There are 4 owner-reported powertrain & transmission complaints for the 2023 Land Rover Defenderin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The DC to DC converter Failed. It is part of the mild hybrid system. Multiple cars in my state and globally have reported the same failure around the same time. Supposedly these failures are due to the cold weather. At the 1st start up of the day a warning message displayed "Stop safely Electrical fault detected" the it disappeared after 1minute. After the 2nd start up the message reappeared and stayed on. I drove straight to the dealership where the vehicle would not be able to start or move again. My safety and others would have been at risk if the vehicle would have been immobile on the road. The vehicle has since had the DC to DC converter replaced as well as the battery which suffered power drain. These repairs were done by the manufacturer/dealership under warranty. The DC to DC converter was on back order for months due to so may vehicles suffering the same failure. With more cold weather ahead is the replacement part or system safe? I think this issue needs to be investigated.
On several occasions my car has shifted from Drive into Neutral while I was at a light and the vehicle had shut itself off as part of the Intelligent Start Stop feature. I see that this same issue has been happening to several other Owners who have reported this to the NHTSA. Ironically it seems as though all these vehicles were purchased in Houston TX.
Stopped on an uphill grade, start stop on vehicle activated, engine stopped. Upon brake release, engine started, vehicle made uncommanded shift from drive to neutral, rolled backward several feet before brake could be reapplied. Land Rover has been aware of the uncommanded shift to neutral issue for sometime. Local dealer has a bulletin on this issue, but Land Rover has no fix, instead advising to manually disengage auto start stop every time vehicle is driven. Unfortunately, sometimes I forget to do this. It’s a problem.
Vehicle makes uncommanded shifts from drive into neutral when the engine restarts after stopping during an auto start-stop cycle. Driver has to manually re-engage drive after this happens.
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