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2020 G70 3.3T Rough Shifting and Hesitation at Low Speeds

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Mike T. · rep 0 · May 25, 4:40 AM · 1 replies · solved · Question

Vehicle: 2020 Genesis G70 3.3T

I've got a 2020 Genesis G70 3.3T, and lately, the transmission feels really off. I'm noticing rough shifts, especially in lower gears (1st to 2nd, 2nd to 3rd), and sometimes there's a noticeable hesitation when accelerating from a stop or at low speeds. It's not consistent, but it's happening more frequently.

It's got around 45,000 miles on it, and I'm concerned about the long-term reliability. Has anyone else with a 2020 G70 3.3T experienced similar transmission behavior? Are there any known issues or TSBs for the 8-speed automatic in these cars? I'm hoping it's just a software update needed, not something more serious.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:40 AM

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ClearTheCode admin answer:

Experiencing rough shifts and hesitation in your 2020 Genesis G70 3.3T at 45,000 miles can be concerning, but it's often a fixable issue. The 8-speed automatic transmission in these vehicles is generally robust, but can benefit from specific attention.

  1. Check for Transmission Control Module (TCM) Software Updates: Genesis has released TSBs for transmission software updates on various models and years, including the G70, to address shifting anomalies, hesitation, and overall drivability. These updates optimize shift points and clutch engagement. This is often the first and least invasive solution.
  2. Inspect Transmission Fluid: While many modern transmissions are considered 'sealed for life,' fluid degradation can occur, especially under spirited driving. A qualified technician can check the fluid level and condition. If the fluid is dark or smells burnt, it might indicate internal wear or the need for a fluid flush/change, though this is less common at 45k miles unless the vehicle has been subjected to extreme conditions.
  3. Causes:
    • TCM Software Glitches: The most common cause for intermittent rough shifts or hesitation.
    • Worn Transmission Fluid: Can lead to poor lubrication and increased friction.
    • Valve Body Issues: Less common, but can cause inconsistent fluid pressure and shifting problems.
    • Sensor Malfunctions: Speed sensors or other transmission sensors can send incorrect data to the TCM.
  4. OBD Codes: If the issue is severe enough, it might trigger a Check Engine Light and store codes related to the transmission. Common codes could include:
    • P0700: Transmission Control System Malfunction (general code, will be accompanied by specific manufacturer codes).
    • P0731, P0732, etc.: Incorrect Gear Ratio for specific gears.
  5. When to See a Shop:
    • Immediately if the issue is persistent, severe, or accompanied by any warning lights on the dashboard.
    • If a software update doesn't resolve the problem.
    • To have the transmission fluid inspected and potentially changed.

It's crucial to have a Genesis-trained technician diagnose this, as specialized tools and knowledge are required for proper transmission diagnostics and software updates.

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