2018 Subaru Outback: Dead battery
Common wear/failure (not a recall)
Symptoms
Owners of the 2018 Outback report: dead battery. CarComplaints.com lists 56 owner complaints, average mileage 25,900 miles.
NHTSA has 267 owner complaints for the 2018 Outback in this area. Examples:
- NHTSA complaint ODI #11768670 (filed 10/03/2026): “The touchscreen has delamination and ghost touching of the apps. i spoke with my dealer and was first told it was covered by subaru to replace, as it was a known issue, but when i took my car to the dealer, i was told i would have to pay around $1,500 to have…”
- NHTSA complaint ODI #11767919 (filed 09/29/2026): “The 8-inch gen 3 harman starlink touchscreen is delaminating/bubbling. it registers phantom touch inputs and becomes unresponsive on its own while the vehicle is in motion, changing audio, navigation, and system settings without driver input. if a phone is eve…”
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: replace battery (18 reports) charge battery (1 reports) failed "brake light switch." (1 reports) replace trunk (or boot) light switch (1 reports) replaced faulty dcm control module (1 reports). 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 $180 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .