RAM 2500 2020 — technical service bulletin
Bulletin 18-012-21 · NHTSA communication 10188806 · issued Feb 5, 2021
Technical service bulletin
communication type
Service Brakes, Hydraulic
component
2020
model years
2
vehicle entries
Official summary
Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set. The customer may also notice one or more of the following:Harsh downshift clunk during exhaust brake decel
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.