B2402moderate severityBody
Blind Spot Monitor Sensor Circuit
on 2010 Cadillac CTS 3.0L V6 · AWD
What this code means
Malfunction in the blind spot monitoring (BSM) radar sensor, typically mounted in the rear bumper.
Symptoms
- Blind spot indicators not illuminating
- BSM warning light on dashboard
- System unavailable message
- False blind spot alerts
Common causes
- Faulty BSM radar sensor
- Sensor obstructed by bumper damage or dirt
- Sensor misaligned after rear collision
- Wiring damage
- Aftermarket trailer hitch blocking sensor
Diagnostic steps
- Clean rear bumper in sensor area
- Inspect for bumper damage near sensors
- Check sensor wiring
- Scan BSM module for codes
- Verify no aftermarket accessories blocking sensor
Repair notes
Replace BSM sensor or repair wiring. Recalibrate after replacement. Check for bumper damage blocking sensor field of view.
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Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0005
Driver Knee Airbag Deployment Circuit