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2020 Mazda 3 Automatic Transmission Jerking - 2nd to 3rd Gear

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Mike T. · rep 0 · May 22, 4:48 AM · 1 replies · solved · Question

Vehicle: 2020 Mazda 3 Premium

Hi all,

I'm experiencing a concerning issue with my 2020 Mazda 3 Premium, which has the automatic transmission and about 45,000 miles on it. Lately, I've noticed a distinct jerking or harsh shift when the transmission goes from 2nd to 3rd gear. It's not constant, but it's happening more frequently, especially when the car is cold or under moderate acceleration.

It feels like a sudden lurch, and it's quite unsettling. All other shifts seem smooth, and there are no warning lights on the dash. I've heard some talk about transmission software updates for Mazda models, but I'm not sure if that applies to my year and model.

Has anyone else with a 2020 Mazda 3 experienced similar transmission behavior? What was your experience, and what was the solution? Any insights would be greatly appreciated before I take it to the dealership.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:48 AM

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ClearTheCode admin answer:

Harsh shifting, particularly between specific gears, is a common concern that can stem from several factors in modern automatic transmissions. For your 2020 Mazda 3, here's what to consider:

  1. Check Transmission Fluid Level and Condition:

    • Cause: Low or degraded transmission fluid is a primary cause of shifting issues. Old fluid loses its lubricating and hydraulic properties, leading to increased friction and poor pressure control.
    • Action: While many modern transmissions are considered 'sealed for life,' it's crucial to ensure the fluid level is correct and the fluid isn't burnt or discolored. This typically requires a specialized dipstick or a shop visit, as there might not be an easily accessible dipstick for owners.

  2. Software Updates (PCM/TCM):

    • Cause: Manufacturers often release software updates for the Powertrain Control Module (PCM) or Transmission Control Module (TCM) to refine shift logic, address known issues, or improve overall performance.
    • Action: Contact your Mazda dealership. They can check if there are any outstanding Technical Service Bulletins (TSBs) or software updates available for your specific 2020 Mazda 3 model that address transmission shifting concerns.

  3. Transmission Solenoid Issues:

    • Cause: Solenoids control the flow of transmission fluid to engage different gears. A faulty or sticking solenoid can cause delayed or harsh shifts.
    • Action: Diagnosis usually involves specialized scanning tools to monitor solenoid operation. This is a job for a professional transmission shop.

  4. Internal Transmission Wear:

    • Cause: Less commonly, but possible, internal wear of clutch packs or other components can lead to shifting problems, especially at higher mileage.
    • Action: This is a more serious and costly repair, requiring transmission disassembly or replacement.

When to See a Shop: Given that there are no warning lights, but the issue is persistent, it's highly recommended to have your 2020 Mazda 3 inspected by a Mazda dealership or a reputable transmission specialist. They have the diagnostic tools to read transmission-specific codes (even if the check engine light isn't on), check fluid parameters, and determine if a software update or a more involved repair is necessary. Addressing this promptly can prevent further damage to the transmission.

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