U0155 on Buick: How to Diagnose & Fix
Lost Communication with Instrument Cluster
1 Buick model · 1 documented issue · $150-$1,200 repair
U0155 on Buick by model: symptoms, diagnosis and fix
A recurring Gen1 electrical failure: the instrument cluster, radio and shifter illumination go completely dark for 5-20 seconds while the vehicle is moving, then come back on their own. NHTSA reports for the 2017 describe the display going 'very dim and sometimes completely out' during reversing, which also kills the backup camera and the rear cross-traffic warnings. Some owners report the blackout coinciding with brake and steering anomalies, suggesting a shared power/ground or body control module fault rather than an isolated cluster defect. Reports span roughly 200 to 90,000 miles with a heavy cluster between 7,000 and 50,000.
Common Symptoms
- Entire dashboard goes dark for 5-20 seconds while driving
- Radio, shifter and dash lights blank simultaneously
- Backup camera and rear cross traffic alert unavailable when reversing
- Dim or flickering instrument panel illumination
How to Fix
Load-test the battery and check the negative/chassis ground straps and the underhood fuse block connections before replacing modules. Check for and install updated BCM and cluster software. If the fault persists with good power and grounds, the instrument cluster itself is replaced and programmed to the VIN. Document the intermittent event on video, since dealers commonly cannot duplicate it.
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 Buick?
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 Buick it is documented across 1 model: Envision.
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 Buick?
Published repair estimates on Buick range from $150 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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.