RAM
08-087-25
Manufacturer communications
- Publication date
- 2025-03-27
- Received by NHTSA
- 2025-04-02
- NHTSA record numbers
- 11016290
Manufacturer summary
Original wording in English
"Flash: Ignition System Control Module (ISCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle mustexhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P0305-00 - Cylinder 5 Misfire.
• P0306-00 - Cylinder 6 Misfire.
• P0420-00 - Catalyst System Efficiency Below Threshold Bank 1.
• P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following:
• Engine misfires.
• Damage to catalyst. This bulletin involves inspecting and possibly reprogramming the ISCM and the Powertrain Control Module (PCM) with the latest available software."
• P0305-00 - Cylinder 5 Misfire.
• P0306-00 - Cylinder 6 Misfire.
• P0420-00 - Catalyst System Efficiency Below Threshold Bank 1.
• P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following:
• Engine misfires.
• Damage to catalyst. This bulletin involves inspecting and possibly reprogramming the ISCM and the Powertrain Control Module (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
P0305-00Cylinder 5 MisfireRam
P0306-00Cylinder 6 MisfireRam
P0420-00Catalyst System Efficiency Below Threshold Bank 1Ram
P0430-00Catalyst System Efficiency Below Threshold Bank 2Check 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 | 2025 |