P0480 Howo — cooling fan circuit, causes and repair

Fault codes / P0480

SAE P0480 is fan 1 control. Weichai scanners often show internal P00F7–P00FA or P0103 — type the factory code. Do not mix with P0217 (already overheated).

Which trucks see it

WP10–WP13 on Howo/Shacman, some WP7/WP6. Viscous, electric clutch or PWM — by year.

Symptoms

• fan dead or always on
• temp climb in traffic
• MIL
• internal Weichai fan codes on screen

Likely causes

• Need the internal Weichai code — OBD2 is a family label.
• Open/corroded clutch solenoid plug.
• Failed solenoid, clutch, relay or fan.
• Bad ground at the radiator loom.

What to check

1. Read the factory code, not only OBD2.
2. Does the fan engage hot.
3. Power at the solenoid.
4. If coolant is already red — see P0217. No invented clutch OEM.

Can you keep driving

If temperature is normal — limp to a shop. If it climbs — stop, same as P0217.

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
• P0093 — large fuel leak / CAN trap — FMI needed
• 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
• 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