# Service bulletin CB22\-J\-003

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: 10228720
- Published by NHTSA: 2023\-01\-05
- Manufacturer's number: CB22\-J\-003
- Manufacturer's date: 2022\-12\-14
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Isuzu Motors Limited has determined that certain 2015 model year Isuzu N\-Series trucks equipped with 5.2L \(4HK1\) diesel engines were built with an Engine Control Module \(EC\) containing an On\-Board Diagnostic \(OBD\) calibration error for Diagnostic Trouble Code \(DTC\) P0401 Exhaust Gas Recirculation \(EGR\) Flow Insufficient. As a result, the ECM was not sensitive enough to detect DTC P0401 at the appropriate time, which would normally cause the check engine Malfunction Indicator Light \(MIL\) to illuminate. Isuzu has corrected the calibration so DTC P0401 can be detected properly.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10228720-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10228720-9999.pdf)

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

## Components

Engine

## Trouble codes named

P0401

## Vehicles listed

- 2015 ISUZU N\-SERIES

JSON: [/v1/bulletins/10228720](/v1/bulletins/10228720)

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