NHTSA Complaint #11665955 — 2020 FORD MUSTANG

ENGINE issue reported to NHTSA

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Complaint Details

ODI Number	11665955
Vehicle	2020 FORD MUSTANG
Component	ENGINE
Date of Incident	May 25, 2025
Date Filed	June 10, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	TX

Consumer Description

2020 and above Mustang Ecoboost 2.3L engines are supposed to have the revised engine block design to mitigate coolant intrusion into cylinders and head gasket leak issues. My 2020 model year Mustang Ecoboost with the updated block, is suffering from coolant intrusion into cylinder #1. Confirmed by independent ASE certified repair shop as well as Ford dealership. No Codes. Symptoms includes cold start misfires and cold start white smoke from exhaust. MPG was inconsistent as well since the air/fuel ratio is disturbed by coolant intrusion. Car is at roughly 37K miles. IF ISSUE IS NOT REMEDIED, YOUR ENGINE MAY BLOW UP DURING OPERATION WITHOUT WARNING.

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