Yutong bus fault codes online

Yutong in ChinaDiag — start with ZK6122. Engine P/SPN may overlap truck Weichai cards; body/BCM modules need the system ID from the scanner.

Models

Yutong ZK6122

Symptoms

• engine derate;
• cluster U-codes;
• body lamp / door module faults;
• no communication on one bus segment;

Frequent codes

• P0087 — low common-rail pressure
• P0093 — large fuel leak / CAN trap — FMI needed
• P0299 — boost below target
• P0335 — crankshaft sensor no signal
• P0340 — camshaft sensor — FMI needed
• P2563 — VGT position sensor
• P0562 — system voltage low
• U0100 — lost communication with engine ECU
• SPN 2898 — without FMI — not a diagnosis
• SPN 729 — intake heater — FMI needed
• P0088 — high common-rail pressure
• P1011 — HP pump metering valve fault
• P2263 — turbo / boost performance
• U0101 — lost communication with TCM

Field notes

Do not treat every bus code as a truck rail fault — name the system (engine / BCU / door) in the form.

Fault code table

Yutong ZK6122 bus: partial overlap with engine P/SPN. Body modules need the system code from the scanner. Table — start for engine matches.

Full step-by-step — enter the code on the home page. If a card exists, click the code.

How to use

See ZK6122. On the home page set Yutong, code or photo.

Look up the code in the service