Subaru Outback warning lights activated and sluggish acceleration due to failed thermo control valve on Subaru Outback

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Subaru Outback owners report experiencing issues such as warning lights being activated alongside sluggish acceleration, which may be attributed to a failed thermo control valve. This failure can lead to coolant leaks that cause electronic shorts, triggering warning lights on the dashboard. Owners are advised not to operate the vehicle if red warning lights remain illuminated after starting, as this indicates malfunctions. Furthermore, a class action lawsuit has been filed alleging that certain Subaru models, including the Outback, have a defect in the thermo control valve that increases the risk of engine overheating. To avoid potential complications, it is recommended that affected owners have the thermo control valve inspected and repaired by a qualified technician.

1 person reported this problem
0 comments
Schedule Repair

Subaru Outback vehicles with this problem

0 model year affected

Search for another problem

RepairPal Car Genius

Ask our experts about your Subaru.

RepairPal Car Genius™ is a free resource for vehicle owners seeking advice on maintenance, auto repair, shop inquiries, estimates, and finding a trustworthy repair shop in your area.

 Auto Repair Expert Auto Repair Expert

Call us at 877-913-1554

Available 9am – 6pm ET Monday through Friday

Call Our Experts