{"nhtsa_id":11028881,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-19","date":"2026-02-14","document_id":"18-020-26","mfr_campaign":null,"replaces":null,"component":"ENGINE; ELECTRICAL SYSTEM","mfr_system":null,"summary":"Flash: Powertrain Control Module (PCM) Updates **Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0300-00 - Multiple Cylinder Misfire - in Active or Stored status set during cold start catalyst heating. ● P0301-00 - Cylinder 1 Misfire - in Active or Stored status set during cold start catalyst heating. ● P0302-00 - Cylinder 2 Misfire - in Active or Stored status set during cold start catalyst heating. ● P0303-00 - Cylinder 3 Misfire - in Active or Stored status set during cold start catalyst heating. ● P0304-00 - Cylinder 4 Misfire - in Active or Stored status set during cold start catalyst heating. ● P0305-00 - Cylinder 5 Misfire - in Active or Stored status set during cold start catalyst heating. ● P0306-00 - Cylinder 6 Misfire - in Active or Stored status set during cold start catalyst heating.** ● P0335 - Crankshaft Position Sensor Circuit. ● P0339 - Crankshaft Position Sensor Intermittent. **Customers may comment on one or more of the following: ● Vehicle has a rough idle. ● Engine has a miss. ● Noisy valvetrain.** Other software enhancement included with this update: ● Idle stability improvements during Electronic Stability Control (ESC) events. , Claims Data and Special Tools sections, updated LOP number, Repair Procedure and new Repair Procedure notes. **REPAIR SUMMARY:","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028881-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028881-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028881","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null}],"codes":["P0300","P0301","P0302","P0303","P0304","P0305","P0306","P0335","P0339"],"topics":[],"vehicles":[{"make":"RAM","model":"1500","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_ram_1500"]}],"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":[]}