# Service bulletin SB25\-L\-001

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11025201
- Published by NHTSA: 2025\-11\-07
- Manufacturer's number: SB25\-L\-001
- Manufacturer's date: 2025\-10\-08
- NHTSA component: FUEL/PROPULSION SYSTEM; ENGINE
- Manufacturer's system: ENGINE, FUEL, EXHAUST

## NHTSA's summary

SERVICE BULLETIN: THE ENGINE CONTROL MODULE AND THE DIESEL EXHAUST FLUID CONTROL UNIT OF CERTAIN 2025MY N\-DIESEL VEHICLES CONTAINED INCORRECT LOGIC THAT MAY UNNECESSARILY CAUSE 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 THE DCU WITH REVISED SERVICE CALIBRATIONS.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025201-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025201-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Fuel system

## Trouble codes named

P2201

## Vehicles listed

- 2025 ISUZU N\-SERIES

JSON: [/v1/bulletins/11025201](/v1/bulletins/11025201)

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