Nissan Altima 2018–2021 — technical service bulletin
Bulletin NTB21-009 · NHTSA communication 10186854 · issued Jan 28, 2021
Technical service bulletin
communication type
Fuel System, Gasoline
component
2018–2021
model years
9
vehicle entries
Official summary
DTC B12A3-72 FOR FUEL PUMP RELAY STUCK OPEN SERVICE INFORMATION DTC B12A3-72 (Fuel Pump Relay Stuck Open) may be stored when the IPDM monitor circuit internally sees 0V to ground at pin #46. This is caused by an internal short to ground in the IPDM or one of the IPDM fuses listed below is open. If B12A3-72 is current or reoccurs after erasing DTCs, inspect the model specific fuse first. If the fuse is not open replace the IPDM. ï · Altima â Fuse # 58 (page 2) ï · Kicks â Fuse # 54 (page 3) ï · Versa â Fuse # 61 (page 4) For additional IPDM diagnostic information refer to the Electronic Service
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.