Incomplete Regeneration
The HINO-P244B (Hino) diesel fault code means: Incomplete Regeneration. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
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What Are the Symptoms of HINO-P244B?
- Check Engine light
- DPR indicator light
- Reduced power
What Causes HINO-P244B? (Most Likely First)
- Regeneration failing or interrupted (burner, exhaust temperature, drive cycle) High
- Clogged DPR filter High
- Differential pressure sensor fault Medium
- Injector or burner-inlet temperature sensor fault Medium
Can I Still Drive with HINO-P244B?
Short distances only. HINO-P244B is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P244B mean on a Hino?
P244B means Incomplete Regeneration. The engine ECU integrates the soot the engine discharges and sets the code when the soot accumulation quantity has exceeded the allowable regeneration quantity, judged after automatic regeneration with the burner inactive, exhaust flow 205 L/s or more and the exhaust brake off.
Is P244B a Hino-specific code?
P244B is an SAE-format powertrain code, but the title and the conditions here are Hino's own, read from Hino's service documentation, not a generic definition.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose HINO-P244B?
Check the DPR filter and the differential pressure sensor.
Check for codes in the burner control unit and test burner systems 2 and 4 with the diagnostic tool.
Inspect the DPR indicator light and the accelerator switch circuit.
Check the injectors with the diagnostic tool.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- Hino Workshop Manual, HINO 238 / 258LP / 268 / 338 series with J08E-VB and J08E-VC engines, Engine Control System (J08E) chapter, DTC P244B "Incomplete Regeneration"technical description and detection conditions. Distributed through Hino's dealer service portal; no public link.
- SAE J2012Diagnostic Trouble Code Definitions (defines P244B as a generic OBD-II code)
P244B on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
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