U0073

Control Module Communication Bus A Off

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Check Engine Light Is On
Disconnection or incorrect operation of various vehicle systems
Problems starting the engine
Dashboard malfunctions
Lost connection with diagnostic equipment

Causes

Broken CAN bus wires
Short circuit in CAN circuit
Corrosion or poor contact in connectors
Failure of one of the modules on the bus
Damage to CAN bus terminators

How to Fix

Check the integrity of the CAN bus wires
Check connections and connectors for corrosion
Diagnose modules on the CAN bus one by one
Check the resistance of the bus terminators
Replace damaged wires or connectors

Related codes

U0100 U0121 U0140