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Rough Shifting on my 2018 Lincoln MKX - Is this normal?

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Emily N. · rep 0 · May 22, 6:12 AM · 1 replies · solved · Question

Vehicle: 2018 Lincoln MKX Reserve

Hey everyone,

I've been noticing some really rough shifting in my 2018 Lincoln MKX Reserve lately, especially when it shifts from 2nd to 3rd gear, and sometimes from 3rd to 4th. It feels like a noticeable jolt or clunk, not smooth at all. It's got about 65,000 miles on it now.

Is this a common issue with the MKX or this specific transmission? I'm wondering if there's a known TSB (Technical Service Bulletin) for this problem or if it's something I should be seriously concerned about. I've tried to pay attention to when it happens, and it seems more pronounced when the car is cold, but it's still there even after it warms up.

Has anyone else experienced this with their Lincoln MKX from these model years? Any advice on what I should check or ask my mechanic to look for would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:12 AM

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Hello Sarah, rough shifting in your 2018 Lincoln MKX is definitely something to address, as it's not considered normal operation, especially if it's a recent development or worsening. This issue can stem from several common causes, and it's important to diagnose it properly to prevent further damage.

  1. Transmission Fluid Issues: The simplest cause could be low or degraded transmission fluid. Over time, fluid can break down or leak, leading to poor lubrication and erratic shifting. Check your fluid level and condition; if it's dark or smells burnt, it needs attention.
  2. Software Calibration: Often, harsh or delayed shifts can be resolved with a transmission control module (TCM) software update. Manufacturers frequently release Technical Service Bulletins (TSBs) for known shifting anomalies that can be corrected by recalibrating the transmission's shift points and pressures. Your dealership can check for applicable TSBs for your specific VIN.
  3. Worn Solenoids or Valve Body: The transmission's valve body contains solenoids that control fluid flow to engage different gears. If these solenoids become sticky, worn, or fail, they can cause harsh shifts, delays, or even prevent certain gears from engaging. A failing valve body itself can also lead to these symptoms.
  4. Diagnostic Trouble Codes (DTCs): If your check engine light is on, or even if it's not, a diagnostic scan can reveal specific transmission-related codes (P07xx series). Common codes associated with shifting issues include P0731 (Incorrect Gear Ratio, 1st Gear), P0732 (2nd Gear), P0733 (3rd Gear), P0734 (4th Gear), or P0720 (Output Speed Sensor Circuit Malfunction). These codes can help pinpoint the exact component or circuit causing the problem.

When to See a Shop: It's highly recommended to have your MKX inspected by a qualified technician as soon as possible, especially if the shifting is severe, accompanied by a check engine light, or if you notice any loss of power or unusual noises. Continuing to drive with a significant transmission issue can lead to more extensive and costly repairs. A professional can perform a thorough diagnostic, check for TSBs, and recommend the appropriate repair, which could range from a simple fluid change and software update to solenoid replacement or valve body service.

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