U0155 on RAM
Lost Communication with Instrument Cluster
U0155 on RAM vehicles indicates lost communication with instrument cluster. Au7o has documented this code across 1 RAM model — most commonly on 1500. 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.
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 RAM by Model
RAM 1500(1 issue)
- Digital Instrument Cluster Goes Blank at Startup or While Driving (Recall 25V826 / 26V225)2025-2026
NHTSA campaigns 25V826 and 26V225 establish this identity for VIN-selected 2025-2026 RAM 1500 trucks. A software error can leave the instrument-panel display blank or unable to show safety information such as gear selection and warning lamps. The campaigns use different compliance scopes and remedies, so VIN status determines which action applies; neither campaign establishes an owner-frequency count.
Looking for U0155 on a different make?
View U0155 across all makes →Frequently Asked Questions
What does U0155 mean on RAM?▼
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 RAM specifically, this code is documented across 1 model.
What causes U0155 on RAM vehicles?▼
Common causes on RAM: 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 RAM?▼
Repair costs vary widely depending on the root cause and specific RAM model.
Which RAM models have U0155 documented?▼
Au7o has documented U0155 on 1 RAM model: 1500.