# 2018 Sonata limp mode

**URL:** <https://community.cartalk.com/t/2018-sonata-limp-mode/143477>\
**Category:** Maintenance/Repairs\
**Tags:** hyundai, sonata\
**Created:** [July 2, 2019, 1:31am UTC](https://community.cartalk.com/t/2018-sonata-limp-mode/143477 "2019-07-02T01:31:48Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [July 2, 2019, 1:43am UTC](https://community.cartalk.com/t/2018-sonata-limp-mode/143477/8 "2019-07-02T01:43:01Z")

</div>

There’s very few service bulletins on the 2018 Sonata non-turbo, non-hybrid 2.4L engine. Nothing that would obviously cause this symptom. I’m seeing no reference to harness problems either, but that info may not appear in the service bulletin database yet.

I seen to recall a discussion here about this issue, a software update results in needing a new wiring harness. Doesn’t apply specifically to the Sonata, but to some Hyundai engine configurations. You might try the forum search feature. Upper right on this page. Here’s one I found

> [@2018 Hyundai Sonata - Wiring issue](https://community.cartalk.com/t/2018-hyundai-sonata-wiring-issue/134559):
>
> I purchased my 2018 Sonata 5/2018. I took it in for it’s 1st check up & oil change 1/22/19 @ only 4k miles. They also did an ‘update’. As I drove home, the car was losing power. Took it back to the dealer who finally determined it needed a new major harness. Still waiting for my car 2/12/19. How bad is this? Potential future problems? Other thoughts? Thanks!

---

_[View the full topic](https://community.cartalk.com/t/2018-sonata-limp-mode/143477)._