RAM 1500 2019–2021 — technical service bulletin
Bulletin S2008000186 · NHTSA communication 10184426 · issued Nov 20, 2020
Technical service bulletin
communication type
Engine
component
2019–2021
model years
11
vehicle entries
Official summary
Engine Control Module (ECM) Flash Failure, Diagnostic Trouble Code (DTC) U1601 ? ECU Application Software Code 1 Missing Or Corrupted
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.