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Service bulletins for the 2020 Jeep Wrangler

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.

1020 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
21-022-202020-05-18. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION; POWER TRAIN. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
21-023-202020-05-18. Service bulletin. BACK OVER PREVENTION; ELECTRICAL SYSTEM; POWER TRAIN. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
21-017-202020-05-18. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
V882020-05-18. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Customer Satisfaction Notification V88 Rear Quarter Windows
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)
S19080002082020-05-18. Service bulletin. EQUIPMENT. Satellite Radio Inoperative Radio Has Code B156B-13.
S20240000022020-05-18. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. WiTECH HVAC Actuator Calibration Test Reserved Tab.
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.
S18190000042020-05-18. Service bulletin. STRUCTURE. Shimmy Felt In Front End
S202300000172020-05-18. Service bulletin. VISIBILITY. Whistle Wind Noise From Windshield Area.
S20250000012020-05-18. Service bulletin. ELECTRICAL SYSTEM. Malfunction Indicator Lamp Illumination (MIL). Diagnostic Trouble Code (DTC) P203E ? Reductant Level Sensor 1 Circuit Intermittent-Erratic Set.
S20250000022020-05-18. Service bulletin. ELECTRICAL SYSTEM. Customer complaint includes check engine/MIL light on. Upon further inspection, fault codes will be found in the powertrain control module (PCM) for P0441, P0443 or P0449. Fault codes may be either active or stored.
S20030000012020-05-18. Service bulletin. SUSPENSION. Noise From Front Axle Area Over Bumps
S20180000022020-05-18. Service bulletin. FUEL SYSTEM, GASOLINE. Malfunction Indicator Lamp (MIL) Illuminated. Fuel Injection Quantity Diagnostic Trouble Codes (DTCs) Set.
90042192020-05-18. Service bulletin. EQUIPMENT. PUMP, Water (Water Pump Inlet Tube) For concern of leak at water pump, please check and re-torque water pump inlet tube fasteners as described in Service Bulletin 07-001-20 before replacing the water pump.
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.
07-001-202020-04-27. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. Water Pump Inlet Tube Fastener Torque This bulletin involves checking the torque on the water pump inlet tube fasteners to possibly eliminate coolant leak at this location. The customer may describe either a coolant leak or the coolant level is low.
21-024-202020-04-27. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
21-022-202020-04-27. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
21-023-202020-04-27. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
21-017-202020-04-27. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a loud whistle noise upon engine start up.
V882020-04-27. Service bulletin. VISIBILITY. Customer Satisfaction Notification V88 Rear Quarter Windows
D-19-20 Rev. B2020-04-27. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, DIESEL. Fast Feedback Program - 3.0L Diesel Engine and Components - 2020 Ram 1500 (DT) and 2020 Jeep Wrangler (JL) - All Models (Rev. B)
S19080002082020-04-27. Service bulletin. EQUIPMENT:ELECTRICAL. Satellite Radio Inoperative Radio Has Code B156B-13.
S20240000022020-04-27. Service bulletin. EQUIPMENT:ELECTRICAL. WiTECH HVAC Actuator Calibration Test Reserved Tab.

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