MACK

CBR 2491-1 082025

Manufacturer communications

Publication date: 2025-08-08
Received by NHTSA: 2025-09-02
NHTSA record numbers: 11022290

Manufacturer summary

Original wording in English

CBR - The purpose of this CBR is to provide instructions when fault code U300056: Electronic Control Unit, Invalid/Incompatible Configuration for the RCIOM is active.

NHTSA manufacturer communications ↗

Reported code forms

U3000

Manufacturer wording

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

MackU300056

Electronic Control Unit, Invalid/Incompatible Configuration for the RCIOM is active

NHTSA 11022290

Check 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
Mack	PIONEER PR (4)	2026
Mack	PIONEER PR (4)	2025

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