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08-031-25 REV. B

Manufacturer communications

Publication date
2025-03-01
Received by NHTSA
2025-03-04
NHTSA record numbers
11014729

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 must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• **P0300-00 - Multiple Cylinder Misfire.
• P0301-00 - Cylinder 1 Misfire Detected.
• P0302-00 - Cylinder 2 Misfire Detected.
• P0303-00 - Cylinder 3 Misfire Detected.
• P0304-00 - Cylinder 4 Misfire Detected.
• P0305-00 - Cylinder 5 Misfire Detected.
• P0306-00 - Cylinder 6 Misfire Detected.
• P0420-00 - Catalyst System Efficiency Below Threshold Bank 1.
• P0430-00 - Catalyst System Efficiency Below Threshold Bank 2.**
• P2C30-00 - Ignition Coil Primary Circuit Fuse A.
• P2C31-00 - Ignition Coil Primary Circuit Fuse B. Customers may also comment on the following:
• Engine hesitates/misfires This bulletin involves inspecting and possibly reprogramming the ISCM and the Powertrain Control Module (PCM) with the latest available software."

NHTSA manufacturer communications ↗

Reported code forms

P0300P0301P0302P0303P0304P0305P0306P0420P0430P2C30P2C31

Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

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MakeModelModel year
Ram15002025

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