There are 3 owner-reported engine complaints for the 2023 Nissan Altimain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The engine mounted high pressure fuel pump became loose and unseated because the engine-side mounting threads failed. The pump lifted off its mounting surface, the head of the engine, and oil came out around the top of the engine. This failure caused sudden loss of engine power and created a potential safety hazard because the vehicle could lose power unexpectedly in traffic and there was fluid leakage in the engine compartment near hot engine components. The problem was confirmed by a Nissan dealer. The dealer inspected the vehicle, documented the failed mounting area on the engine head, and submitted a goodwill warranty claim to Nissan, which was denied. Prior to the failure, there were no 18repairs or service in this area from the factory. Symptoms at the time of failure were loss of power and visible oil leakage from the top/right side of the engine. No warning lamps/messages prior to the mechanical failure. Vehicle had 60,845 miles at the time of failure.
My mechanic noticed oil leaking near the oil pressure switch during a routine oil change. Told me to take it to dealership since I should still be under warranty. When I took it in, they very quickly were able to access that the oil pressure switch was faulty. Mechanic said it is a known problem. If it is a known issue, why not recall it?!
This is my second complaint on this vehicle I have brought my car back multiple times for this issue and I keep getting they have found nothing wrong I feel very unsafe driving this car it stalls frequently while I’m driving I’ve been in the middle of very busy intersections I’ve been at stop lights it’s very humiliating when a a newer car stalls all the time. I’ve gone to the stores and come out and my car won’t start it’s very nerve racking and embarrassing having a 2023 vehicle and this is the stuff I have to deal with on a day to day basis wondering if I’m going to be able to go to work or any where or be stranded some where I bought the car brand new and it has not been reliable at all I’m to the point where I feel I need to seek legal advice on this matter. Since no one knows what the issue is. Very unhappy customer not a safe car at all stalling in the middle of intersections is pretty scary
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026