# Service campaign CB25\-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 campaign
- NHTSA id: 11026136
- Published by NHTSA: 2025\-12\-04
- Manufacturer's number: CB25\-L\-001
- Manufacturer's date: 2025\-11\-21
- Campaign id or software version: V2507
- NHTSA component: ENGINE
- Manufacturer's system: FUEL \& EXHAUST

## NHTSA's summary

CUSTOMER SATISFACTION CAMPAIGN: IN SOME 2025MY ISUZU N\-SERIES VEHICLES EQUIPPED WITH 5.2L \(4HK1\) DIESEL ENGINES, OPERATORS MAY EXPERIENCE AN ILLUMINATED CHECK ENGINE MALFUNCTION INDICATOR LAMP \(MIL\) WITH DIAGNOSTIC TROUBLE CODE \(DTC\) P2201 NOX SENSOR CIRCUIT PERFORMANCE SENSOR 1. WE HAVE DETERMINED A CALIBRATION ERROR IS CAUSING THIS DTC TO SET. THIS DTC MAY BE RESOLVED BY REPROGRAMMING THE ENGINE CONTROL MODULE \(ECM\) AND DEF CONTROL UNIT \(DCU\) WITH REVISED CALIBRATIONS.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11026136-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11026136-9999.pdf)

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

## Components

Engine

## Trouble codes named

P2201

## Vehicles listed

- 2025 ISUZU N\-SERIES

JSON: [/v1/bulletins/11026136](/v1/bulletins/11026136)

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