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2020 Sorento Rough Shifting and Hesitation at Low Speeds

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Mike T. · rep 0 · May 22, 3:12 AM · 1 replies · solved · Question

Vehicle: 2020 Kia Sorento EX

Hi all, I'm having some issues with the transmission in my 2020 Kia Sorento EX, which has the 8-speed automatic. Over the past few weeks, I've noticed it's been shifting pretty roughly, especially between 1st and 3rd gear. It's not smooth at all, and sometimes there's a noticeable jolt.

Also, when I'm driving at low speeds, like in stop-and-go traffic or pulling out of a driveway, there's a hesitation before it engages properly. It feels like it's struggling to decide which gear to be in. Has anyone else experienced this with their 2020 Sorento? Is this a known issue with this transmission, or could it be something simple like a software update?

I'm trying to avoid a costly repair if possible, so any insights into common causes or potential fixes would be really helpful before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:12 AM

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ClearTheCode admin answer:

Rough shifting and hesitation at low speeds in your 2020 Kia Sorento are common complaints that can stem from several sources, particularly with modern multi-speed automatic transmissions. It's important to address this promptly to prevent further issues.

Here's a breakdown of potential causes and steps:

  1. Transmission Fluid Level/Quality: While less common in newer sealed transmissions, an incorrect fluid level or degraded fluid can cause shifting problems. However, this usually requires specialized tools to check correctly.
  2. Software Glitch/Update: Modern transmissions are heavily controlled by software. A common cause for erratic shifting is outdated or corrupted transmission control module (TCM) software. Kia often releases software updates to refine shift logic and address known issues. This is a relatively easy fix if applicable.
  3. Transmission Solenoids: These electronic valves control the flow of transmission fluid to engage different gears. Faulty or sticking solenoids can lead to rough shifts or delays.
  4. Valve Body Issues: The valve body is the hydraulic control center of the transmission. Problems here can cause a range of shifting irregularities.
  5. Diagnostic Trouble Codes (DTCs): Even without a check engine light, the transmission control module (TCM) might have stored codes. A common code indicating a general transmission problem is P0700 (Transmission Control System Malfunction), which often points to other, more specific transmission-related codes stored within the TCM. Other codes like P0731 (Incorrect Gear Ratio 1st Gear) or P0741 (Torque Converter Clutch Circuit Performance) could also be present.

When to See a Shop: You should schedule an appointment with a Kia dealership or a trusted transmission specialist as soon as possible. They can perform a diagnostic scan to check for stored codes, inspect the transmission fluid (if accessible), and check for any available software updates. Driving with a transmission that is shifting poorly can accelerate wear on internal components, potentially leading to more expensive repairs down the line. Early diagnosis is key.

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