Utrata komunikacji z BCM (moduł nadwozia)
U0230
ŚredniCommunication error in the reverse input circuit – loss of signal or disturbance in the vehicle's CAN/LIN network.
OBD-II (EN): Lost Communication with Reverse Input Circuit
Code U0230 indicates a network communication problem in the reverse gear signal circuit – this may involve the wiring harness, electrical connectors, or one of the vehicle's control modules. It manifests as incorrect operation of the backup camera, parking sensors, or other systems dependent on reverse gear. Diagnosis requires an OBD-II scanner and analysis of electrical schematics, so a visit to an authorized service center or well-equipped workshop is recommended.
Symptoms
Incorrect operation of systems dependent on the reverse gear signal (e.g., backup camera, parking sensors, auto-dimming mirrors); possible deactivation of parking assist systems; fault warning light (MIL) or network system warning light on the dashboard; sporadic resetting of control modules.
Possible causes
• Damaged or chafed wiring harness in the reverse signal circuit • Corrosion or loose electrical connectors at the control module or transmission • Faulty module transmitting the reverse signal (e.g., TCM – Transmission Control Module) • Short circuit to ground or supply voltage in the CAN/LIN communication line • Failure of the receiving module itself (e.g., backup camera module, BCM)
Affected systems
Related codes
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Does code U0230 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.
