What Does Subaru Error Code P26A3 Mean? [2026]
Subaru error code P26A3 means the vehicle’s computer has detected a range or performance issue with the engine coolant bypass valve, also known as the Thermo Control Valve. This component helps regulate engine temperature, warm-up time, and overall efficiency, and when it is not operating as expected, drivers may notice warning lights, poor heater performance, or reduced fuel economy.






