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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
91002122024-01-08. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. 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.
NotificationZD82024-01-02. Service bulletin. ENGINE AND ENGINE COOLING. Customer Satisfaction Notification ZD8 Coolant Leak
9003357A2024-01-02. Service bulletin. ENGINE AND ENGINE COOLING. ADAPTER, Engine Oil Filter (Pentastar V6) For all 2014MY replace the Oil Filter Adapter (OFA). For any other MY review and follow instructions from the latest STAR Online S1809000007 available on Dealer Connect. Also, consider the following: 1) Remove OFA 2) Replace only the oil inlet O-ring and gaskets (seals kit in SOL above). 3) Re-install the OFA. For 2023MY and beyond use black O-ring. For 2022MY and prior use red O-ring. Note: When replacing OFA, it may be necessary to transfer the Oil Temp/Pressure Sensor from the old OFA to the new OFA.
S23090000062023-10-30. Service bulletin. ENGINE AND ENGINE COOLING. Engine oil leak
S23080001172023-10-30. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Check Engine Light On, P0CA6-00 Hybrid/EV Battery Charging Current High
91002122023-10-30. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP. 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.
S23070000022023-10-02. Service bulletin. ENGINE AND ENGINE COOLING. Suspected engine coolant leak.
NotificationZD82023-10-02. Service bulletin. ENGINE AND ENGINE COOLING. The coolant inlet tube fasteners on about 90,811 of the above vehicles may become loose and allow a coolant weep that may propagate into a drip. Loss of coolant can cause the engine to overheat and, if not addressed, can lead to engine failure.
08178232023-09-25. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Power Inverter Module (PIM) Replacement Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following DTCs have been set: ? P0A78-00 - Drive Motor A Inverter Performance. ?P0A79-00 - Drive Motor B Inverter Performance. Customer may also experience the following: ? Internal Combustion Engine (ICE) propulsion only and no EV or hybrid mode only when these DTCs are present. This bulletin involves replacing the PIM.
S23250000062023-08-21. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Customer complaint may include a MIL-on or check engine lamp on condition.
S23090000022023-07-31. Service bulletin. ENGINE AND ENGINE COOLING. MIL lamp-on. Engine noise, rattle. Misfire or rough running.
S23230000212023-07-31. Service bulletin. ENGINE AND ENGINE COOLING. Clunk Noise From Front End Driving Between 15 And 35 MPH And When Decelerating. C0604- Active Air Dam Control Performance
S23090000012023-07-31. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. Upon turning the vehicle on, vehicle propulsion system is inoperative.
07007232023-07-31. Service bulletin. ENGINE AND ENGINE COOLING. Water Quality When Mixed With Engine Coolant
91001432023-07-31. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR. PSU right intake camshaft Case 1) If you are to flash the PSU (Pentastar Upgrade Engine) PCM due to P0300 code presence, only AB or previous LEVEL PSU right intake camshaft PN 05047913AA or AB (old version) should be replaced. If the engine is equipped with the AC/AD LEVEL PSU right intake camshaft PN 05047913AC or AD (new version), camshaft should NOT be replaced. Case 2) If the intake camshaft or intake rocker arm has excessive wear on the high lift profile (Rocker arm: slider, Camshaft: central lobe), replace the intake camshaft (1) in that cylinder head and all intake rocker arms (6).
18048232023-05-30. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. wiTECH Small Leak Verification Test (SLVT) - P0456-EVAP SYSTEM SMALL LEAK
NotificationZD82023-05-30. Service bulletin. ENGINE AND ENGINE COOLING. Customer Satisfaction Notification ZD8 Coolant Leak
NotificationZD82023-04-17. Service bulletin. ENGINE AND ENGINE COOLING. Customer Satisfaction Notification ZD8 Coolant Leak
9003357a2023-04-17. Service bulletin. ENGINE AND ENGINE COOLING. ADAPTER, Engine Oil Filter (Pentastar V6) For all 2014MY replace the Oil Filter Adapter (OFA). For any other MY review and follow instructions from the latest STAR Online S1809000007 available on Dealer Connect. Also, consider the following: 1) Remove OFA 2) Replace only the oil inlet O-ring and gaskets (seals kit in SOL above). 3) Re-install the OFA. For 2023MY and beyond use black O-ring. For 2022MY and prior use red O-ring. Note: When replacing OFA, it may be necessary to transfer the Oil Temp/Pressure Sensor from the old OFA to the new OFA.
90033572023-04-17. Service bulletin. ENGINE AND ENGINE COOLING. ADAPTER, Engine Oil Filter (Pentastar V6) For all 2014MY replace the Oil Filter Adapter (OFA). For any other MY (with mileage above 30,000) review and follow instructions from STAR Online S1809000007 REV. C available on Dealer Connect. Also, consider the following: 1) Remove OFA 2) Replace only the oil inlet O-ring and gaskets (seals kit in SOL above). 3) Re-install the OFA. For 2023MY and beyond use black O-ring. For 2022MY and prior use red O-ring. Note: When replacing OFA, it may be necessary to transfer the Oil Temp/Pressure Sensor from the old OFA to the new OFA.
91001342023-04-17. Service bulletin. ENGINE AND ENGINE COOLING. Engine When replacing a GMET4 long block from a 2021 JL or older, you will need to carry over the injector wiring harness from the original engine, and the Fuel pressure sensor should be replaced with part number: 68212572AB.
91001212023-02-13. Service bulletin. ENGINE AND ENGINE COOLING. Battery Heater If you are looking for the Electronic Coolant Heater (ECH) for DTC P0E15 please order the latest level part number 68443445A$.
91001162023-02-13. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING. Valve - Coolant JL PHEV Hoses to 3-Way valve coolant hoses misroute causes P0E80-00. Check hose routing as outlined in Star Online Publication S2208000205 or on a known good vehicle before replacing valve. Routing hoses correctly will likely fix the issue.
08111212023-01-17. Service bulletin. ENGINE AND ENGINE COOLING. 3.6L Check Engine Light and Rough Running Engine This bulletin involves cutting off a wiring harness eyelet and splicing in a pigtail to the engine ground harness. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P1050 - Intake Valve Control Solenoid 1 Circuit/Open. P1053 - Intake Valve Control Solenoid 2 Circuit/Open. P1056 - Intake Valve Control Solenoid 3 Circuit/Open. P1059 - Intake Valve Control Solenoid 4 Circuit/Open. P0010 - Bank 1 Camshaft 1 Position Actuator Circuit Open. P0020 - Bank 2 Camshaft 1 Position Actuator Circuit Open. P0013 - Bank 1 Camshaft 2 Position Actuator Circuit Open. P0023 - Bank 2 Camshaft 2 Position Actuator Circuit Open. In addition, the customer may notice one or more of the following conditions:The check engine light is illuminated. The engine is misfiring. A rough running engine.
S21090000042023-01-17. Service bulletin. ENGINE AND ENGINE COOLING. Issue involves overheating, running hot, coolant leaks and related symptoms after a Mopar replacement engine has been installed in the vehicle.

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