U0104 on Honda: How to Diagnose & Fix
Lost Communication With Cruise Control Module
1 Honda model · 1 documented issue · $600-$1,200 repair
U0104 on Honda by model: symptoms, diagnosis and fix
The millimeter-wave radar module for adaptive cruise control and the Collision Mitigation Braking System sits directly behind the Honda 'H' emblem in the CR-V's front grille, retained only by clips. Thieves pop the emblem and pull the sensor in under a minute; the modules resell for a few hundred dollars while dealer replacement plus aiming runs many times that. Multiple 2026 CR-V owners filed NHTSA complaints after repeat thefts — one owner had the sensor stolen, replaced, and stolen again. Dealers have reported mass overnight hits on their own lots. The car still drives, but ACC, CMBS, low-speed braking control and the road-departure functions go dark and the dashboard fills with driver-assist failure messages, and replacement modules have been on backorder.
Common Symptoms
- Honda emblem missing or hanging off the front grille
- Adaptive cruise control unavailable message
- Collision Mitigation Braking System problem warning at startup
- Multiple driver-assist failure messages after a parking-lot stop
- Empty bracket visible behind the grille badge
How to Fix
Fit an aftermarket steel radar shield/bracket that sandwiches the sensor with security fasteners behind the emblem — these are model-specific for the 6th-gen CR-V and cost a fraction of a replacement. Park with the nose in against a wall or another vehicle where possible, and add a front-facing camera. If the sensor is already gone, comprehensive auto insurance normally covers it as theft; budget roughly $600-$1,200 for the module plus the mandatory radar aiming procedure, and expect a parts wait. Do not drive assuming Honda Sensing will intervene once the module is missing — all radar-based functions are inoperative.
Sources for this issue (2)
U0104 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 U0104 mean on a Honda?
U0104 stands for "Lost Communication With Cruise Control Module." Sets when a module loses data-bus communication with the Cruise Control Module and stops receiving its expected messages. On many modern vehicles this also affects adaptive cruise/driver-assist features. On Honda it is documented across 1 model: CR-V.
What are the most common causes of U0104?
The most common causes of U0104 are: Open or shorted bus wiring to the cruise control module, Corroded or loose connector at the module, Blown fuse / lost power or ground, Low battery voltage, Failed cruise control module. The specific cause varies by vehicle.
How much does it cost to fix U0104 on a Honda?
Published repair estimates on Honda range from $600 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 U0104 on a different make?
View U0104 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.