P0562 Howo — low system voltage, causes and repair

Fault codes / P0562

Supply below threshold. On 24V Howo that is batteries, alternator or a rotten ground. Fake U-codes often follow.

Which trucks see it

WD615, WP10–WP13, MC11, ISM11. Worse in winter.

Symptoms

• slow crank
• random code pile
• cluster glitches

Likely causes

• Weak alternator or belt.
• Flat batteries, dirty posts.
• Bad cab/frame/engine grounds.

What to check

1. Rest ~12.6 V per 12V battery; running 24V system about 27.5–28.8 V.
2. Belt and pulley.
3. Ground straps.
4. If voltage is good at the batteries, measure at the ECU plug.

Can you keep driving

If it cranks strong, limp is fine. If voltage sags on the road, do not night-run it.

Look up the code in the service

Other codes

• P0087 — low common-rail pressure
• P0193 — rail pressure sensor high signal
• P0299 — boost below target
• P0335 — crankshaft sensor no signal
• P0401 — EGR insufficient flow
• U0100 — lost communication with engine ECU
• P0201 — cylinder 1 injector circuit
• P0116 — water in fuel (Weichai table) / not always coolant SAE
• P2509 — intermittent ECM power (no OEM in DB)