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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

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
21-023-202020-05-26. 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.
21-017-202020-05-26. Service bulletin. POWER TRAIN; BACK OVER PREVENTION; 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.
S20250000022020-05-26. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. 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.
21-024-202020-05-18. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE; BACK OVER PREVENTION. 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.
21-022-202020-05-18. 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.
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.
18-012-202020-04-06. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one of the following Diagnostic Trouble Codes (DTCs) have been set:P0506 - Idle Speed Performance Lower Than Expected
18-013-202020-04-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one of the following Diagnostic Trouble Codes (DTCs) have been set:P0506 - Idle Speed Performance Lower Than Expected
90041012019-12-16. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:CLUTCH ASSEMBLY; EQUIPMENT. Clutch System Related Components For vehicles equipped with manual transmissions (sales code DEM) with a low mileage clutch failure please contact one of the following prior to repairs: Ganesh Maharajan: (248) 944-3018 or Cody Nofzinger: (248)-944-5847 If no response in 15 minutes, proceed with repair.
90041502019-12-02. Service bulletin. FUEL SYSTEM, GASOLINE; POWER TRAIN. SEAL, Input If looking to replace stubshaft due to ATX fluid leaking, do not replace PTU seals. None of the seals from the PTU side will need to be replaced whenever the ATX stubshaft is replaced, even though V-seal (68408748A$) is in direct contact with the stubshaft, it will not avoid grease/oil leakage from transmission side. PTU V-seals are intended to act as a dust cover for stubshaft - PTU input shaft spline interface. PTU Input shaft seal (68408749A$) is intended to hold PTU oil and debris ingress; it should be replaced only if the fluid leakage is confirmed to be PTU oil and not ATX trans. fluid.

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