U0155 on RAM: How to Diagnose & Fix
Lost Communication with Instrument Cluster
1 RAM model · 1 documented issue · 1 critical
U0155 on RAM by model: symptoms, diagnosis and fix
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.
Common Symptoms
- VIN checked for 25V826 and 26V225
- blank or failed display condition recorded
- cluster, power and vehicle-network faults preserved
- software remedy separated from hardware replacement
How to Fix
Check the VIN for 25V826 (FCA B4C/B8C) and 26V225 (FCA 35D). Have the dealer inspect and update instrument-cluster software or replace the cluster when the applicable campaign requires it, free of charge. If the display fails while driving, avoid relying on missing gear or warning information, move to a safe location and arrange service. Outside an open campaign, preserve cluster, body and network faults before diagnosis. Do not buy a cluster, display or control module from this page; campaign eligibility, software level, coding, current part number and VIN fitment must be established first.
Sources for this issue (2)
U0155 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0155 mean on a 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 it is documented across 1 model: 1500.
What are the most common causes of U0155?
The most common causes of U0155 are: 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. The specific cause varies by vehicle.
How much does it cost to fix U0155 on a RAM?
Repair costs vary widely with the root cause and RAM model; each issue on this page carries its own estimate where one is published.
Looking for U0155 on a different make?
View U0155 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.