WenmarOpen by Wenmar Pro

Service bulletins for the 2021 Ram 1500

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.

1129 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
08-014-212021-02-16. Service bulletin. AIR BAGS; EXTERIOR LIGHTING; BACK OVER PREVENTION; ENGINE AND ENGINE COOLING. Motor Generator Unit (MGU) Connector Not Fully Seated This bulletin involves replacing the MGU. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following Diagnostic Trouble Codes (DTCs). U0594 - Implausible Data Received From HCP. P1B03-00 - Resolver Signal / MCPA Rationality. P0A3F-00 - Drive Motor A Position Sensor 1 Circuit. P0607-00 - ECU Internal Performance. P1C64-00 - Hybrid Perf - Engine Speed Below Target During Autostart. P0A92-00 - Hybrid Generator Performance. Customers may also experience the following: The vehicle has 15-40 minutes of driving time before a vehicle stall.The vehicle will be unable to re-start. The vehicle will lose charging of the main 12V battery. A check engine light and/or a low battery light illuminates.
S21250000012021-02-16. Service bulletin. ENGINE AND ENGINE COOLING. High Pressure (HP) Exhaust Gas Recirculation (EGR) Cooler, Perceived Internal Coolant Leak.
S21090000012021-02-16. Service bulletin. ENGINE AND ENGINE COOLING. Customer may complain of a MIL lamp on. Upon further investigation there could be a fault code in the PCM for P1524 ? Oil Pressure Out of Range ? Camshaft Advance/Retard Disabled.
90043452021-02-16. Service bulletin. ENGINE AND ENGINE COOLING. COOLER, EGR If you are replacing the high pressure EGR cooler (p/n 68490113A$) for a suspected internal coolant leak that was detected by wetness in the EGR pipe or valve, please perform proper cooling system pressure test first to verify the leak. Refer to all published service information regarding Cooling Diagnosis and Testing (LEAK TESTING) before proceeding.
S20080001832020-12-28. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. The Stop/Start (ESS) Off Switch Does Not Illuminate When Pressed
S1625000005 Rev.2020-12-28. Service bulletin. EQUIPMENT; FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. (Rev. A) Malfunction Indicator Light (MIL) Illuminated. Service Diesel Exhaust Fluid (DEF) System ? See Dealer Soon Message on Electronic Vehicle Information Center (EVIC) Along With Possible Diagnostic Trouble Code (DTC) P241D - SCR Inducement - Forced Engine Shutdown.
S20080001712020-12-28. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT:APPLIANCE:AIR CONDITIONER. HVAC Blower Motor Operates Intermittently Or Changes Speeds
S20080001862020-12-21. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Engine Control Module (ECM) Flash Failure, Diagnostic Trouble Code (DTC) U1601 ? ECU Application Software Code 1 Missing Or Corrupted
S20080001832020-12-21. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. The Stop/Start (ESS) Off Switch Does Not Illuminate When Pressed
S2008000126 Rev.2020-12-21. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; ENGINE. (Rev. B) RKE Has Reduced Range, Remote Start Inoperative, Multiple Keyless Go Push Attempts To Start
S1925000008 Rev.2020-12-21. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ENGINE; FUEL SYSTEM, DIESEL. (Rev. B) Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P20E8 ? Reductant Pressure Too Low and/or P208B ? Reductant Pump 1 Control Performance Set.
S1625000005 Rev.2020-12-21. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL; ELECTRICAL SYSTEM; FUEL SYSTEM, DIESEL. (Rev. A) Malfunction Indicator Light (MIL) Illuminated. Service Diesel Exhaust Fluid (DEF) System ? See Dealer Soon Message on Electronic Vehicle Information Center (EVIC) Along With Possible Diagnostic Trouble Code (DTC) P241D - SCR Inducement - Forced Engine Shutdown.
S20240000072020-11-30. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Customer Indicates There Is A Whistle Noise After The Vehicle Is Turned Off.
S1918000013 Rev.2020-11-30. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. No Crank No Start Condition. P0688 - Auto Shutdown Relay Sense Circuit Low Found In The PCM

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