2023 Hyundai Tucson: Car 12V system completely dead
Common wear/failure (not a recall)
Symptoms
Owners of the 2023 Tucson report: car 12V system completely dead. CarComplaints.com lists 1 owner complaints, average mileage 2,600 miles.
NHTSA has 37 owner complaints for the 2023 Tucson in this area. Examples:
- NHTSA complaint ODI #11755583 (filed 08/07/2026): “Under hyundai recall 290, the dealership permanently removed the functional trailer light wiring harness and replaced it with a nonfunctional rubber dust cap. a hyundai case manager informed me that a replacement harness is "in development," but official nhtsa…”
- NHTSA complaint ODI #11752416 (filed 07/23/2026): “The vehicle developed an intermittent but potentially dangerous engine control malfunction. after the engine reached normal operating temperature, the engine speed (rpm) would repeatedly surge while the vehicle was stopped in park and neutral, fluctuating from…”
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
No sourced cost range: get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .