U0194: Lost Communication With “Digital Audio Control Module B”

Possible Causes

• Faulty wiring or connectors in the CAN bus or network circuit
• Malfunctioning control module (e.g., ECM, TCM, BCM)
• Interference or noise in the communication network
• Loose or corroded connections
• Faulty network gateway or communication bus

Diagnosis and Repair

• Use an OBD-II scanner to confirm the U-code and related codes
• Inspect all wiring and connectors in the affected network circuit
• Check for loose or corroded connections and repair as needed
• Test the control module with a diagnostic tool
• Replace faulty modules or repair network wiring
• Clear codes and verify communication during a test drive

Related Error Codes

See also: U0100, U0101, U0102, U0103, U0104

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