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2017 Mazda 6 Touring - Hard Shifting and Transmission Jerk

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Angela R. · rep 0 · May 22, 4:47 AM · 1 replies · solved · Question

Vehicle: 2017 Mazda 6 Touring

I'm having some concerning transmission issues with my 2017 Mazda 6 Touring (2.5L engine, automatic). Lately, it's been shifting very hard, especially from 1st to 2nd gear, and sometimes from 2nd to 3rd. It feels like a noticeable jerk or clunk. It's most prominent when the engine is cold, but it can happen even after driving for a while.

I haven't seen any check engine lights or transmission warning lights come on, and my OBD-II scanner isn't showing any codes. I'm worried this could be a sign of a bigger problem. Has anyone else experienced this with their Mazda 6? What should I be looking at?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:47 AM

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ClearTheCode admin answer:

Hard shifting and jerking in an automatic transmission, even without a Check Engine Light, can indicate several issues ranging from simple maintenance to more complex internal problems. While your scanner might not show generic OBD-II codes, a more advanced scanner can often pull manufacturer-specific transmission codes.

Common Causes:

  • Low or Dirty Transmission Fluid: This is the most common and easiest to check. Low fluid levels can cause pressure issues, leading to hard shifts. Dirty fluid can reduce lubrication and clog internal components.
  • Transmission Solenoid Issues: Solenoids control the flow of transmission fluid to engage different gears. A faulty or sticking solenoid can cause delayed or harsh shifts.
  • Transmission Control Module (TCM) Problems: The TCM manages the transmission's operation. Software glitches or hardware failures can lead to erratic shifting.
  • Valve Body Issues: The valve body directs fluid pressure to the clutches and bands. Wear or blockages can cause shifting problems.
  • Internal Transmission Wear: In more severe cases, worn clutches or other internal components can cause these symptoms.

Diagnostic Steps:

  1. Check Transmission Fluid Level and Condition: Refer to your owner's manual for the correct procedure to check the transmission fluid. Ensure it's at the correct level and look at its color and smell. It should be reddish and not smell burnt. If it's dark or smells burnt, a fluid and filter change might be necessary.
  2. Scan for Manufacturer-Specific Codes: A generic OBD-II scanner may not show transmission-specific codes. A more advanced diagnostic tool, often available at a dealership or independent shop, can read these codes.
  3. Reset Transmission Adaptive Learning: Sometimes, the transmission's computer can 'learn' bad habits. A professional can reset the adaptive learning values, which might resolve minor shifting issues.

When to See a Shop:

  • If checking the fluid level and condition doesn't resolve the issue.
  • If you suspect a solenoid or valve body problem, as these require specialized knowledge and tools.
  • If you need to scan for manufacturer-specific transmission codes.
  • If the problem worsens or if you notice any new noises or smells. Addressing transmission issues early can prevent more costly repairs down the line.
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