P0840 on the 2008 Nissan Altima
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.
| NTB-09-148 | 2010-08-02. Service bulletin. NISSAN: MIL ON W/DTC P0840, P0845, P0744, P1777. REPLACE THE CONTROL VALVE ASSEMBLY WITH PART LISTED; REFERENCE SECTION TM, CONTROL VALVE REMOVAL AND INSPECTION IN APPROPRIATE ESM; ERASE EEP ROM CALIBRATION DATA IN TCM AND ALLOW IT TO RECALIBRATE. ALTIMA, ROGUE, SENTRA. *PE |
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| NTB:09-044 | 2009-07-31. Service bulletin. NISSAN: AFFECTED VEHICLES HAS CVT FLUID AND THAT IS DISCOLORED AND/OR HAS UNUSUAL ODOR. MIL IS ON WITH DTCS P0840 AND/OR P0845 STORED IN CONSULT III/ENGINE AND /OR TRANSMISSION. THE MIL IS ON AND P0710 IS STORED IN CONSULT III/ENGINE AND/OR TRANSMISSION. P0710 MAY BE STORED WITH P0840 AND/OR P0845. *PE |
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.