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Rough Shifting & Hesitation in my 2017 Sorento Transmission

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Mike T. · rep 0 · May 25, 2:12 AM · 1 replies · solved · Question

Vehicle: 2017 Kia Sorento LX

Hi everyone,

I own a 2017 Kia Sorento LX with about 85,000 miles, and I've been experiencing some concerning transmission issues lately. The shifts feel really rough, especially between 2nd and 3rd gear, and sometimes it hesitates before engaging a gear, almost like it's slipping.

It's an automatic transmission, and the problem seems to be getting worse, particularly during city driving. I'm worried about potential long-term damage if I don't address this soon. Has anyone with a 2017 Sorento or similar model experienced these kinds of transmission problems? What was the fix?

I'm hoping it's something minor like a fluid change or a sensor, but I'm bracing for worse news. Any advice on what to look for or ask the mechanic would be helpful.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:12 AM

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ClearTheCode admin answer:

Rough shifting, hesitation, and slipping sensations in an automatic transmission like your 2017 Kia Sorento are definite red flags. These symptoms can stem from various issues, ranging from simple maintenance needs to more complex internal transmission problems.

Here's a breakdown of potential causes and what to do:

  1. Check Transmission Fluid:
    • Low Fluid Level: Insufficient transmission fluid is a common cause of shifting problems. It can lead to poor hydraulic pressure.
    • Contaminated Fluid: Old, dirty, or burnt transmission fluid can degrade its lubricating and cooling properties, affecting shift quality.
  2. Diagnostic Scan: A professional shop will connect a diagnostic scanner to check for Transmission Control Module (TCM) related trouble codes. Common codes for these symptoms include:
    • P0700 (Transmission Control System Malfunction): A generic code indicating an issue with the TCM.
    • P0731, P0732, P0733, etc. (Incorrect Gear Ratio): These codes specifically point to issues with specific gear engagement, suggesting slipping or incorrect shifts.
    • P0741 (Torque Converter Clutch Circuit Performance or Stuck Off): Can cause slipping or shuddering.
  3. Common Causes for Sorento Transmissions:
    • Solenoid Issues: Malfunctioning shift solenoids can prevent proper fluid flow, leading to harsh or delayed shifts.
    • Valve Body Problems: The valve body directs fluid to different clutch packs. Wear or blockages can cause shifting anomalies.
    • Internal Wear: Worn clutch packs or bands within the transmission itself can lead to slipping.
  4. Software Updates: Sometimes, transmission shifting issues can be resolved with a software update to the TCM, which recalibrates shift points and logic.

When to See a Shop: Given the worsening symptoms, you should take your Sorento to a qualified mechanic or a Kia dealership as soon as possible. Continuing to drive with a slipping or harshly shifting transmission can accelerate internal wear and lead to much more expensive repairs, potentially requiring a complete transmission rebuild or replacement. Early diagnosis can often prevent minor issues from becoming major ones.

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