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Service bulletins for the 2021 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.

1062 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
S25090000042025-04-03. Service bulletin. ENGINE. Misfire DTCs, Rough Idle, Valvetrain Noise
S2509000001 REV.A2025-04-01. Service bulletin. ENGINE. Engine Rattle Noise
1036182025-03-19. Service bulletin. ENGINE. HOSE - COOLANT RECOVERY BOTTLE
S25090000022025-03-07. Service bulletin. ENGINE. Engine Noise
91004582025-03-05. Service bulletin. ENGINE. "Engine Complete With scope to reduce cost per repair, Stellantis Engineering ask to use long block instead of engine complete replacement for GME T4 DOHC. Before to replace Long Block Engineering is asking to follow these checks for an overheating suspect diagnosis: 1) BLOC-CHECK-KIT (BLOCK TESTER or CO2 Tester) 2) CYLINDER LEAKAGE TEST 3) COOLING SYSTEM LEAKS -INTERNAL ENGINE LEAKAGE INSPECTION If no one of this checks (1-2-3) fails it does not need to replace long block ( even less full engine) but just the component causing the coolant leak."
9100498 REV 12025-03-05. Service bulletin. ENGINE. 3.6L PSU Long Block Misfire DTC codes and/or rough idle and/or valvetrain noise. These conditions may be related to worn intake camshaft high lift lobe(s), and intake rocker arm(s) high lift slider. High mileage failure (10,000-60,000 miles). 1. Remove the valve cover(s) per the released service procedures. The use of a stethoscope or DTC specific cylinder misfire codes can help to locate the condition to the left or right bank. 2. Once it has been visually confirmed that there is wear on the high lift intake lobe(s) & rocker arm(s) slider, there is a special service kit for this type of repair which should be used, instead of replacing the complete engine/long block. This kit contains the parts required for the repair (intake cam, rocker arms, sealer and gaskets). Once it is confirmed that the repair will be done using the camshaft/Rocker arms kit, it is also important to confirm that the vehicle being repaired has the latest calibration/software update for oil pump operation mode (high pressure mode) during engine start up. RU, VF, WL & WD vehicles already include the latest oil pump mode in all 25MY and beyond. 24MY service releases are also available. JL & JT were updated as a running change in 24MY and beyond (08/15/24 & 08/19/24 respectively). 24MY service releases available. DT was updated starting 25MY and beyond. If the vehicle to be repaired is a 24MY vehicle with a service release available, please follow the released service procedures to update to the corresponding calibration/software update.
S25090000012025-02-22. Service bulletin. ENGINE. Engine Rattle Noise
91004982025-02-12. Service bulletin. ENGINE. "3.6L PSU Long Block Misfire DTC codes and/or rough idle and/or valvetrain noise. These conditions may be related to worn intake camshaft high lift lobe(s), and intake rocker arm(s) high lift slider. High mileage failure (10,000-60,000 miles). 1. Remove the valve cover(s) per the released service procedures. The use of a stethoscope or DTC specific cylinder misfire codes can help to locate the condition to the left or right bank. 2. Once it has been visually confirmed that there is wear on the high lift intake lobe(s) & rocker arm(s) slider, there is a special service kit for this type of repair which should be used, instead of replacing the complete engine/long block. This kit contains the parts required for the repair (intake cam, rocker arms, sealer and gaskets)."
