# 2017 Chrysler Pacifica P0440 Evap System Code, Rough start after sitting a couple of days

**URL:** <https://community.cartalk.com/t/2017-chrysler-pacifica-p0440-evap-system-code-rough-start-after-sitting-a-couple-of-days/163121>\
**Category:** Maintenance/Repairs\
**Tags:** chrysler, pacifica\
**Created:** [April 20, 2020, 4:33pm UTC](https://community.cartalk.com/t/2017-chrysler-pacifica-p0440-evap-system-code-rough-start-after-sitting-a-couple-of-days/163121 "2020-04-20T16:33:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mix2pix\_157323](https://avatars.discourse-cdn.com/v4/letter/m/f14d63/32.png) [@mix2pix\_157323](https://community.cartalk.com/u/mix2pix_157323)\
**Post date:** [April 20, 2020, 4:33pm UTC](https://community.cartalk.com/t/2017-chrysler-pacifica-p0440-evap-system-code-rough-start-after-sitting-a-couple-of-days/163121/1 "2020-04-20T16:33:44Z")

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Back in October of 2019, the check engine light came on and my code reader is showing a P0440 and P0456 Evap System with a “very small leak”. 90k miles. My mechanic did a smoke test but found nothing. We reset the code thinking maybe it was just an error. After a week or two, the check engine light came on again. Same code. I decided to do nothing. Now, April 2020, I have 93k miles and if the van sits in the driveway for a couple of days without being started, it takes longer to start. If it sits for over a week, it labors greatly to start. Yesterday, after sitting for two weeks, it took about 10 seconds to start. Obviously, there is a bigger problem now. Yet, the reader still only shows a P0440 as an active code with both the P0440 and P0456 as permanent codes. Any ideas? There are 19 parts related to the Evap system as listed on ProDemand and I don’t want the dealer to rake me over the coals replacing expensive parts.

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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:** [April 20, 2020, 4:50pm UTC](https://community.cartalk.com/t/2017-chrysler-pacifica-p0440-evap-system-code-rough-start-after-sitting-a-couple-of-days/163121/2 "2020-04-20T16:50:07Z")

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If you can’t find a leak and the same code returns, there may be a problem with the vapor pressure sensor.

[https://www.moparpartsgiant.com/parts/mopar-detector-evaporative-system-integrit~4861962ab.html](https://www.moparpartsgiant.com/parts/mopar-detector-evaporative-system-integrit~4861962ab.html)

Tester

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<div class="post-metadata">

**Author:** ![mix2pix\_157323](https://avatars.discourse-cdn.com/v4/letter/m/f14d63/32.png) [@mix2pix\_157323](https://community.cartalk.com/u/mix2pix_157323)\
**Post date:** [April 20, 2020, 5:11pm UTC](https://community.cartalk.com/t/2017-chrysler-pacifica-p0440-evap-system-code-rough-start-after-sitting-a-couple-of-days/163121/3 "2020-04-20T17:11:45Z")

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Thanks so much for the info! That sounds like a great idea. I will pass this along to my mechanic as I am taking the van in tomorrow to be re-evaluated.