2023 Nissan Altima: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 6 owner complaints for the 2023 Nissan Altima that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11747812 (filed 07/01/2026): “I was driving down the freeway at about 70 miles an hour. when a warning came up, saying engine malfunction power reduced, the car then started the shaking a bit and not getting any power. smoke started pouring out of the hood. i then pulled over open the hood. it was then on fire(small).i put it ou…”
- NHTSA complaint ODI #11730481 (filed 04/10/2026): “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 potenti…”
- NHTSA complaint ODI #11713813 (filed 01/28/2026): “Attempted to start 2023 nissan altima. engine did not turn over. dashboard lights came on and then shut off. no further response. had altima towed to nissan dealer and after two weeks of sitting at the dealership. we were informed that the bcm unit needed to be replaced and fobs reprogrammed. cause …”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
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