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2021 LS 500 Transmission Shifting Issues - Delayed Engagement

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Ryan M. · rep 0 · May 22, 4:38 AM · 1 replies · solved · Question

Vehicle: 2021 Lexus LS 500 F Sport

Hi everyone,

I'm experiencing some concerning transmission issues with my 2021 Lexus LS 500 F Sport, which has around 30,000 miles. Over the past week, I've noticed a significant delay in engagement when shifting from Park to Drive or Reverse. It takes a few seconds, sometimes with a slight clunk, before it engages. Also, during normal driving, the shifts feel a bit rougher than usual, especially at lower speeds.

There's no Check Engine Light on yet, and I haven't pulled any codes with my scanner. I'm hoping it's not a major transmission problem, as the car is still relatively new. Could it be low transmission fluid, or something electronic like a solenoid?

Any advice or similar experiences with the 10-speed automatic in the LS 500 would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:38 AM

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ClearTheCode admin answer:

Delayed engagement and rough shifting in your 2021 Lexus LS 500 F Sport are definite signs of a transmission issue that needs prompt attention. Even without a Check Engine Light, the symptoms indicate a problem within the sophisticated 10-speed automatic transmission.

Here are potential causes and diagnostic steps:

  1. Transmission Fluid Level and Condition: This is the first and easiest thing to check, though many modern transmissions are 'sealed for life' or require specific procedures. Low fluid can cause engagement and shifting problems. Contaminated or burnt fluid can also indicate internal wear. Note: Checking fluid on sealed transmissions often requires specific tools and temperature ranges.
  2. Transmission Solenoids: The transmission uses multiple solenoids to control fluid flow and engage different gears. A failing or sticking solenoid can cause delayed engagement, harsh shifts, or prevent certain gears from engaging. These often trigger specific transmission-related diagnostic trouble codes (DTCs), typically starting with P07xx.
  3. Valve Body Issues: The valve body is the 'brain' of the automatic transmission, directing fluid pressure to various clutches and bands. Wear or blockages within the valve body can lead to shifting problems.
  4. Transmission Control Module (TCM): The TCM is the electronic unit that controls the transmission. A fault in the TCM or its wiring could lead to incorrect shifting commands. While less common, it's a possibility.
  5. Internal Wear/Damage: In more severe cases, internal components like clutches, bands, or planetary gears could be worn or damaged. This is less likely at 30,000 miles but not impossible.

When to See a Shop:

  • Immediately. Transmission issues can quickly worsen and lead to more expensive repairs if not addressed. Continuing to drive with delayed engagement or harsh shifts can cause further damage to internal components.
  • A Lexus dealership or a reputable transmission specialist is highly recommended. They have the specialized diagnostic equipment (like Techstream) to read transmission-specific codes, monitor live data from solenoids, and perform comprehensive transmission health checks.
  • Given the vehicle's age and mileage, it's very likely still under the factory powertrain warranty. Contacting your Lexus dealership first is advisable to ensure any diagnosis and repair are covered.
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