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2017 MKZ Transmission Slipping and Hard Shifts

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Mike T. · rep 0 · May 25, 4:28 AM · 1 replies · solved · Question

Vehicle: 2017 Lincoln MKZ 2.0L FWD

My 2017 Lincoln MKZ, 2.0L FWD, has been acting really strange lately. When I'm driving, especially at lower speeds or when accelerating from a stop, it feels like the transmission is slipping. The RPMs will flare up, but the car doesn't accelerate smoothly.

Also, I've noticed some pretty harsh shifts, particularly from 1st to 2nd gear and sometimes downshifting. It's not consistent, but it's happening more frequently now. The check engine light came on yesterday.

Has anyone else experienced this with their MKZ? I'm worried about major transmission problems.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:28 AM

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ClearTheCode admin answer: Transmission slipping and harsh shifts in your 2017 Lincoln MKZ are common indicators of internal transmission issues. The check engine light further confirms a detected fault.

Common Causes:

  1. Low or Contaminated Transmission Fluid: Insufficient fluid levels or degraded fluid can lead to poor hydraulic pressure and lubrication, causing slipping and hard shifts.
  2. Solenoid Issues: Transmission solenoids control fluid flow to engage gears. Faulty solenoids can result in incorrect gear engagement or delayed shifts.
  3. Valve Body Problems: The valve body directs transmission fluid. Wear or blockages can disrupt proper gear changes.
  4. Internal Wear: Components like clutch packs or bands can wear out over time, leading to loss of friction and slipping.
  5. Software Glitches: Sometimes, transmission control module (TCM) software can cause erratic shifting behavior.

Diagnostics:

  • OBD-II Codes: Expect codes like P0700 (Transmission Control System Malfunction), P0731 (Gear 1 Incorrect Ratio), P0732 (Gear 2 Incorrect Ratio), or P07XX series codes indicating specific gear ratio errors.
  • Fluid Inspection: A technician will check the transmission fluid level and condition.
  • Scan Tool Data: Live data from a diagnostic scan tool can reveal solenoid operation, shift pressures, and other critical parameters.

When to See a Shop: You should take your MKZ to a qualified automotive shop immediately. Driving with a slipping transmission can cause further internal damage, potentially leading to a more expensive repair or complete transmission failure. A professional diagnosis is crucial to pinpoint the exact cause and recommend the appropriate repair, which could range from a fluid flush and filter change to solenoid replacement or even a transmission rebuild/replacement.

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