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Rough Shifting & Jerking in My 2018 Q50 3.0t - Is this normal?

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Mike T. · rep 0 · May 25, 3:51 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 3.0t Luxe

Hey everyone,

I've been noticing some really rough shifts and jerking, especially when downshifting at lower speeds, in my 2018 Infiniti Q50 3.0t. It's got about 65,000 miles on it. Sometimes, it feels like the transmission is confused about which gear to be in, leading to a noticeable lurch.

I'm worried this might be a sign of a bigger transmission issue. Has anyone else experienced this with their Q50? What could be causing it? Should I be concerned about the reliability of the 7-speed automatic transmission in these cars? Any advice on what to check or ask my mechanic would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:51 AM

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ClearTheCode admin answer:

Rough shifting and jerking in your 2018 Infiniti Q50 3.0t can be a concerning issue. While some Infiniti transmissions can exhibit characteristics that feel 'firm,' consistent jerking or harsh shifts often point to an underlying problem. Here's what you should consider:

  1. Check for Diagnostic Trouble Codes (DTCs): Even if your check engine light isn't on, a pending code related to the transmission control module (TCM) might be present. Common codes could include P0700 (Transmission Control System Malfunction), P0715 (Input/Turbine Speed Sensor Circuit Malfunction), or P0720 (Output Speed Sensor Circuit Malfunction).
  2. Transmission Fluid Condition: Inspect the transmission fluid level and condition. Low or degraded fluid can cause shifting issues. Infiniti specifies a particular fluid (Nissan Matic S or J, depending on the year/transmission variant). If the fluid is dark, smells burnt, or is low, it needs attention.
  3. Software Updates: Sometimes, harsh shifting can be resolved with a Transmission Control Module (TCM) software update. Infiniti occasionally releases updates to refine shifting logic and performance. Check with a dealership or a specialist if there are any applicable TSBs (Technical Service Bulletins) for your specific VIN.
  4. Valve Body Issues: The valve body is a common component that can cause erratic shifting if its solenoids or passages become worn or clogged. This is a more involved repair.
  5. Torque Converter: Less common, but a failing torque converter can also contribute to shuddering or inconsistent power delivery.

When to See a Shop:

  • Immediately if the jerking is severe, accompanied by a burning smell, or if the vehicle enters 'limp mode' (reduced power/restricted gears).
  • As soon as possible if the issue is consistent and not intermittent. Prolonged driving with transmission problems can lead to more extensive and costly damage.

It's best to have a qualified Infiniti technician or a reputable transmission specialist diagnose the issue. They have the specific diagnostic tools and knowledge to accurately pinpoint the cause.

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