U0155 on Hyundai: How to Diagnose & Fix
Lost Communication with Instrument Cluster
2 Hyundai models · 2 documented issues · 1 critical
U0155 on Hyundai by model: symptoms, diagnosis and fix
The dominant electrical failure on the current Tucson is a software fault that blanks the digital instrument cluster, and on equipped cars the head-up display and center touchscreen along with it. Hyundai has recalled the vehicle for it twice: NHTSA campaign 26V047000 (March 2026) covered 2025-2026 Tucson, Tucson Hybrid and Tucson PHEV among a broad list of Hyundai models, and campaign 26V400000 (August 2026) recalled roughly 96,000 additional 2025-2026 Tucson, Tucson Hybrid and Tucson PHEV vehicles for the same defect — meaning the first software remedy did not fully resolve it. Both campaigns cite noncompliance with FMVSS 101, 'Controls and Displays,' because the driver loses the speedometer and warning telltales. Fifty-one NHTSA complaints on the 2025 Tucson carry an ELECTRICAL SYSTEM component. Owners describe the cluster showing a black screen with 'NO SIGNAL' for minutes at a time (ODI 11749421), dropping out for three seconds every one to two minutes and taking the side cameras with it (ODI 11729572), a daily and progressively worsening total blackout of cluster and infotainment (ODI 11731497), and one car diagnosed with a rear-view camera display failure behind the blank cluster (ODI 11715488). Several reports pair the blackout with the vehicle stalling or failing to start.
Common Symptoms
- Digital instrument cluster goes black displaying 'NO SIGNAL'
- Head-up display flickers or turns off, sometimes over bumps
- Center touchscreen glitches, strobes, freezes or blacks out
- Loss of speedometer and all warning telltales while driving
- Backup and side camera views unavailable
- All dashboard warning lights illuminate at once
How to Fix
Check your VIN against both NHTSA campaigns 26V047000 and 26V400000 — having had the first update performed does not mean you are covered for the second, and the second campaign exists precisely because the first remedy was insufficient. The remedy is a free instrument panel display software update delivered over the air or by a dealer; confirm at the dealer which software level is installed rather than assuming the OTA landed. If the blackout persists after the current update, insist the dealer stop treating it as a software item and inspect the cluster's harness connector and grounds, since several complaints correlate the dropout with bumps and rough pavement (ODI 11751042), which is a connector symptom rather than a software one. Where the failure coincides with stalling or a no-start, have the 12V battery and its terminals load-tested as well. Do not drive without a speedometer any longer than necessary; the fault is intermittent and can strand you without warning telltales.
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Sources for this issue (2)
Electrical noise generated inside the Power Management Integrated Circuit (PMIC) of the instrument panel cluster can cause the cluster to reboot intermittently while the vehicle is being driven, leaving the display blank for several seconds. During the blank period the speedometer, fuel gauge and telltale warning lamps are all unavailable. NHTSA campaign 26V047000 covers 41,651 Hyundai vehicles including the Santa Cruz. This is the driver's instrument cluster, which is a different module from the center infotainment head unit.
Common Symptoms
- Digital instrument cluster goes blank while driving
- Cluster restarts itself and shows the startup animation mid-drive
- Speedometer and gauges disappear for several seconds
- Warning telltales unavailable during the reboot
How to Fix
Free recall remedy: dealers verify the cluster software level and flash updated IP cluster software under campaign 26V047000. Hyundai is also pushing the fix over the air through Bluelink for owners who have opted into OTA updates, so eligible trucks may be remedied without a dealer visit. Dealer and customer notification was set for March 27, 2026.
Sources for this issue (3)
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 Hyundai?
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 Hyundai it is documented across 2 models: Tucson, Santa Cruz.
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 Hyundai?
Repair costs vary widely with the root cause and Hyundai 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.