# Service bulletin 18\-048\-26

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.

- Type: Service bulletin
- NHTSA id: 11031453
- Published by NHTSA: 2026\-04\-22
- Manufacturer's number: 18\-048\-26
- Manufacturer's date: 2026\-04\-17
- NHTSA component: POWER TRAIN; ENGINE

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0300 \- Multiple Cylinder Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0301 \- Cylinder 1 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0302 \- Cylinder 2 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0303 \- Cylinder 3 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0304 \- Cylinder 4 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0305\-00 \- Cylinder 5 Misfire \(Active or Stored status set during cold start catalyst heating\). ● P0306\-00 \- Cylinder 6 Misfire \(Active or Stored status set during cold start catalyst heating\). Customers may also comment on one or more of the following: ● The vehicle has a rough idle. ● The engine has a miss. ● Noisy valvetrain. This bulletin involves reprogramming the PCM with the latest available software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031453-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031453-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Transmission and driveline

## Trouble codes named

P0300, P0301, P0302, P0303, P0304, P0305, P0306

## Vehicles listed

- 2023 JEEP WRANGLER

## Recalls for the same vehicles and component

- [23V641000](/recalls/nhtsa/23V641000.md), 2023-09-18: POWER TRAIN:MANUAL TRANSMISSION
- [2023089](/recalls/tc/2023089.md), 2023-02-23: Powertrain
- [23V116000](/recalls/nhtsa/23V116000.md), 2023-02-23: POWER TRAIN:CLUTCH ASSEMBLY
- [2022672](/recalls/tc/2022672.md), 2022-11-23: Powertrain
- [22V865000](/recalls/nhtsa/22V865000.md), 2022-11-23: ENGINE

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [S2609000011](/bulletins/11037354.md), 2026-09-17, Service bulletin: ENGINE. MIL\-On and/or Engine Oil Leak
- [9100363 Rev 3](/bulletins/11036762.md), 2026-09-03, Service bulletin: ENGINE. Turbocharger Kit Please note that many turbo components are serviceable separately and full turbo replacement may not be required. If the turbo is being inspected for: Noise/Rattle: Inspect heat shield fasteners for looseness and check the wastegate actuator/linkage for binding. The actuator kit is serviced separately. Oil Leak: Inspect the turbo oil feed O\-ring area for leaks. O\-ring is serviced separately.
- [113271](/bulletins/11035078.md), 2026-07-18, Service bulletin: ENGINE. CORE – HEATER
- [113270](/bulletins/11035077.md), 2026-07-18, Service bulletin: ENGINE. CORE – HEATER
- [113153](/bulletins/11034915.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM; ENGINE. THERMOSTAT – NONE.
- [113152](/bulletins/11034914.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM; ENGINE. THERMOSTAT – NONE.
- [112639](/bulletins/11034912.md), 2026-07-08, Service bulletin: ENGINE. THROTTLE BODY – NONE
- [112640](/bulletins/11034911.md), 2026-07-08, Service bulletin: ENGINE. THROTTLE BODY – NONE
- [S2609000009](/bulletins/11034345.md), 2026-07-02, Service bulletin: ENGINE. Check Engine Light \(CEL\) Illuminated with Diagnostic Trouble Code \(DTC\) P0106 Manifold Absolute Pressure Sensor Performance Setting In The Powertrain Control Module \(PCM\)

JSON: [/v1/bulletins/11031453](/v1/bulletins/11031453)

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