Fuel Rail Pressure Sensor Circuit Range/Performance
The HINO-P0191 (Hino) diesel fault code means: Fuel Rail Pressure Sensor Circuit Range/Performance. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
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What Are the Symptoms of HINO-P0191?
- Check Engine Light on
- Possible reduced power or rough running
- Possible hard starting
What Causes HINO-P0191? (Most Likely First)
- Sensor reading incorrectly High
- Wiring or connector fault Moderate
- A real fault in the system the sensor measures Moderate
- Shared sensor reference voltage problem Low
Can I Still Drive with HINO-P0191?
Short distances only. HINO-P0191 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P0191 mean on a Hino?
P0191 means Fuel Rail Pressure Sensor Circuit Range/Performance. The fuel rail pressure sensor is reporting, but its reading does not make sense against what the engine computer expects from other inputs.
Is P0191 a Hino-specific code?
No. P0191 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions Hino uses to set it on its diesels are in Hino service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose HINO-P0191?
Inspect the fuel rail pressure sensor connector and harness.
Compare the fuel rail pressure sensor reading with the other sensors and with operating conditions on a scan tool.
Check for other codes that share the same sensor reference voltage or ground.
Sources 3
This page is built from documented references. Verify against your own service info before repair work.
- Hino service bulletin SB-14-029 (filed with NHTSA)troubleshooting for DTC P2201 and P2214 on 2011-2015 Hino 238, 258, 268 and 338, showing these trucks report SAE diagnostic trouble codes
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
- SAE J2012Diagnostic Trouble Code Definitions (defines P0191 as a generic OBD-II code)
P0191 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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