The Complete Hino Fault Code List (2026 Update)

In the realm of automotive diagnostics, understanding and interpreting fault codes are crucial for maintaining the optimal performance of vehicles. When it comes to Hino trucks, having knowledge of Hino fault codes can streamline the troubleshooting process and reduce downtime. This blog will dive into a comprehensive Hino fault code list and help guide both novice and experienced technicians through how to resolve and prevent Hino fault codes.

Table of Contents

1. What are Hino Fault Codes?

2. The Complete Hino Fault Code List (PDF Download Available)

3. Hino Jaltest Troubleshooting Tutorials

4. Troubleshooting Techniques for Hino Fault Codes

5. Tips for Preventing Hino Fault Codes

What are Hino Fault Codes?

Hino fault codes are numerical or alphanumeric codes generated by the onboard diagnostic system to indicate issues within the vehicle's components or systems. These codes serve as valuable indicators that help pinpoint the root cause of a problem, guiding technicians in their diagnostic process. Understanding the structure and importance of Hino fault codes is essential for efficient troubleshooting and timely repairs.

The Complete Hino Fault Code List (2026 Update)

Hino Fault Code	Description / Common Causes
P0335	Main ICE rotation rate sensor or wiring fault
P0335	Main and auxiliary internal combustion engine rotation speed sensor fault
P0336	Invalid signal from main engine rotation sensor
P0606	Faulty ECU
P0629	Fuel pump control valve short circuit to power
P0200	ECU supply voltage above normal
P0200	ECU supply voltage below normal
P2120	Accelerator pedal position sensor malfunction
P0217	Engine overheating detected
P0088	Excess pressure in first stage of common rail
P0088	Excess pressure in second stage of common rail
P0088	Excess pressure in fuel line from supply pump
P0087	Fuel supply pump delivery problem
P0108	Combustion air pressure sensor signal above normal
P0117	Coolant temperature sensor signal below normal
P0118	Coolant temperature sensor signal above normal
P0191	Common rail pressure sensor mechanical problem
P0192	Common rail pressure sensor low signal
P0193	Common rail pressure sensor high signal
P0201	Injector cylinder 1 malfunction
P0202	Injector cylinder 2 malfunction
P0203	Injector cylinder 3 malfunction
P0204	Injector cylinder 4 malfunction
P0205	Injector cylinder 5 malfunction
P0206	Injector cylinder 6 malfunction
P0237	Combustion air pressure sensor signal below normal
P0605	ECU memory error
P0607	ECU internal malfunction
P0628	Fuel supply pump control valve malfunction
P1211	Injector 1 ground line short circuit
P1212	Injector 1 power line short circuit
P1214	Injector 2 ground line short circuit
P1215	Injector 2 power line short circuit
P1601	Injector data calibration error
P2228	Barometric pressure sensor low input signal
P2229	Barometric pressure sensor high input signal
P2635	Fuel pump suction control valve mechanical problem
P0182	Fuel temperature sensor low voltage
P0183	Fuel temperature sensor high voltage
P0340	Additional engine rotation speed sensor circuit malfunction
P0500	Vehicle speed sensor low input signal
P0501	Vehicle speed sensor high input signal
P0686	Main relay malfunction
P2121	Accelerator stuck open position
P2121	Accelerator stuck closed position
P2122	Accelerator sensor 1 low voltage
P2123	Accelerator sensor 1 high voltage
P2126	Accelerator sensor 2 stuck open
P2126	Accelerator sensor 2 stuck closed
P2127	Accelerator sensor 2 low voltage
P2128	Accelerator sensor 2 high voltage
P0540	Boost pressure sensor circuit low input
P0341	ECU flash ROM error
P0510	Accelerator switch malfunction
P0617	Starter switch malfunction
P0704	Clutch switch malfunction
P0850	Neutral switch malfunction
P1142	Idle control installation low voltage
P1143	Idle control installation high voltage
P1681	Retarder solenoid valve short circuit or open ground
P1682	Retarder solenoid valve short to power supply
U0155	Instrument cluster communication error
U1001	Chassis CAN data communication bus error
U0121	ABS module communication error
P1132	Accelerator sensor circuit low voltage
P1133	Accelerator sensor circuit high voltage

Click on the image to download the full list!

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Troubleshooting Techniques for Hino Fault Codes (2026 Update)

These advanced troubleshooting techniques can further enhance the diagnostic process for complex Hino fault codes:

• Waveform analysis: Waveform analysis involves using a digital oscilloscope to observe the electrical signals (voltage over time) coming from sensors, actuators, or communication lines in the vehicle. This identifies deeper issues such as weak signals, irregular timing, electrical noise, or intermittent faults.

• Data logging: Data logging records live engine and system data over time while the truck is running or being driven. To do this, you’ll need a diagnostic tool that captures parameters such as engine speed, fuel pressure, boost pressure, and sensor outputs over a period of time.

• Software updates: Software updates involve installing the latest programming or calibration files into the vehicle’s electronic control units (ECUs). Hino routinely releases updates to correct software bugs, improve system performance, and address known issues. Updating the software can resolve certain fault codes or drivability problems without replacing physical components.

Leveraging diagnostic software and advanced tools lets technicians dive deeper into the vehicle's systems, pinpoint confusing faults, and implement effective solutions. By staying ahead of technological advancements and honing their diagnostic skills, technicians can effectively tackle challenging fault codes and optimize repair outcomes.

Tips for Preventing Hino Fault Codes (2026 Update)

Preventive maintenance and proactive monitoring are key strategies for preventing Hino fault codes. These maintenance practices can help minimize system faults and improve overall vehicle reliability:

• Follow recommended service intervals: Perform routine maintenance such as oil changes, filter replacements, and system inspections according to manufacturer guidelines.

• Inspect critical components regularly: Check sensors, wiring, fuel systems, and emissions components to identify wear, damage, or loose connections before they lead to faults.

• Address minor issues early: Promptly repairing small problems can prevent them from escalating into more serious mechanical or electronic failures.

• Use diagnostic tools periodically: Running regular scans can help detect irregular system behavior before fault codes become active.

• Promote driver training and safe operation: Educating drivers on proper vehicle operation can reduce excessive strain on the engine, transmission, and emissions systems.

Conclusion

In conclusion, a comprehensive understanding of Hino fault codes is essential for maintaining the reliability, performance, and safety of Hino trucks. By familiarizing oneself with common fault codes, interpreting them accurately, and implementing effective diagnostic and repair procedures, technicians can troubleshoot issues efficiently and ensure optimal vehicle functionality. Proactive measures, advanced diagnostic techniques, and consistent maintenance practices play pivotal roles in preventing fault codes and preserving the operational integrity of Hino vehicles. By embracing a holistic approach to fault code management, technicians can elevate their service standards, enhance customer satisfaction, and uphold the reputation of the automotive industry.

Looking for more more information about how Jaltest can get your Hino equipment up and running in no time? Schedule a demo