What Does U043B Mean?
The cruise control system is receiving corrupt or implausible distance data from the left front radar/ultrasonic sensor. This affects adaptive cruise control and collision avoidance functions.
Common Causes
30%
Misaligned or obstructed left front distance sensor
25%
Damaged wiring or connector at left distance sensor
25%
Failed left front distance range sensor module
15%
Water or dirt contamination on sensor face causing false readings
5%
Aftermarket parts or accessories interfering with sensor field of view
Diagnostic Steps
1
Step 1: Visually inspect left front distance sensor for physical damage, dirt, ice, or obstructions on sensor face
2
Step 2: Check sensor mounting alignment and verify sensor is not loose or aimed incorrectly
3
Step 3: Inspect wiring harness and connector at left sensor for damage, corrosion, or proper seating
4
Step 4: Use scan tool to view live distance readings from left sensor and compare to right sensor for consistency
5
Step 5: Perform sensor calibration procedure if available in scan tool menu after cleaning and alignment
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The cruise control system is receiving corrupt or implausible distance data from the left front radar/ultrasonic sensor. This affects adaptive cruise control and collision avoidance functions.
The most common cause of U043B (Invalid Data Received From Cruise Control Front Distance Range Sensor Left) is: Misaligned or obstructed left front distance sensor
Typical repair costs for U043B range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Adaptive cruise control and forward collision warning systems may be disabled or function improperly. Driver must maintain manual control and vigilance; automatic emergency braking may not function.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U043B to identify the root cause.
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Quick Info
Category
Network
System
Adaptive Cruise Control / ADAS
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
