U0155: How to Diagnose & Fix — Lost Communication with Instrument Cluster
27 vehicles · 16 makes · $100-$2,200 repair
How to diagnose and fix U0155: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Jaguar S-TYPE · 2000–2008
The S-TYPE is notorious for electrical gremlins caused by moisture ingress into control modules and poor CAN bus connections. Phantom warning lights, inoperative features, and intermittent faults across multiple systems are common and difficult to diagnose without dealer-level equipment.
Common Symptoms
- Multiple warning lights illuminated simultaneously
- Windows or locks operating erratically
- Instrument cluster errors or flickering
- Intermittent no-start condition
- Features working one day and not the next
How to Fix
Check all module locations for moisture ingress, particularly the driver footwell and trunk. Clean and reseal all CAN bus connectors with dielectric grease. Reprogram affected modules with the latest software. Replace the 12V battery if it is over 4 years old.
Owner tips & cautions
- TipBuy an iCarsoft i930 Jaguar-specific scanner. It reads all Jaguar modules and saves thousands in dealer diagnostic fees. Essential tool for S-TYPE ownership.
Jaguar I-PACE · 2019–2025
The I-PACE suffers from excessive 12V auxiliary battery drain when the vehicle is parked. Multiple electronic modules fail to enter sleep mode properly, drawing power continuously from the 12V system. A dead 12V battery prevents the high-voltage system from activating, leaving the car completely immobilized.
Common Symptoms
- Dead 12V battery after 3-5 days of sitting
- Vehicle will not power on or unlock
- Infotainment system not booting
- Error messages on first startup after sitting
- Key fob not detected
How to Fix
Update the vehicle software to the latest OTA version, which improves module sleep behavior. Replace the 12V battery with a genuine Jaguar AGM battery. If the issue persists, a dealer needs to identify and reprogram the module that is not sleeping. Connect a battery tender if the car sits for more than 5 days.
Jaguar XJ · 2004–2012
The XJ suffers from cascading electrical faults caused by body control module (BCM) software glitches and CAN bus communication errors. Phantom warning lights, inoperative features, and intermittent failures across multiple systems are common, especially after battery disconnection or jump-starting.
Common Symptoms
- Multiple random warning lights illuminated
- Windows or sunroof operating on their own
- Central locking malfunction
- Instrument cluster errors
- Intermittent failure of various electrical accessories
How to Fix
Have the BCM reprogrammed with the latest JLR software at a dealer. Check all ground connections for corrosion, especially the main chassis ground behind the engine. Replace the 12V battery with a genuine Jaguar-spec AGM battery. Avoid jump-starting without a proper battery management system.
Owner tips & cautions
- TipAlways maintain the 12V battery in good condition. A weak battery is the #1 cause of BCM glitches on the XJ. Use a battery tender if the car sits for more than a week.
Jeep Gladiator · 2020–2022
Kia Seltos · 2021–2024
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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?
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.
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?
Repair costs for U0155 range from $100 to $2,200, depending on the vehicle and root cause.
Which vehicles are affected by U0155?
Au7o has documented U0155 across 27 vehicle models from 16 manufacturers: Buick, Chevrolet, Chrysler, Ford, GMC, Hyundai, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Mercedes-Benz, RAM, Toyota, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.