P0406 on the 2012 Jeep Grand Cherokee
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.
| 08-008-15 | 2018-11-19. Service bulletin. Flash: DTC P0405 / P0406 - MIL Light On This bulletin involves reprogramming the Engine Control Module (ECM) with new software. A small number of customers may report the MIL light is on. On further inspection Diagnostic Trouble Code (DTC), P0405 - EGR POSITION SENSOR CIRCUIT LOW and/or P0406 - EGR POSITION SENSOR CIRCUIT HIGH may be found. |
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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.