U0406
Invalid Data Received from Cruise Control Front Distance Range Sensor
ACC receives bus messages from the radar but their content is implausible (e.g. negative distances, jittering targets). Adaptive cruise is disabled until the radar reports plausible data again.
ACC receives bus messages from the radar but their content is implausible (e.g. negative distances, jittering targets). Adaptive cruise is disabled until the radar reports plausible data again.
Common causes
- high
Radar obstructed by snow/dirt
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-1650
- medium
Radar misaligned after collision
A plausible cause — test and verify before replacing parts.
Typical part cost: $90-1650
See all causes + fix costs
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does U0406 mean?
U0406 means "Invalid Data Received from Cruise Control Front Distance Range Sensor". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U0406?
radar obstructed by snow/dirt; radar misaligned after collision; gateway module routing can messages incorrectly — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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