Nissan Altima 2019–2021 — technical service bulletin
Bulletin NTB21-034 · NHTSA communication 10191951 · issued Apr 22, 2021
Technical service bulletin
communication type
Electrical System
component
2019–2021
model years
4
vehicle entries
Official summary
2019-2021 ALTIMA AND 2021 ROGUE; AC INOPERATIVE WITH DTC B20C8-14 STORED IF YOU CONFIRM The AC compressor is not engaging when the AC is in the ON position as indicated by the yellow illumination on the AC button, And DTC B20C8-14 ECV (ELECTRICAL CONTROL VALVE) is stored in the IPDM. SERVICE PROCEDURE 1. Clear the DTC, and follow the DTC CONFIRMATION PROCEDURE in the ESM. ï · If DTC B20C8-14 is past, AC compressor operation is inhibited until the DTC is cleared. ï · If DTC B20C8-14 returns after being cleared (either Current or Past status), follow the ESM diagnosis procedure. ï For models wit
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.