# Service bulletin CB23\-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: 10246226
- Published by NHTSA: 2023\-12\-05
- Manufacturer's number: CB23\-L\-001
- Manufacturer's date: 2023\-11\-03
- NHTSA component: FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY

## NHTSA's summary

IN SOME 2021MY ISUZU F\-SERIES VEHICLES, OPERATORS MAY EXPERIENCE AN ILLUMINATED CHECK ENGINE MALFUNCTION INDICATOR LAMP \(MIL\) WITH DIAGNOSTIC TROUBLE CODE \(DTC\) P2201 NOX SENSOR CIRCUIT PERFORMANCE SENSOR 1 AND/OR DTC P20EE DIESEL EXHAUST FLUID \(DEF\) SYSTEM NOX TRAP LOW EFFICIENCY SET IN THE DEF CONTROL UNIT \(DCU\). WE HAVE DETERMINED A DCU CALIBRATION ERROR IS CAUSING THIS DTC TO SET. THEREFORE, THIS DTC MAY BE RESOLVED BY REPROGRAMMING THE DCU WITH A REVISED CALIBRATION.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10246226-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10246226-9999.pdf)

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

## Components

Fuel system, Fuel tank

## Trouble codes named

P20EE, P2201

## Vehicles listed

- 2021 ISUZU F\-SERIES

JSON: [/v1/bulletins/10246226](/v1/bulletins/10246226)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20CB23-L-001&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10246226&vehicle=Service%20bulletin%20CB23-L-001)