# Service bulletin SB\-14\-012

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: 10185594
- Published by NHTSA: 2021\-01\-19
- Manufacturer's number: SB\-14\-012
- Manufacturer's date: 2014\-07\-15
- NHTSA component: POWER TRAIN; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE

## NHTSA's summary

A subject vehicle may exhibit an illuminated check engine lamp with DTC \(Diagnostic Trouble Code\) P0421 \(Catalyst efficiency below threshold\). The engine ECU may falsely detect an issue with the ATC \(After Turbo Catalyst\) with the current ECU software. If DTC P0421 is stored in the engine ECU, reprogram the ECU to the latest software level prior to suspecting a fault with the ATC.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2014/MC-10185594-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2014/MC-10185594-9999.pdf)

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

## Components

Engine, Transmission and driveline, Engine control module

## Trouble codes named

P0421

## Vehicles listed

- 2015 HINO CONVENTIONAL MODELS
- 2015 HINO NE8J
- 2015 HINO NJ8J
- 2015 HINO NV8J

JSON: [/v1/bulletins/10185594](/v1/bulletins/10185594)

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