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G70 3.3T Transmission acting up - Hesitation and Hard Shifts at 55k miles

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

Vehicle: 2019 Genesis G70 3.3T Advanced

Hi Genesis Forum,

I'm experiencing some concerning transmission behavior in my 2019 Genesis G70 3.3T Advanced. It has about 55,000 miles on the odometer. Lately, I've noticed a distinct hesitation, particularly when engaging drive or reverse after a cold start. It takes a second or two longer than usual to 'clunk' into gear.

Additionally, I'm getting some noticeably hard shifts, especially the 2-3 and 3-4 shifts under moderate acceleration. It's not constant, but frequent enough to be worrying. There's no check engine light on, and no specific codes are showing up when I scan with my OBDII tool. Has anyone else with a G70 3.3T experienced similar issues with their 8-speed automatic transmission? What should I be looking into?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Transmission hesitation and hard shifts on your 2019 Genesis G70 3.3T can be concerning, especially without a Check Engine Light. The 8-speed automatic transmission (ZF 8HP or Hyundai's own 8-speed) is generally robust, but issues can arise. Here's a breakdown of potential causes and what to consider:

  1. Adaptive Learning: Modern transmissions have adaptive learning capabilities, meaning they adjust shift points and pressures based on driving style. Sometimes, aggressive driving or sudden changes in driving patterns can cause the transmission to 'learn' undesirable shift characteristics. A transmission reset (often requiring a dealership tool) can clear these learned values and allow the transmission to re-learn from scratch.
  2. Transmission Fluid Level and Condition: This is a critical first check. Low transmission fluid or fluid that is old and degraded can cause a multitude of shifting problems. While many modern transmissions are considered 'sealed for life,' fluid degradation can still occur. A professional can check the fluid level (which often requires specific procedures and temperature ranges) and assess its condition.
  3. Valve Body Issues: The valve body is the 'brain' of the automatic transmission, directing fluid pressure to engage clutches and bands. Issues with solenoids or passages within the valve body can lead to inconsistent or harsh shifts. This is a more complex diagnosis.
  4. Software Updates: Manufacturers often release software updates for the Transmission Control Module (TCM) to improve shift quality, address known issues, or refine performance. A visit to the dealership can confirm if any updates are available for your vehicle's TCM.
  5. Mechanical Wear: While less likely at 55,000 miles, internal wear on clutch packs or other components could contribute to shifting issues. This would typically be a more severe problem.

When to See a Shop:

  • If the problem persists after checking basic items (like ensuring no obvious external leaks), or if the hard shifts become more frequent or severe, it's crucial to have a qualified Genesis technician inspect the vehicle. They have specialized diagnostic tools to read transmission-specific codes (even if no CEL is present), check fluid levels correctly, and assess the health of the valve body and other internal components. Early diagnosis can prevent more costly repairs down the line.
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