Filtering Performance (Missing Substrate)
The HINO-P244A (Hino) diesel fault code means: Filtering Performance (Missing Substrate). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
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What Are the Symptoms of HINO-P244A?
- Check Engine light
- Possible visible smoke
What Causes HINO-P244A? (Most Likely First)
- Cracked, eroded or missing DPR filter substrate High
- Differential pressure sensor pipe leaking or disconnected High
- Differential pressure sensor fault Medium
Can I Still Drive with HINO-P244A?
Short distances only. HINO-P244A is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P244A mean on a Hino?
P244A means Filtering Performance (Missing Substrate). The engine ECU tracks soot with the differential pressure sensor and DPR temperature sensor, and sets the code when it detects an abnormal drop in differential pressure across the DPR filter, checked after automatic regeneration with the burner inactive, exhaust flow 205 L/s or more and the exhaust brake off.
Is P244A a Hino-specific code?
P244A 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-P244A?
Inspect the differential pressure sensor pipes.
Inspect the DPR filter.
Inspect the burner-inlet exhaust gas temperature sensor.
Check EGR valve and VNT controller response 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 P244A "Filtering Performance (Missing Substrate)"technical description and detection conditions. Distributed through Hino's dealer service portal; no public link.
- SAE J2012Diagnostic Trouble Code Definitions (defines P244A as a generic OBD-II code)
P244A 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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