{"nhtsa_id":11031451,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-04-22","date":"2026-04-16","document_id":"18-046-26","mfr_campaign":null,"replaces":null,"component":"ENGINE; POWER TRAIN","mfr_system":null,"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).** ● P08A6 - Gear Lever Position Sensor System - Multiple Sensor Correlation. ● P152F - Engine Hood Switch 2 / Engine Hood Switch 1 Correlation. ● P1129 - Closed Loop Fueling Not Achieved - Bank 2 Upstream. ● P0152-02 - O2 Sensor 2/1 Circuit High. ● P0158-02 - O2 Sensor 2/2 Circuit High. ● P2504 - Charging System Output High. ● P0563 - Battery/System Voltage High. Customers may also comment on one or more of the following: ● **The vehicle has a rough idle. ● The engine has a miss. ● Noisy valvetrain. ● \"Service Transmission\" message in the Instrument Panel Cluster (IPC) due to clutch slip detection with the transfer case in neutral. NOTE: Some customers may experience wheel spin or traction loss. In these situations, the Powertrain Control Module (PCM) may interpret the event as excessive clutch slip. To prevent potential clutch damage, a message may be displayed in the Instrument Panel Cluster (IPC).** ● Clutch is overheating. ● Clutch is slipping on engagement. ● Inability to accelerate uphill. M18 FSAR-TSB-7162 -2- ● Vehicle does not start. ● Vehicle is stuck in limp-home mode","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11031451-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11031451-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11031451","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["P0152","P0158","P0300","P0301","P0302","P0303","P0304","P0305","P0306","P0563","P08A6","P1129","P152F","P2504"],"topics":[],"vehicles":[{"make":"JEEP","model":"WRANGLER","year_from":2023,"year_to":2023,"match":"exact","vehicle_ids":["2023_jeep_wrangler"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}