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Harsh Shifting and Hesitation in 2017 Genesis G70 3.3T

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Mike T. · rep 0 · May 25, 4:35 AM · 1 replies · solved · Question

Vehicle: 2017 Genesis G70 3.3T

Hello everyone,

I'm experiencing some concerning transmission issues with my 2017 Genesis G70 3.3T. The car has about 60,000 miles on it. Lately, I've noticed harsh shifts, especially when going from 1st to 2nd gear, and sometimes from 2nd to 3rd. It's not smooth at all; there's a definite jolt.

Additionally, there's a hesitation when downshifting, particularly when slowing down. It feels like the transmission is struggling to decide which gear to be in. No warning lights are on, but the driving experience has definitely degraded.

Has anyone with a G70 3.3T faced similar transmission behavior? What was the resolution? I'm worried about potential long-term damage.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:35 AM

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ClearTheCode admin answer:

Harsh shifting and hesitation in your 2017 Genesis G70 3.3T's transmission at 60,000 miles can be a symptom of several issues, ranging from simple to more complex. Here’s a guide to common causes and next steps:

  1. Transmission Fluid Level and Quality:

    • Cause: Low or degraded transmission fluid is a primary suspect. Old fluid loses its lubricating and cooling properties, leading to increased friction and poor shifting. Low fluid can cause pressure issues within the transmission.
    • Action: While many modern transmissions are 'sealed for life,' it's crucial to check the fluid level and condition. This often requires a specific procedure and temperature for accurate measurement. If the fluid is dark or smells burnt, a fluid and filter change is highly recommended.

  2. Transmission Software/Firmware:

    • Cause: Automotive manufacturers frequently release software updates for transmission control modules (TCMs) to improve shift quality, address known issues, and enhance performance.
    • Action: A dealership can check if there are any pending software updates for your specific G70 model and apply them. This is a relatively inexpensive potential fix.

  3. Solenoid or Valve Body Issues:

    • Cause: Solenoids within the transmission control the flow of fluid to engage different gears. If a solenoid is sticking or failing, it can cause harsh or delayed shifts. The valve body, which houses these solenoids, can also develop issues.
    • Action: Diagnosis typically involves scanning the TCM for specific fault codes (even if the check engine light isn't on, pending codes might exist) and potentially pressure testing. This usually requires a professional.

  4. Mechanical Wear:

    • Cause: Less common at 60,000 miles but possible, internal wear of clutch packs or other components can lead to shifting problems.
    • Action: This is usually a last resort diagnosis after other avenues are exhausted and would require transmission removal and inspection.

When to See a Shop: Given the complexity of modern transmissions, it's highly recommended to have your G70 inspected by a Genesis dealership or a transmission specialist. They have the necessary diagnostic tools to read specific transmission codes, check fluid levels correctly, and perform software updates. Addressing these issues early can prevent more significant and costly repairs down the line.

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