U0155 on GMC
Lost Communication with Instrument Cluster
U0155 on GMC vehicles indicates lost communication with instrument cluster. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. This is a network communication code meaning a control module (usually the engine or body computer) has lost communication with the instrument cluster over the vehicle's data bus. Modern vehicles share information between modules over a network (such as CAN), and the cluster both displays data and relays messages. When messages from the cluster stop arriving, this code sets. You may see warning lights, dead or erratic gauges, missing displays, or other modules acting up. It usually points to wiring, power/ground, or the cluster itself rather than the engine. Typical repair costs on GMC range from $150 to $1,000, depending on the specific model and root cause.
Common Causes of U0155
- •Faulty instrument cluster
- •Loss of power or ground to the cluster
- •Damaged or corroded CAN bus wiring
- •Loose or corroded connectors at the cluster
- •Blown fuse feeding the cluster
- •Short or open on the communication bus
- •A different failed module dragging down the bus
U0155 on GMC by Model
GMC Sierra 3500HD(1 issue)
- Dashboard Instrument Cluster Pixel and Display Failure2015-2020
The instrument cluster in 2015-2020 Sierra 3500HD trucks suffers from LCD pixel failure, causing portions of the Driver Information Center (DIC) display to become unreadable. Individual pixels or entire segments go blank, making it impossible to read trip computer data, gear indicator, or warning messages. The issue is caused by solder joint failure on the cluster circuit board from thermal cycling and vibration. The speedometer and tachometer gauges may also develop stepper motor failures, causing inaccurate or stuck readings.
Looking for U0155 on a different make?
View U0155 across all makes →Frequently Asked Questions
What does U0155 mean on GMC?▼
U0155 stands for "Lost Communication with Instrument Cluster." This is a network communication code meaning a control module (usually the engine or body computer) has lost communication with the instrument cluster over the vehicle's data bus. Modern vehicles share information between modules over a network (such as CAN), and the cluster both displays data and relays messages. When messages from the cluster stop arriving, this code sets. You may see warning lights, dead or erratic gauges, missing displays, or other modules acting up. It usually points to wiring, power/ground, or the cluster itself rather than the engine. On GMC specifically, this code is documented across 1 model.
What causes U0155 on GMC vehicles?▼
Common causes on GMC: Faulty instrument cluster, Loss of power or ground to the cluster, Damaged or corroded CAN bus wiring, Loose or corroded connectors at the cluster, Blown fuse feeding the cluster. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0155 on a GMC?▼
Repair costs on GMC range from $150 to $1,000, depending on the specific model and root cause.
Which GMC models have U0155 documented?▼
Au7o has documented U0155 on 1 GMC model: Sierra 3500HD.