Exhaust Gas Recirculation Flow Excessive Detected
The HINO-P0402 (Hino) diesel fault code means: Exhaust Gas Recirculation Flow Excessive Detected. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
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What Are the Symptoms of HINO-P0402?
- Check Engine light
- Rough idle or smoke
- Possible reduced power
What Causes HINO-P0402? (Most Likely First)
- EGR valve sticking open High
- EGR position or flow sensor reading wrong Medium
- EGR valve actuator or circuit fault Medium
Can I Still Drive with HINO-P0402?
Short distances only. HINO-P0402 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P0402 mean on a Hino?
P0402 means Exhaust Gas Recirculation Flow Excessive Detected. The control module measured more EGR flow than it commanded.
Is P0402 a Hino-specific code?
No. P0402 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-P0402?
Command the EGR valve closed and confirm it seals.
Compare commanded and actual EGR position on a scan tool.
Inspect the valve for soot holding it open.
Sources 3
This page is built from documented references. Verify against your own service info before repair work.
- California Code of Regulations, Title 13 section 1971.1 (Heavy-Duty OBD)malfunction criteria, section (e)
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
- SAE J2012Diagnostic Trouble Code Definitions (defines P0402 as a generic OBD-II code)
P0402 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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