1029342025-02-05. Service bulletin. ENGINE. THROTTLE BODY
9100363 Rev12024-12-19. Service bulletin. ENGINE. Turbocharger Kit Please note many parts of the Turbo Assembly can be serviced separately and complete turbo replacement may not be necessary. If the Turbo is being replaced for a noise or a rattle, inspect the wastegate for binding. The actuator kit is serviced separately. If the turbo is being replaced for an oil leak concern, please inspect the area around the turbo oil feed oring for a leak. The o-ring is serviced separately
1011402024-10-18. Service bulletin. ENGINE. FCA Caribbean Warranty Bulletin ID-23-03 Rev. G 2018 - 2024 Jeep Wrangler (JL) and 2020 - 2024 (Current) Jeep Gladiator (JT) - Corrosion Warranty Claim Simplification
1011372024-10-18. Warranty extension. ENGINE. Warranty Bulletin D-23-04 Rev. F 2018 - 2024 Jeep Wrangler (JL) and 2020 - 2024 Jeep Gladiator (JT) - Corrosion Warranty Claim Simplification
1008762024-10-08. Warranty extension. STRUCTURE:BODY; ENGINE. FCA Caribbean Warranty Bulletin ID-23-03 Rev. F 2018 - 2024 (Current) Jeep Wrangler (JL) and 2020 - 2024 (Current) Jeep Gladiator (JT) - Corrosion Warranty Claim Simplification
1008752024-10-03. Warranty extension. ENGINE; STRUCTURE:BODY. Warranty Bulletin D-23--04 2018 - 2024 (Current) Jeep Wrangler (JL) and 2020 - 2024 (Current) Jeep Gladiator (JT) - Corrosion Warranty Claim Simplification
1001642024-09-03. Other. ENGINE. PUMP – WATER & CONNECTOR - OIL COOLER TUBE
S1408000384 REV.F2024-07-02. Service bulletin. ELECTRICAL SYSTEM; ENGINE. "Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On "
989332024-06-26. Other. ENGINE. PUMP – WATER & CONNECTOR - OIL COOLER TUBE
989312024-06-26. Other. ENGINE. PUMP – WATER & CONNECTOR - OIL COOLER TUBE
S2307000002 REV.B2024-06-11. Service bulletin. ENGINE. Suspected Engine Coolant Leak
S2307000002 REV.A2024-06-07. Service bulletin. ENGINE. Suspected Engine Coolant Leak
ZD8 Combo Rev32024-06-05. Service campaign. ENGINE. Customer Satisfaction Notification ZD8 Coolant Leak
9100338REV12024-06-04. Service bulletin. ENGINE. "GENERATOR Engine Prior to alternator/generator removal: 1. Inspect & check all electrical connections to the alternator a. 2-way connector containing field control circuit & alternator sense voltage circuit. b. Unplug & plug-in the 2-way connector for field & sense circuit. Verify the connection is tight & check for any bent pins in alternator connector or damage to female terminals in connector. c. Check Alternator B+ Stud connection to be sure nut is securing positive cable terminal properly (i.e. nut is clamping terminal & connection is tight). d. Check fuse between the alternator B+ stud & PDC terminal to make sure it is not blown. e. Be sure to follow service manual sections on ALTERNATOR CONTROL CIRCUIT DIAGNOSTIC & ALTERNATOR SENSE CIRCUIT DIAGNOSTIC looking for any opens & shorts (to ground or battery voltage). 2. Check/verify all grounds in the charging system circuit a. Check tightness of mounting bolts securing alternator to engine block. Alternator is a case ground component. b. Check main ground from engine to chassis; connection must be tight. c. Check battery ground cable connections are tight. d. Potentially, loosen alternator mounting bolts, without removing alternator, and re-tighten to torque specifications in service manual. e. After all steps above are complete, re-start engine & check charging system operation. 3. Verify that the Smart Charging System is not the reason for alternator low voltage & current output (Amps). a. Alternator charging can be suspended during engine idle operation because of the Smart Charge strategy. b. Refer to service manual section ""System Operation - Smart Charging System"". c. Refer to Star Case S2008000031 Rev A for low charging voltage & Smart Charge Mode Voltage Range diagram & mode descriptions. d. The alternator has no internal regulator; thus, has no smart circuitry. All alternator control signals come from ECM. 4. If alternator is faulty, remove alternator & mounting bolts. Return alternator with bolts for analysis at QEC."
91003372024-05-17. Service bulletin. ENGINE. "PUMP WATER For 2016-2024MY 3.6L Pentastar Upgrade with suspected coolant leak. PRIOR TO PERFORMING ANY WATER PUMP REPLACEMENT, PROCEED WITH INSPECTION INSTRUCTIONS FROM THE LATEST VERSION OF STAR ONLINE PUBLICATION S2307000002. Please submit pictures of the leak area thru the DIDI process outlined in the STAR Online document. NOTE: Some coolant residue may be found at the water pump weep hole plug area which may be normal, but coolant should not be dripping from this location. If unsure about, use the Pressurized Coolant System Inspection process as found in the Dealer Connect Cooling Diagnosis and Testing Procedures."
S23080001212024-01-16. Service bulletin. ENGINE AND ENGINE COOLING. Check Engine Lamp (CEL) On, Diagnostic Trouble Codes (DTCs) P0245, P2AB8
S23090000062024-01-08. Service bulletin. ENGINE AND ENGINE COOLING. Engine oil leak

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