Keep competing causes visible.
Engine faults, exhaust leaks and identified sensor results remain evidence. A software reference does not cancel a physical finding.
Work through the diagnostic evidence →2025 DT · Hurricane HO EFC · built through 7 Jan 2025 · North America
2025 Ram 1500 Hurricane HO P0420
A converter quote needs more than a code. Compare the diagnostic findings with Ram’s ignition-control software reference for the exact HO engine and build date.
Ram 08-055-25 REV.A · 5 March 2025 ↗Conditional reference; actual application and software remain unverified
WHAT DO YOU NEED TO UNDERSTAND?
YOUR NEXT DECISION
Check the ignition-module record before deciding on a converter.
P0420 alone does not establish a failed converter. Related-system diagnosis and exact software applicability matter.
Keep the complete scan, existing test results and software record together.
Continue with this question →
Reading context only; no finding is added.
Does the exact Ram application fit?
Optional: compare an existing build or service record. The 3.0L badge does not confirm high-output EFC, DT or the build cutoff. Leave unknown details unknown; no VIN is entered or checked.
Application details remain unknown. This is background reading.
Take one useful question to the repair discussion
What findings and software record support the proposed repair?
Original source, revision limits and missing authority
The original two-page revision was read and visually checked; public source rechecked October 29, 2026. REV.A supersedes 08-055-25 of February 27, 2025 and identifies a revised repair summary and added markets. Current application, installed version and action status remain unknown.
Original factual commentary and links only. Manufacturer procedures and images are not republished. No license, restricted service information, actual-vehicle fitment or physical-repair approval is supplied. RSU involvement and warranty eligibility require separate confirmation.
Read the original Ram bulletin ↗