2018 Lincoln MKC Problems

What owners report

Complaints for this model year cluster around the 2.0L EcoBoost engine: owners describe coolant disappearing or leaking into a cylinder, rough starting and misfires, and dealers concluding the engine or long block needs replacing. Reports usually appear between roughly 37,000 and 75,000 miles, and many owners say they were told nothing could be done outside warranty. A smaller group of complaints concerns a battery monitor sensor recall where replacement parts were unavailable for months.

1. 1
   Engine

   Coolant leaking into the engine / engine replacement

   • 43 complaints (57%)
   • median 63,174 mi at 7.5 yrs old (10 state mileage)
   • owner-quoted repair $8,020 (median of 13 quotes)
   • filed 2021–2026

   Owners describe a check-engine light, a rough idle or misfire, a coolant level that keeps dropping with no visible puddle, and sometimes white smoke from the exhaust. According to the complaints, dealers and independent shops diagnosed coolant entering a cylinder and told owners the engine or long block had to be replaced, with quoted costs frequently reported in the five-figure range. Several owners say a service bulletin covering this condition exists, and that they were told there was no recall or customer program to help. Mostly reported between roughly 37,000 and 75,000 miles, with a few at higher mileage, often noticed during routine driving or a cold start.

   3 related service bulletins

   What to check: Ask for service records showing whether coolant-intrusion diagnostics or a long-block replacement were done, and check the coolant reservoir level before and after a test drive. A pre-purchase cooling-system pressure test and cylinder leak-down or combustion-gas test is worth doing on any 2.0L example.

   2 excerpts from owner complaints in NHTSA records

   “I have a 2018 Lincoln MKC with approximately 58,000 miles, always taken care of and maintained, in excellent condition. Almost immediately after my extended warranty ran out the check engine light came on and it started to start and idle rough. Took it to a Lincoln dealer, they replaced coil assembly # 4 and the 4 spark plugs, told me if it continues there might be coolant intrusion to the engine and the engine would need to be replaced. …”

   NHTSA complaint #11673866, filed 2025-07

   “I have the 2.0L EcoBoost I-4 (assembled December 2017, engine block part number HV 206 AA) in my 2018 Lincoln MKC Black Label. The head gasket failed at 37,000 miles in May 2023, according to my Ford/Lincoln dealer. It started as intermittent misfiring/running rough with the check engine light illuminated. My scanner detected the code P0301 cylinder one misfire. My coolant reservoir tank level also gradually decreased, with no visible leakage. …”

   NHTSA complaint #11612919, filed 2024-09
2. 2
   Engine

   Rough idle and repeat misfires

   • 16 complaints (21%)
   • median 59,674 mi at 7.5 yrs old (6 state mileage, few)
   • owner-quoted repair $8,020 (median of 7 quotes)
   • filed 2022–2026

   Owners report the engine shaking or idling roughly, especially at cold start, with misfire codes traced to a single cylinder. They describe replacing spark plugs and ignition coils, sometimes more than once, only for the misfire to return a short time later. In many accounts this led to a diagnosis of coolant entering the cylinder and the engine needing replacement. Typically noted from about 40,000 to 75,000 miles, often first noticed at start-up in the morning.

   2 related service bulletins

   What to check: Have the vehicle scanned for stored misfire codes before buying and ask whether plugs and coils were already replaced and whether the misfire came back. Repeat misfires on this engine are often a sign of coolant loss, so check the coolant level and ask for leak-test results.

