auto parts store and they checked the code which comes back with a P3400 Cylinder deactivation system bank 1 code. Any Ideas what could be the problem(s)

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**Author:** ![common-sense-answer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/common-sense-answer/32/716_2.png) [@common-sense-answer](https://community.cartalk.com/u/common-sense-answer)\
**Post date:** [October 3, 2018, 7:28pm UTC](https://community.cartalk.com/t/2013-cadillac-escalade-p3400/126104/2 "2018-10-03T19:28:13Z")

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Strange… fuel level tied into cylinder deactivation circuit somehow… 🤔??

Silly question (you have the wherewithal to get codes read), but I have to ask, sorry…  
(and we need to get this discussion going)

…You have the specified engine oil AND you have checked/rechecked the oil level for proper fill?  
🌲🙂🌲  
_ **CSA** _