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Service bulletins for the 2020 Ram 4500

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

569 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Engine control module are shown. Show all

Bulletins, newest first
S2008000186REVA2023-01-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ELECTRICAL SYSTEM. Engine Control Module (ECM) Flash Failure, Diagnostic Trouble Code (DTC) U1601 ? ECU Application Software Code 1 Missing Or Corrupted
S22080000732023-01-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). No Start, After Flash And Or PCM Replace, DTC P0513 Invalid Skim Key Setting
D19022022-10-17. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). Fast Feedback Program - 6.7L Cummins Engine - 2019 & 2020 HD Ram & 6.7L Cummins Diesel Engine Control Module (ECM) - 2018 Ram- All Models (Rev. E)
18-015-212022-08-22. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; BACK OVER PREVENTION; FUEL SYSTEM, DIESEL; SERVICE BRAKES, HYDRAULIC; FUEL SYSTEM, GASOLINE; EXTERIOR LIGHTING; ELECTRICAL SYSTEM; POWER TRAIN; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (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: P0607-00 - ECU Internal Performance. P20E8-00 - Reductant Pressure Too Low. P0301-00 - Cylinder 1 Misfire(Sym Cam Pump Only). P0302-00 - Cylinder 2 Misfire(Sym Cam Pump Only). P0303-00 - Cylinder 3 Misfire(Sym Cam Pump Only). P0304-00 - Cylinder 4 Misfire(Sym Cam Pump Only). P0305-00 - Cylinder 5 Misfire(Sym Cam Pump Only). P0306-00 - Cylinder 6 Misfire(Sym Cam Pump Only). P1C54-00 - SCR NOx Catalyst Missing. P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation(68RFE Only). P2463-00 - Diesel Particulate Filter Restriction - Soot Accumulation Bank 1(68RFE Only). P1451-00 - Diesel Particulate Filter System Performance(68RFE Only). P0299-00 - Turbocharger Underboost. P2706-00 - MS Solenoid Circuit (68RFE Only). P1D73-00 - AGS Performance. P061B - Internal Control Module Torque Calculation Performance. P064B-00 - PTO Control Module. The customer may also notice the following: Harsh downshift clunk during exhaust brake deceleration. DEF gauge erratic when DEF level is low. Stall when putting in reverse in cold ambient temps. Engine stumble during engine warm up. Unstable idle when AC compressor cycles. Power Take Off (PTO) intermittently turns off with no DTCs. In addition the following software enhancements are included: Engine oil pressure switch modification. Oil Change Monitor Improvements For Severe Duty Operation. System Improvement for PTO operation. wiTECH Mass Air Flow (MAF) data parameter improvement. Enabling wiTECH Particulate Matter (PM) Sensor Regeneration Test in PCM ?Misc Functions?. Active Grille Shutter (AGS) quality enhancements.
S20080001862020-12-28. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; ELECTRICAL SYSTEM. Engine Control Module (ECM) Flash Failure, Diagnostic Trouble Code (DTC) U1601 ? ECU Application Software Code 1 Missing Or Corrupted

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.