RAM
18-021-26
Manufacturer communications
- Publication date
- 2026-02-14
- Received by NHTSA
- 2026-02-19
- NHTSA record numbers
- 11028882
Manufacturer summary
Original wording in English
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):
• P0300-00 - 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.**
• P2097 - Downstream Fuel Trim System 1 Rich.
• P2099 - Downstream Fuel Trim System 2 Rich. **Customers may comment on one or more of the following:
• Vehicle has a rough idle.
• Engine has a miss.
• Noisy valvetrain.**
• Lack power/responsiveness for the first couple of minutes or about 90 seconds after a cold start and later performs as expected. This bulletin involves reprogramming the PCM with the latest available software.
• 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.**
• P2097 - Downstream Fuel Trim System 1 Rich.
• P2099 - Downstream Fuel Trim System 2 Rich. **Customers may comment on one or more of the following:
• Vehicle has a rough idle.
• Engine has a miss.
• Noisy valvetrain.**
• Lack power/responsiveness for the first couple of minutes or about 90 seconds after a cold start and later performs as expected. This bulletin involves reprogramming the PCM with the latest available software.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Ram
P0300-00Multiple Cylinder Misfire - in Active or Stored status set during cold start catalyst heatingRam
P0301-00Cylinder 1 Misfire - in Active or Stored status set during cold start catalyst heatingRam
P0302-00Cylinder 2 Misfire - in Active or Stored status set during cold start catalyst heatingRam
P0303-00Cylinder 3 Misfire - in Active or Stored status set during cold start catalyst heatingRam
P0304-00Cylinder 4 Misfire - in Active or Stored status set during cold start catalyst heatingRam
P0305-00Cylinder 5 Misfire - in Active or Stored status set during cold start catalyst heatingRam
P0306-00Cylinder 6 Misfire - in Active or Stored status set during cold start catalyst heatingRam
P2097Downstream Fuel Trim System 1 RichRam
P2099Downstream Fuel Trim System 2 RichCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ram | 1500 | 2022 |