P0128 on the 2013 Subaru Forester
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 095613 | 2023-05-08. Service bulletin. Countermeasure Thermostat Availability for DTC P0128 |
|---|---|
| 09-56-13 | 2017-03-01. Service bulletin. "A COUNTERMEASURE THERMOSTAT HAS BEEN RELEASED TO ADDRESS A RARE CONDITION WHICH MAY OCCUR DURING ENGINE SOAK IN COLD AMBIENT TEMPERATURES. IN THESE RARE CASES, AFTER AN EXTENDED COLD SOAK, COOLANT MAY ENTER THE THERMOSTAT’S INTERNAL PISTON. IF THIS OCCURS, THE THERMOSTAT MAY OPEN AT A TEMPERATURE WHICH IS LOWER THAN SPECIFIED AND CAUSE DTC P0128 TO BE STORED IN THE ECM MEMORY." |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.