2015 Infiniti Q50: No power and cuts out
Common wear/failure (not a recall)
Symptoms
Owners of the 2015 Q50 report: no power and cuts out. CarComplaints.com lists 1 owner complaints, average mileage 44,600 miles.
NHTSA has 17 owner complaints for the 2015 Q50 in this area. Examples:
- 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 b…”
- NHTSA complaint ODI #11683201 (filed 08/26/2025): “The car just slowed down super fast on freeway almost got rear ended. it would not go past 3rd gear. poor acceleration. could have caused a huge accident. i got it diagnosed and they said it is valve body/speed sensor/tcm and they said this is a common proble…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: none clearly reported. Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Moderate
Finding and splicing chewed wiring is doable with a multimeter and patience but can be time-consuming; harness replacement is pro work. (Our assessment.)
Cost
CarComplaints.com owners report a typical repair cost of about $1,500 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .