B390C

Long Range Radar Sensor Module

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

Disabling adaptive cruise control
Automatic braking system malfunction
A warning message appears on the dashboard

Causes

Mechanical damage to the radar
Radar surface contamination
Open or short circuit in wiring harness
Problems with module power supply
Software glitch
ECU malfunction

How to Fix

Check the condition of the radar for damage and dirt
Clean the radar surface if necessary
Check the integrity of the wiring harness and connections
Check the module supply voltage
Scan the system for other errors
If necessary, replace the long-range radar module or ECU

Related codes

U0121 U0122 C1234