OBD-II Network Error Code U0155: How to Fix It

Q: Can I drive with U0155 error code?

You can usually drive short distances, but the instrument cluster may not work properly. Speedometer, fuel gauge, and warning lights may be unreliable. Get it diagnosed soon to prevent further issues.

Q: What causes U0155 code to appear?

Common causes include blown fuses, corroded wiring connections, damaged CAN bus wires, low battery voltage, faulty instrument cluster, or issues with other control modules on the network.

Q: How much does it cost to fix U0155?

Costs range from $50 for a blown fuse to $500-1500 for instrument cluster replacement. Most cases involving wiring repairs cost $200-600 depending on labor time and parts needed.

Q: Will U0155 cause my car to fail emissions testing?

Yes, communication errors prevent proper emissions system monitoring. The vehicle may not pass OBD2 readiness checks required for emissions testing until the code is resolved.

Q: Can a weak battery cause U0155?

Yes, low battery voltage can disrupt CAN bus communication and trigger U0155. The network requires stable 12V+ power to function properly. Always check battery condition first.

Abstract

Error code U0155 indicates your vehicle's control modules have lost communication with the instrument panel cluster (dashboard). This network communication failure can cause warning lights, gauge malfunctions, and diagnostic issues.