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U0001 fault code: what it means

U0001: High-speed CAN bus communication fault; modules cannot talk to each other properly.

Network (communication between modules) · Costly if missed

Usual causes, most likely first

  1. low battery voltage or poor earths
  2. damaged CAN wiring
  3. corroded or water-damaged connector
  4. faulty module pulling the bus down

U0001 by make

GWM

High-speed CAN communication bus fault. Several modules lose contact with each other.

Usual causes: poor connection or water in a CAN connector; faulty module dragging the bus down; low battery voltage

Haval

High-speed CAN communication bus fault.

Usual causes: poor connection in a CAN connector; faulty module on the bus; low battery voltage

LDV

High-speed CAN communication bus fault.

Usual causes: poor connection in a CAN connector; faulty module on the bus; low battery voltage

MG

High-speed CAN communication bus fault.

Usual causes: poor connection in a CAN connector; faulty module on the bus; low battery voltage

Not sure what U0001 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.