BMW X5 2014–2017 — technical service bulletin
Bulletin B120817 · NHTSA communication 10149227 · issued May 1, 2017
Technical service bulletin
communication type
Engine
component
2014–2017
model years
4
vehicle entries
Official summary
POWERTRAIN FAULTS DUE TO CHAFING OF ENGINE WIRING HARNESS. One or more of the following fault codes are stored in the DDE: 29FB00 - DeNOx system, warning and switching off scenario: Warning level 1 280D00 - NOx-Sensor upstream DeNOx-catalytic converter, signal NOx: NOx-Signal invalid for too long 280F00 - NOx-Sensor downstream DeNOx-catalytic converter, signal NOx: NOx-signal invalid for too long 29FC00 - DeNOx-system, warning and switch-off scenario: Warning level 2 CD840A - FA-CAN bus: Control unit switched off from bus (Bus off) CD94C7 - Message (RQ_PWR_EL_EPS, 234.0.2, FX): Messaging from
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.