Utrata komunikacji z TCM (sterownik skrzyni)
U1045
KrytycznyNo communication or serious interference on the CAN bus between the vehicle's control units. The code indicates a loss of network signal affecting multiple vehicle systems.
OBD-II (EN): CAN Communication Error or Severe Interference
Code U1045 indicates a serious communication failure on the vehicle's CAN bus – the network through which the engine, transmission, ABS, and other modules exchange data. The cause could be damaged wires, corroded connectors, or a faulty electronic module. Due to the impact on safety systems (ABS, airbags, ESP), immediate diagnosis by a specialist is recommended.
Symptoms
- Check Engine or MIL light is on - ABS, ESP/ESC, or airbag warning lights may be illuminated - Incorrect operation of the automatic transmission - Vehicle may enter limp mode - Lack of response from some electronic systems - Possible difficulty starting the engine - OBD scanner may show no communication with multiple modules
Possible causes
- Damaged or intermittent CAN bus wiring harness (short circuit, open circuit, corrosion) - Faulty or damaged control module (ECU, TCU, ABS, BCM, or other network node) - Corrosion or loose electrical connectors in the communication system - Short to ground or power on the CAN High / CAN Low line - Damaged CAN bus terminating resistor (typically 120 Ω at each end) - Electromagnetic interference or damaged network gateway
Affected systems
Related codes
Utrata komunikacji z BCM (moduł nadwozia)
Kod U1010 oznacza usterkę wewnętrznej magistrali komunikacyjnej modułu sterującego (CAN/SCP). Moduł wykrył nieprawidłowe dane lub brak komunikacji z innym węzłem w sieci pojazdu.
Brak komunikacji z bramką sieciową (gateway)
Utrata komunikacji z modułem ABS
Utrata komunikacji z ECM (sterownik silnika)
Magistrala CAN High Speed — brak komunikacji
Does code U1045 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.
