2015 Infiniti Q50: Power Train complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 41 owner complaints for the 2015 Infiniti Q50 that list the power train component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11756528 (filed 08/12/2026): “While operating the vehicle, the transmission suffered an abrupt failure resulting in diagnostic trouble code (dtc) p0720 (output speed sensor circuit). further diagnostic inspection revealed a complete internal failure of the integrated valve body assembly, which houses the transmission control mo…”
- NHTSA complaint ODI #11750490 (filed 07/15/2026): “While driving my 2015 infiniti q50s, the transmission suddenly suffered a catastrophic electronic failure, causing the vehicle to immediately drop into "limp mode." this resulted in a sudden and dangerous loss of acceleration while operating in traffic. a diagnostic scan revealed trouble codes p050…”
- NHTSA complaint ODI #11737881 (filed 05/14/2026): “The valve body on these cars are useless. driving down a highway and cant shift out of 3rd gear almost had a car re-end me. today i am driving and the ecu is not responding i see the check engine light on then i'm like not again. this would be the 3rd valve body i replaced. first i replaced the who…”
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
Diagnosis needs a scan tool; repair or replacement needs a lift, transmission jack and the manufacturer's fluid fill/relearn procedure. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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Sources
Page last updated .