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2017 MKX Transmission Shudder and Hard Shifts - Is there a TSB?

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Mike T. · rep 0 · May 25, 4:33 AM · 1 replies · solved · Question

Vehicle: 2017 Lincoln MKX Reserve

I'm experiencing some really frustrating transmission issues with my 2017 Lincoln MKX Reserve, 2.7L EcoBoost. Lately, it's been having a noticeable shudder, especially when accelerating from a stop or at lower speeds around 20-30 mph. It also feels like it's clunking into gear sometimes, particularly during downshifts.

I've read online that other owners with the 8F57 transmission have had similar problems. Has anyone else dealt with this? I'm wondering if there's a known Technical Service Bulletin (TSB) or recall for this specific issue that I should be aware of before I take it to the dealer. Any advice on what to tell them or what to expect would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:33 AM

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The issues you're describing with your 2017 Lincoln MKX's 8F57 transmission are indeed common and have been reported by other owners. This transmission, while generally robust, can exhibit symptoms like shuddering, hesitation, and hard shifts.

Here's what you should know:

  1. Common Causes: The shuddering is often attributed to torque converter issues or problems with the internal clutch packs. Software calibration can also play a significant role in shift quality.
  2. TSBs: Yes, there have been several Technical Service Bulletins (TSBs) related to the 8F57 transmission for various Lincoln and Ford models. These TSBs often address:
    • Software Updates: Many TSBs recommend updating the Powertrain Control Module (PCM) and Transmission Control Module (TCM) software to the latest calibration. These updates can improve shift logic and address shudder concerns.
    • Fluid Service: Some TSBs specify a transmission fluid flush and refill with a specific type of Mercon ULV fluid, sometimes in conjunction with a software update.
    • Torque Converter Replacement: In more severe or persistent cases, the TSBs might lead to the recommendation of replacing the torque converter or even the entire transmission valve body.
  3. Diagnostic Codes: A dealer's diagnostic scan may reveal codes such as P0731 (Gear 1 Incorrect Ratio), P0732 (Gear 2 Incorrect Ratio), or other P07xx series codes indicating transmission performance issues. However, sometimes no codes are present even with noticeable symptoms.
  4. When to See a Shop: It's crucial to have this inspected by a Lincoln dealership or a reputable transmission specialist as soon as possible. Continuing to drive with these symptoms can potentially lead to more significant and costly damage.

Recommendation: When you take your MKX in, specifically mention the shudder and hard shifting. Ask them to check for any active TSBs related to the 8F57 transmission for your model year and to perform a comprehensive diagnostic scan, including checking for the latest software updates and transmission fluid condition. Be prepared for them to suggest a software reflash and/or a transmission fluid service as initial steps.

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