# Service bulletin CB23\-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: 10244947
- Published by NHTSA: 2023\-11\-06
- Manufacturer's number: CB23\-J\-003
- Manufacturer's date: 2023\-10\-27
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

CUSTOMER SATISFACTION CAMPAIGN: In some 2022\-2023 MY Isuzu F\-Series trucks equipped with RPO 5U5 Tire Size 255/70R22.5, a calibration error caused the affected vehicles to be built with an incorrect tire size value. As a result, the speedometer will show a vehicle speed higher than the actual vehicle speed while driving and the odometer will accumulate miles faster \(approximately 14% faster\) than the “actual” or “True” vehicle miles. Additionally, mileage data collected and stored in the Mimamori Unit \(MMU\) will be incorrect.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10244947-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10244947-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2022 to 2023 ISUZU F\-SERIES

JSON: [/v1/bulletins/10244947](/v1/bulletins/10244947)

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