P1840 on the 2012 Subaru B9 Tribeca
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.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| 16-80-11R | 2016-05-23. Service bulletin. IF YOU ENCOUNTER A VEHICLE THAT HAS THE OIL TEMPERATURE WARNING LAMP FLASHING WITH P0751, P0756, P0761, P0766, P0771, P1840, P1841, P1842, P1843 OR P1844 STORED IN MEMORY AND POSSIBLY AN INTERMITTENT STALLING CONDITION, IT MAY BE THE RESULT OF CONTAMINATION IN THE VALVE BODY. INSTEAD OF REPLACING THE VALVE BODY, FLUSH THE TRANSMISSION AND PERFORM THE DYNAMIC CHECK MODE PROCEDURE. |
|---|
1 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.