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2021 Highlander XLE - Delayed Shifting & Hard Shifts, No CEL Yet

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Brian F. · rep 0 · May 22, 2:15 AM · 1 replies · solved · Question

Vehicle: 2021 Toyota Highlander XLE

Hi everyone,

I'm experiencing some concerning transmission issues with my 2021 Toyota Highlander XLE, which has about 35,000 miles. Lately, I've noticed a delay in engagement when shifting from Park to Drive or Reverse, and sometimes the shifts between gears (especially 2nd to 3rd) feel quite harsh or 'clunky'. There's no Check Engine Light on yet, and I haven't pulled any codes.

This is my family vehicle, and I'm worried about potential long-term damage. Has anyone else had similar problems with their newer Highlander? What could be causing this, and what should I check before taking it to the dealership?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:15 AM

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ClearTheCode admin answer:

Delayed engagement and harsh shifts in your 2021 Toyota Highlander XLE, even without a Check Engine Light, are definitely symptoms that warrant immediate attention. Modern transmissions are complex, and these issues can range from simple to severe. Here's a breakdown of potential causes and what to do:

  1. Check Transmission Fluid Level and Condition:

    • Level: This is the first and most critical check. Low transmission fluid can cause delayed engagement and erratic shifting. Consult your owner's manual for the correct procedure to check the fluid level, as many newer Toyota transmissions are sealed units that require specific steps (often checking at a certain temperature).
    • Condition: Examine the fluid for color and smell. Healthy transmission fluid is typically red or light brown and has a slightly sweet smell. If it's dark brown or black, smells burnt, or contains metallic particles, it indicates significant internal wear and contamination.

  2. Transmission Control Module (TCM) / Software:

    • Sometimes, transmission issues can be resolved with a software update or a reset of the TCM's adaptive learning. The TCM learns your driving style, and sometimes this learning can become corrupted or lead to undesirable shift patterns. A dealership can check for available software updates.

  3. Solenoids and Valve Body:

    • Solenoids: These are electronic valves within the transmission that control fluid flow to engage different gears. A faulty or sticking solenoid can cause delayed or harsh shifts. While no CEL is on, a pending code (P07xx series) might be present that a more advanced scanner can read.
    • Valve Body: This is the hydraulic control center of the transmission. Issues with the valve body can lead to various shifting problems.

  4. Internal Transmission Wear:

    • Clutch packs, bands, or other internal components can wear out, especially if the transmission has been subjected to heavy loads or inadequate maintenance. This is a more serious and costly repair.

When to See a Shop: Given that your 2021 Highlander is still relatively new and under warranty, your first step should be to schedule an appointment with a Toyota dealership. Even without a Check Engine Light, they can perform a comprehensive diagnostic scan using their proprietary tools, which can often reveal pending codes or specific transmission performance data that generic OBD-II scanners cannot. Driving with noticeable transmission issues can exacerbate the problem and lead to more expensive repairs down the line. It's crucial to address this promptly to prevent further damage.

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