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2020 ES 350 Transmission Hesitation and Hard Shifts

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Ashley M. · rep 0 · May 22, 4:40 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus ES 350 Luxury

Hi everyone,

I'm experiencing some concerning transmission behavior with my 2020 Lexus ES 350 Luxury, which has about 45,000 miles. Lately, I've noticed a distinct hesitation when accelerating from a stop, almost like a delay before the power kicks in. It's not smooth at all.

Additionally, the shifts, especially in lower gears (1st to 2nd, 2nd to 3rd), feel much harder and clunkier than they used to be. It's not consistent, but it happens frequently enough to be worrying. There's no check engine light on, but I'm worried about potential transmission problems.

Has anyone else with a newer ES 350 experienced similar issues? What was the diagnosis or solution?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:40 AM

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ClearTheCode admin answer:

Transmission hesitation and hard shifts in a relatively new vehicle like your 2020 Lexus ES 350 are definitely concerning and warrant immediate attention. While there's no check engine light, a diagnostic scan can still reveal pending transmission-related codes.

Common Causes:

  1. Low or Contaminated Transmission Fluid: This is a primary suspect. Low fluid levels can cause pressure issues, leading to hesitation and hard shifts. Contaminated or old fluid loses its lubricating and hydraulic properties.
  2. Transmission Solenoid Issues: Solenoids control the flow of transmission fluid to engage gears. A faulty or sticking solenoid can cause delayed or harsh shifts.
  3. Valve Body Problems: The valve body directs transmission fluid to the appropriate clutches and bands. Issues here can lead to erratic shifting.
  4. Software Glitch/Adaptive Learning: Sometimes, the transmission control module (TCM) software can develop glitches or its adaptive learning can become confused, requiring a reset or reflash.
  5. Internal Wear: While less likely at 45,000 miles, internal wear on clutches or bands can cause these symptoms.

Troubleshooting Steps:

  1. Check Transmission Fluid: Have a qualified technician check the transmission fluid level, condition, and color. Lexus transmissions are often sealed, making this a job for a professional.
  2. Diagnostic Scan: Even without a check engine light, a professional scan tool can read transmission-specific trouble codes (e.g., P07xx series) and live data from sensors.
  3. Software Update/Reset: In some cases, a TCM software update or a reset of the adaptive learning values can resolve shifting anomalies.
  4. Road Test and Inspection: A technician should perform a road test to observe the shifting behavior under various conditions and inspect for any external leaks or damage.

When to See a Shop:

  • Immediately: Any persistent or worsening transmission issues should be addressed by a Lexus dealership or a reputable transmission specialist as soon as possible. Continuing to drive with these symptoms can lead to more severe and costly damage. Do not delay, as early diagnosis can often prevent major repairs.
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