   2 excerpts from owner complaints in NHTSA records

   “The check engine light came on and it would run rough when started. It was determined the number four cylinder head was cracked, allowing antifreeze to leak into the engine block. I bought the car new in January 2019. The problem appeared with under 57,000 actual miles. The car has always been serviced on time at the dealership. The cost to fix the problem with a new engine is approximately $10,000. I bought the car new so that I would not have problems. It is my only form of transportation. …”

   NHTSA complaint #11711534, filed 2026-01

   “I own a 2018 Lincoln MKC equipped with the 2.0L EcoBoost engine. The vehicle currently has approximately 72,326 miles. The check-engine light initially illuminated and an OBD scan produced code P0303, indicating a misfire in Cylinder 3. No other diagnostic codes were reported. Following mechanical evaluation, all four spark plugs and ignition coils were replaced. Approximately 145 miles later, the check-engine light returned with the same P0303 code. …”

   NHTSA complaint #11763701, filed 2026-09
3. 3
   Engine cooling

   Engine cutting off or overheating while driving

   • 8 complaints (11%)
   • median 41,000 mi at 8.1 yrs old (3 state mileage, few)
   • filed 2023–2026

   Owners describe the engine shutting off while the vehicle was moving, or revving unexpectedly and then stalling with no warning light, leaving them to coast to the shoulder and call a tow. Other complaints describe an over-temperature message or the engine overheating during a drive, followed by a dealer diagnosis of engine failure. Several owners report that the underlying diagnosis was coolant loss or intrusion. Reported from roughly 41,000 to 92,000 miles, often on the highway or during normal driving rather than while parked.

   What to check: Ask whether the vehicle has ever stalled or overheated and for any related repair invoices, and check the coolant level and look for warning lights during a test drive that includes a sustained highway stretch.

   2 excerpts from owner complaints in NHTSA records

   “I was driving home from work on December 24th 2025 and my 2018 lincoln mkc 2.3l shut off on me while I was in motion. There were several cars that had to swerve and not hit me. The car would not start but I was able to put the vehicle in neutral and roll to the shoulder of the road. I was very scared and angry because this vehicle only has 54,646 miles currently, give or take 50 miles. I had to get the towed to my home. This needs to be resolved and Fird/Lincoln needs to faithfully fix this dangerous defect, i could have died. …”

   NHTSA complaint #11707235, filed 2025-12

   “Engine failure due to coolant leak. Causing vehicle to overheat without warning while traveling down highway Issue has been reported to service center No other inspection No warning indicated.”

   NHTSA complaint #11660410, filed 2025-05
4. 4
   Engine

   Battery monitor sensor recall with parts unavailable

   Mentioned in 5 of 60 sampled complaints

   Owners describe receiving notice of a recall for a battery monitor sensor that can overheat and start a fire in the engine compartment, then being told the replacement part was on backorder with no date. Several say the vehicle stayed unrepaired for many months and that they limited where they parked it in the meantime. One owner reported that only the other open recall on the vehicle was completed at the visit. Reported at a range of mileages, mainly from mid-2023 onward after the recall notice went out.

   Recall 23V378000

   What to check: Have the dealer confirm by VIN that the battery monitor sensor recall work has actually been completed and not just ordered, and keep the repair receipt with the vehicle paperwork.

   2 excerpts from owner complaints in NHTSA records

   “My car was recalled by Lincoln in May 2023 because a battery sensor causes the car to catch on fire anytime, on or off. I have had my car in to Lincoln 2 times since then and there are no parts to fix the recall. Lincoln says the sensors are on back order and they don't know when they will be available, no end date. My car can combust at anytime and Lincoln has no idea when they will have the part to fix it! …”

   NHTSA complaint #11550438, filed 2023-10

   “The contact owns a 2018 Lincoln MKC. The contact stated that while starting the vehicle, the battery warning light and other unknown warning lights illuminated. The contact had received notification of NHTSA Campaign Number: 23V378000 (Engine) however, the part to do the recall repair was not yet available. The contact stated that the dealer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the failure but confirmed that parts were not yet available. The vehicle was not repaired. …”

   NHTSA complaint #11542613, filed 2023-09, 60,000 miles

Buying note. The thing to establish before buying this model year is whether the engine has already been replaced or repaired for coolant loss, and to get that in writing. It is also worth confirming which open recalls on the specific vehicle have actually been completed rather than only scheduled.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.