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Service bulletins for the 2018 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.

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

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By component

By trouble code

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

Bulletins, newest first
18-092-192019-12-16. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technicianmay find one or more of the following Diagnostic Trouble Codes (DTCs):P06EF - Engine Restart Performance. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT)to determine if a leak is present in the system. Customers may experience one or more of the following:Excessive blower fan noise when the A/C is on MAX output. Intermittentrough idle or idle surging, when coming to a stop(Automatic transmission equipped vehicles only). Random Electronic Stability Control (ESC) lamp illuminates in the InstrumentPanel Cluster (IPC). Driving at vehicle speeds while in first gear and shifting into neutral, amessage "Shift to 1st gear not allowed" message appears in the Electronic Vehicle Information Center (EVIC) when conditions are not met(Manual transmission equipped vehicles only). 3 km (2 mph) difference between cruise set speed versus actual displayspeed. During cold vehicle operation and the use of cruise control on vehicles equipped with an automatic transmission, the engine RPMs may dropbelow idle speed while cruise control is engaged, this may occur if the customer presses the accelerator pedal to achieve a vehicle speedgreater than the cruise control speed and then releasing it. Radio or IPC may reboot (flash off/flash on) during an Engine Stop Start(ESS) shutdown in cold conditions with a battery temperature below -12°C (10°F).
18-006-19 REV B2019-07-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). 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 that the following DTCs have been set:P249E-00 - Closed Loop Reductant Injection Control At Limit - Flow Too High. P045E-00 - EGR -B- Control Stuck Open. P208B - Reductant Pump 1 Control Performance. In addition customers may experience the following:Engine auto-stops during a shift of transfer case into neutral. Reduced oil change intervals. Speed Limiter distance unit type changes from MPH to KPH after key-off. Speed Limiter not enabled following a quick key-off/on sequence. Cruise control set-speed not displayed by cluster until minimum set speed achieved. Increased fan noise. Reduced durability of electric vacuum pumps under heavy stop/go driving conditions. Driveability complaints during an on-road DPF regeneration routine. Previous software releases requested the display of message "Particulate Filter Almost Full Keep The Vehicle Running" and will now request the message "Particulate Filter 100% Full Maintenance Required Contact Assistance". No auto-start after release of brake pedal.
18-041-192019-07-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with thelatest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or moreof the following DTCs have been set: P0456 - EVAP System Small Leak(APAC&EMEA with Sales Codes NA1 with NBQ or NB6 Only). P0128 - Thermostat Rationality(APAC&EMEA with Sales Codes NA1 with NBQ or NB6 Only). P050B - Cold Start Ignition Timing Performance(APAC&EMEA with Sales Codes NA1 with NBQ or NB6 Only). Customers may experience: Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. Software enhancements include:Electric vacuum pump (EVP) update. Fan noise reduction. Low speed pre ignition (LSPI) update.
90040712019-07-15. Service bulletin. POWER TRAIN. SWITCH, Neutral Safety If you are working on a Manual Transmission and are considering replacing the Neutral Safety Switch for an Auto Start/Stop Issue, Prior to order/replace please first check operation of the SENSOR; Clutch Pedal and SWITCH, Clutch Starter Interlock. If you have any question, contact Jeff Laduke at (810) 422-3099. If no response in 15 minutes, proceed with repair.
90040852019-07-15. Service bulletin. POWER TRAIN:CLUTCH ASSEMBLY:PEDAL/HAND LEVER(MOTORCYCLE). SENSOR, Clutch Pedal Engineering is seeking information regarding P083F - Clutch Pedal Sensor A B Correlation Faults. Prior to component(s) replacement: Please Contact the following individuals: Joe Marigold (248) 701-8510 / joe.marigold@fcagroup.com Michael Lai (734) 286-0321 / michael.lai@fcagroup.com If no response in 15 minutes, proceed with repair

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