There are 5 owner-reported engine complaints for the 2018 Nissan Armadain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
UNKNOWN - engine developed knock that could potentially lead to catastrophic engine failure during normal driving conditions, causing loss of control or inability to stop. NTB19-057a is a technical service bulletin issued by manufacturer - cylinder 7 scuffing with a short block or complete engine replacement as the fix. Manufacturer will not replace engine outside of vehicle warranty period, even with documented maintenance proving engine failure is not due to lack of being maintained.
The contact owns a 2018 Nissan Armada. The contact stated while driving at an undisclosed speed, the vehicle lost motive power. There was no warning light illuminated. The vehicle was taken to the dealer but was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the NHSTA Hotline for assistance. The approximate failure mileage was 70,000.
Engine failure at 68,000 miles cylinder 7 scouring like previous years had this issue but my vehicle is affected as well.
VEHICLE TENDS TO LOSE POWER WHEN GAS PEDAL IS ENGAGED. WHEN FOOT IS OFF THE GAS AND BRAKES ARE APPLIED WHILE IDLED AT TRAFFIC LIGHT VEHICLE TRIES TO ACCELERATE. I CONSTANTLY HAVE TO BE MINDFUL TO KEEP BRAKES FIRMLY PRESSED.
CODE FOUND :P0138 (02), CODE FOUND :P0138 (PD) 02
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 May 4, 2026