2020 Kia Sorento Blind Spot Monitor Not Working: Diagnosis & Fixes

Experiencing a malfunction with your 2020 Kia Sorento's blind spot monitor (BSM) system can be unsettling, impacting your confidence on the road. Whether the indicator light isn't illuminating, you're receiving a constant warning, or the system simply fails to detect vehicles in your blind spots, addressing this issue promptly is crucial for safety. The BSM system is designed to enhance driver awareness, providing visual and sometimes audible alerts when another vehicle enters a designated blind spot area. When this vital safety feature isn't functioning correctly, it compromises one of your vehicle's advanced driver-assistance systems (ADAS).

This comprehensive guide will help 2020 Kia Sorento owners understand the common reasons why their blind spot monitor might not be working, how to perform initial diagnostic checks, and what steps can be taken to resolve the problem. For more information on Kia vehicles, visit our Kia vehicle hub.

What Drivers Notice

When the blind spot monitor system in your 2020 Kia Sorento begins to malfunction, drivers typically observe a few key indicators. The most common is the absence of the expected visual alert in the side mirrors when a vehicle enters the blind spot. Conversely, some drivers might experience a persistent warning light even when no vehicle is present, or the system might issue false alarms. These inconsistencies can be distracting and erode trust in the system, leading to a less confident driving experience. It's important to differentiate between a temporary glitch and a persistent problem that requires attention.

At a glance: difficulty, repair cost, and diagnostic workflow

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: No Indicator Light: The BSM warning light in the side mirror fails to illuminate when a vehicle is in the blind spot, ev; Constant Warning Light: The BSM warning light remains illuminated continuously, regardless of whether there's a vehicle ; False Alarms: The system triggers alerts (visual or audible) when there's no vehicle nearby.
• Estimated Repair Cost: $100–$900 (parts + typical shop labor)
• OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

Symptoms of a Malfunctioning Blind Spot Monitor

Recognizing the specific symptoms is the first step toward effective diagnosis. If your 2020 Kia Sorento blind spot monitor is not working, you might observe one or more of the following:

• No Indicator Light: The BSM warning light in the side mirror fails to illuminate when a vehicle is in the blind spot, even when the system is active.
• Constant Warning Light: The BSM warning light remains illuminated continuously, regardless of whether there's a vehicle in the blind spot or not.
• False Alarms: The system triggers alerts (visual or audible) when there's no vehicle nearby.

---

Related pages

• All repair guides
• Browse vehicles
• Browse OBD-II codes
• Kia vehicle hub
• Sorento model hub

---

This guide is not a substitute for OEM service procedures; use a qualified technician for safety-critical repairs.

Frequently asked questions

How urgent is this problem?

If symptoms are worsening or safety systems are affected, diagnose soon; minor issues can often wait for a scheduled service visit.

Can I drive with this issue?

Short trips may be acceptable for some faults, but stop driving if you notice overheating, loss of braking, steering problems, or strong fuel smells.

Do I need a dealer scan tool?

A basic OBD-II scanner helps confirm codes; some steps still need visual checks and meter tests described above.

Explore related guides on ClearTheCode

• Browse OBD-II codes
• All repair guides