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Service bulletins for the 2020 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.

1228 on file from NHTSA, as of 2026-10-19.

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By component

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
S20080001132020-09-28. Service bulletin. ENGINE; ELECTRICAL SYSTEM. No Start Intermittently, Vehicle Requires Multiple Keyless Push To Start Attempts To Start Vehicle
S20080000992020-08-24. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Vehicle Cranks And Does Not Start, Multiple Low Voltage DTC?s Setting
S20230000312020-07-27. Service bulletin. ENGINE AND ENGINE COOLING. Whistle Noise Inside Cab With Window Slightly Lowered
S20250000052020-07-27. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE). Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes P0407 ? EGR Sensor B Circuit Low, or P0408 ? EGR Sensor B Circuit High Set
08-056-202020-06-22. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; ENGINE. Flash: Battery Pack Control Module (BPCM) Updates This bulletin involves reprogramming the BPCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find thefollowing DTCs have been set:If these codes re-occur after the software update then follow published service information.P0A82-00 - Hybrid/EV Cooling Fan 1 Performance/Stuck Off. P0A97-00 - Hybrid/EV Cooling Fan 2 Performance/Stuck Off. P0AC0-00 - Hybrid Battery Pack Current Sensor 1 Circuit Performance(2019MY Only). P1AEC - MCPA HV Battery Voltage Sensor Circuit Performance(2019 MY Only). If DTCs, P0AA1-00 - Hybrid Battery Positive Contactor Circuit Stuck Closedand P0AC0-00 - Hybrid Battery Pack Current Sensor 1 Circuit Performance is set together, follow the published service diagnostic informationfor P0AA1-00 before proceeding further with this bulletin(2019 MY Only).If DTC, P0AC0-00 is set without P0AA1-00, proceed with the bulletin(2019 MY Only).
09-008-202020-06-22. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; ENGINE. Inspect Hydraulic Belt Tensioner This bulletin involves inspecting the Julian date on the hydraulic belt tensioner for possible replacement. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the following Diagnostic Trouble Codes (DTCs) have been set:P2BA3-00 - Starter/Generator Mechanical Performance. P0A92-00 -Hybrid Generator Performance. Customers may also experience the following:Dead battery. The accessory drive belt may be slipping or belt noise.
W212020-06-22. Service bulletin. EQUIPMENT; ENGINE. Customer Satisfaction Notification U21 Serpentine Belt Tensioner
S19090000022020-06-22. Service bulletin. EQUIPMENT; ENGINE. Customer complaint may include an overfilled engine crankcase after an oil change.
S20090000022020-06-22. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:ENGINE:DIESEL; FUEL SYSTEM, DIESEL. Oil Leak From The Front Timing Gear Housing Gasket. (Note: ETL, ETK, ETM, ETN Diesel Engines)
S19250000082020-06-22. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:ENGINE:DIESEL; EQUIPMENT. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P20E8 ? Reductant Pressure Too Low and/or P208B ? Reductant Pump 1 Control Performance Set.
90042572020-06-22. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. FILTER KIT, Engine Oil When refilling oil on a JT, JL, DT, or RU equipped with a 3.6L Pentastar UPGRADE engine, please be advised that the engine oil capacity is 5 quarts of oil.
08-033-202020-05-26. Service bulletin. ENGINE AND ENGINE COOLING. Intermittent No Crank No Start This bulletin involves inspecting the ground wire to engine block fastener and replacingif necessary. The customer may comment on the following:A no start and/or intermittent no start condition.
08-028-202020-05-26. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Flash: Hybrid Control Processor (HCP) Updates This bulletin involves updating the HCP with the latest available software. Customers may experience the following:Bump or shutter felt during engine start/stop (ESS) situation. The following enhancement is also included in this software update:Improvements to engine start stop quality to eliminate bumps or shutter. Improvements to motor rotor temperature model for robustness.
D-19-20 Rev. B2020-05-26. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. Fast Feedback Program - 3.0L Diesel Engine and Components - 2020 Ram 1500 (DT) and 2020 Jeep Wrangler (JL) - All Models (Rev. B)
S20180000012020-05-26. Service bulletin. ENGINE AND ENGINE COOLING. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P26FB ? EGR Cooler Bypass Control Stuck Closed Bank 1 Set.
08-028-202020-05-18. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Flash: Hybrid Control Processor (HCP) Updates This bulletin involves updating the HCP with the latest available software. Customers may experience the following:Bump or shutter felt during engine start/stop (ESS) situation. The following enhancement is also included in this software update:Improvements to engine start stop quality to eliminate bumps or shutter. Improvements to motor rotor temperature model for robustness.
18-020-202020-05-18. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customer may experience one or more of the following:Hesitation upon Engine Stop Start (ESS) autostart. Hesitation upon light acceleration below 20 MPH. Hesitation when accelerating while warming up, with coolant temperature below 60 ºC (140 ºF).
D-19-20 Rev. B2020-05-18. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. Fast Feedback Program - 3.0L Diesel Engine and Components - 2020 Ram 1500 (DT) and 2020 Jeep Wrangler (JL) - All Models (Rev. B)
S20180000012020-05-18. Service bulletin. ENGINE AND ENGINE COOLING. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Code (DTC) P26FB ? EGR Cooler Bypass Control Stuck Closed Bank 1 Set.
09-005-202020-04-27. Service bulletin. ENGINE AND ENGINE COOLING. 3.0L Oil Filter Cartridge Identification Differences And Oil Filter Element Servicing Procedure This bulletin outlines the correct procedure for changing an oil filter on a 3.0L diesel to prevent engine damage. The bulletin also highlights the design differences in the oil filter cartridges used in the GEN-2 and GEN-3 3.0L diesel. As well as potential issues that can arise should the incorrect filter be used in each application.
08-033-202020-04-27. Service bulletin. ENGINE. Intermittent No Crank No Start This bulletin involves inspecting the ground wire to engine block fastener and replacingif necessary. The customer may comment on the following:A no start and/or intermittent no start condition.
08-028-202020-04-27. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Flash: Hybrid Control Processor (HCP) Updates This bulletin involves updating the HCP with the latest available software. Customers may experience the following:Bump or shutter felt during engine start/stop (ESS) situation. The following enhancement is also included in this software update:Improvements to engine start stop quality to eliminate bumps or shutter. Improvements to motor rotor temperature model for robustness.
W142020-04-27. Service bulletin. ENGINE. Customer Satisfaction Notification W14 Ground Bolt
D-19-20 Rev. A2020-01-21. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. Fast Feedback Program - 3.0L Diesel Engine and Components - 2020 Ram 1500 (DT) and 2020 Jeep Wrangler (JL) - All Models (Rev. A)
18-089-192019-12-16. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE. wiTECH Small Leak Verification Test (SLVT) - P0456-EVAP SYSTEM SMALL LEAK

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