Question 1

What does U0073 mean?

Accepted Answer

U0073 - Control Module Communication Bus Off. CAN bus network is completely off — no communication occurring. Total network failure.

Question 2

What are the symptoms of U0073?

Accepted Answer

Multiple warning lights, Vehicle may not start, Many systems non-functional

Question 3

What causes U0073?

Accepted Answer

CAN bus wiring shorted together, CAN bus wiring open, Failed module shorting bus, Water damage

Question 4

How much does it cost to fix U0073?

Accepted Answer

Typical repair cost: $100-$2,000+. Complete CAN bus failure usually means wiring issue or one module pulling down the entire bus.

U0073 — Control Module Communication Bus Off

Don't guess — diagnose U0073 the right way