P0093 Howo — high-pressure leak or CAN timeout

Fault codes / P0093

Without the scanner caption and FMI this is not a diagnosis — same trap as P0116. SAE: Fuel System Leak Detected – Large Leak. Weichai table (ramid): internal P0093 is CANTSC1DE timeout, SPN 522037 FMI 8, OBD2 column U0121. Field Bosch text on Howo: supply pump lost load due to hand-pump leakage. The screen wins. No OEM.

Which trucks see it

Howo, Shacman, Sitrak, Weichai WD615/WP10–WP13. Type P0093, 522037/8 or U0121 as shown.

Symptoms

• wet rail fittings — fuel branch
• rail actual collapsing
• U0121/CANTSC with a dry engine — CAN branch

Likely causes

• SAE fuel: large HP leak.
• Weichai 522037/8: CAN timeout, not a rail.
• Do not pick a branch without FMI/caption.

What to check

1. Read caption and FMI.
2. Fuel: find wet fittings, do not load the engine.
3. CAN: 60 Ω, power, cab loom.
4. No OEM in the card.

Can you keep driving

Fuel spray — stop, tow. CAN branch — limp if it still runs. Home form: P0093 or a photo.

Look up the code in the service

Other codes

• P0087 — low common-rail pressure
• P0088 — high common-rail pressure
• P1011 — HP pump metering valve fault
• P0193 — rail pressure sensor high signal
• P0299 — boost below target
• P2263 — turbo / boost performance
• P2563 — VGT position sensor — range / performance
• P0335 — crankshaft sensor no signal
• P0340 — camshaft sensor (CMP) — FMI needed
• P0401 — EGR insufficient flow
• U0100 — lost communication with engine ECU
• U0101 — lost communication with TCM
• U0155 — lost communication with instrument cluster
• P0562 — system voltage low
• P0201 — cylinder 1 injector circuit
• P0480 — fan control circuit
• P0217 — engine overheat
• P0116 — water in fuel (Weichai table) / not always coolant SAE
• P2509 — intermittent ECM power (no OEM in DB)
• SPN 2898 — without FMI — not a diagnosis (config / Weichai grid)
• SPN 729 — intake heater — FMI needed