U0155 Code: Lost Communication with Instrument Cluster — Causes & Fix
U0155 means lost communication with the instrument panel cluster (IPC) — the gauges/display module on the network.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $50 – $800
- Time to fix
- 1–4 hours
What it means
Causes include cluster power/ground loss, CAN wiring faults, or a failed cluster. U0155 is a generic OBD-II network/communication ("U") code defined in the SAE J2012 standard, so it applies to virtually any modern OBD-II vehicle regardless of make. These faults usually point to the vehicle's data bus (often CAN) or a module that has dropped off the network. Fix the wiring/module fault, then clear the code with a scan tool.
Symptoms
- Dead or erratic gauges/warning lights
- Cluster display blank or frozen
- Other network warnings
How to fix it
- 1
Check cluster power and wiring
1. Verify the cluster has power and good grounds. 2. Inspect the CAN wiring to the cluster.
- 2
Diagnose the cluster
1. Scan whether the cluster responds. 2. Repair wiring or address the cluster, then clear the code.
Frequently asked questions
Why are my gauges dead with U0155?
If the network can't reach the instrument cluster, the gauges and warning lights stop updating. Check the cluster's power, grounds, and CAN wiring.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.