ISUZU

SB25-L-001A

2025-11-21 · NHTSA 11026137

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

Manufacturer summary

Original wording in English

SERVICE BULLETIN: THE ORIGINAL CALIBRATIONS IN THE ENGINE CONTROL MODULE (ECM) AND THE DIESEL EXHAUST FLUID CONTROL UNIT (DCU) OF CERTAIN 2025MY N-DIESEL VEHICLES CONTAINED INCORRECT LOGIC THAT MAY UNNECESSARILY CAUSE DIAGNOSTIC TROUBLE CODE (DTC) P2201 NOX SENSOR CIRCUIT PERFORMANCE SENSOR 1 TO SET AND ILLUMINATE THE MALFUNCTION INDICATOR LIGHT. THIS DTC MAY BE RESOLVED BY REPROGRAMMING BOTH ECM AND DCU WITH THE REVISED SERVICE CALIBRATIONS. FOLLOW THE DIAGNOSTIC FOR THIS DTC. IF NO MECHANICAL FAULT CAN BE FOUND DURING NORMAL DIAGNOSIS, FOLLOW THE SERVICE PROCEDURE IN THIS BULLETIN TO CORRECT THE CONCERN.

Repeated filings are grouped only when make, bulletin number, publication date and complete summary agree. Original record numbers are retained. Older publications remain available, and an explicit later version is shown when established. Pre-1994 vehicle associations are separated from default results; an unspecified year does not mean all model years apply.