"Flash: Ignition System Control Module (ISCM) Updates Customers must experience a Malfunction Indicator...
Ram technical service bulletin 08-087-25 for 2025 Ram 1500.
- Bulletin number
- 08-087-25
- Component
- Electrical system
- Summary
- "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."
Owners of these vehicles have filed 199 complaints in the electrical category.
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