MAP Sensor Circuit Malfunction
The HINO-P0105 (Hino) diesel fault code means: MAP Sensor Circuit Malfunction. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
- Estimated cost
- $250-$3,000
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Common Symptoms
- Loss of power / sluggish throttle response
- Black smoke, especially during acceleration
- Poor fuel economy
- Whistling or chirping from turbo
- Check Engine Light with soft derate
Probable Causes (Ranked by Likelihood)
- Swirl / intake flap valves clogged with soot (classic J08 issue) Very Likely
- VGT / VNT actuator sticking from carbon build-up Likely
- Charge-air cooler or intake boot leak Possible
- MAF contamination — replace only after cleaning test Possible
- EGR flow bleed-back loading intake with soot Possible
Frequently Asked Questions
What does Hino code P0105 mean?
Hino diagnostic trouble code P0105 (MAP Sensor Circuit Malfunction) is a moderate-severity fault on Hino medium-duty diesel engines. It indicates a problem in the air / boost system that should be verified with a scan tool (Hino DX3 / DX4) before replacing any parts.
Can I drive my Hino truck with P0105?
Short runs may be possible but do not ignore — Hino medium-duty aftertreatment faults cascade quickly into 5-mph derate or no-restart. Schedule diagnosis immediately.
How much does it cost to fix Hino P0105?
Estimated repair cost runs $250-$3,000. Sensor, wiring, and DEF-related repairs fall at the low end; DPF service, turbo, injector, and EGR cooler work fall at the high end and may require dealer-level programming.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
Verify P0105 on Hino DX3. Graph MAF / MAP / commanded boost vs actual boost at part and full throttle.
Inspect the intake manifold swirl / tumble flap mechanism — J08 swirl valves carbon up and stick; removal and cleaning resolves many lingering performance faults.
Pressure-test the intake with smoke from CAC to throttle — look for leaks at clamps, cracked resonators, and cracked CAC end tanks.
Apply vacuum / electrical actuation to the VGT actuator and confirm full vane travel.
Clean MAF with CRC MAF cleaner before replacing; replace only if cleaning does not restore readings.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
- SAE J2012Diagnostic Trouble Code Definitions (defines P0105 as a generic OBD-II code)
P0105 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Commonly Affected Vehicles
- Hino 155 / 155h with J05 5.1L
- Hino 195 / 195h (hybrid) with J05D 5.1L
- Hino 258 / 258LP / 268 with J08 7.7L
- Hino 338 / 338CT with J08 7.7L
- Hino 358 / 358CT (post-2019 J-series / A09C)
- Toyota Dyna / Hino-branded export chassis with J05/J08
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