2014-2020 Kia Sorento Blind Spot & Collision Sensor Guide: Failures, Fixes, and Calibration

Understanding Your Sorento's Driver-Assist Systems

Before troubleshooting, it's important to know which system is having a problem. The 2014-2020 Kia Sorento uses several distinct sensors for its safety features, and a failure in one can disable others.

• Blind Spot Detection (BSD) / Rear Cross-Traffic Alert (RCTA): This system uses two radar units located behind the plastic cover at the left and right corners of the rear bumper. They monitor adjacent lanes and the area behind you when reversing.
🎬 Watch this overview of Kia's blind spot detection system
• Forward Collision-Avoidance Assist (FCA) & Smart Cruise Control (SCC): This uses a forward-facing radar, usually mounted in the lower grille or behind the Kia emblem, and sometimes a windshield-mounted camera. It watches for vehicles and pedestrians ahead.
• Around View Monitor (AVM): This optional system uses cameras in the front grille, tailgate, and under each side mirror to create a 360-degree view for parking.

Common Symptoms of Failure

When a sensor or its related wiring fails, your Sorento will typically display a specific warning message on the instrument cluster.

Warning Lights and Messages

The most common sign of a problem is a persistent warning light on your dashboard. You will likely see a master warning light (an orange triangle with an exclamation point) along with a message like:

• "Check BSD (Blind Spot Detection) system": This points directly to a fault with the rear corner radar units or their wiring.
• "Blind-spot safety system disabled. Radar blocked": This message can appear temporarily due to obstructions like snow, heavy rain, or mud on the bumper. If it stays on after cleaning the bumper, it indicates a hardware or alignment fault.
• "Check Forward Collision-Avoidance Assist system": This indicates a problem with the front-facing radar or camera. Smart Cruise Control will also be disabled.
• "Check side view mirror warning light": This specific message suggests the warning LED in the mirror itself has failed, though the radar may still be working.

Incorrect or Missing Alerts

A failing system may also exhibit performance issues without a constant warning light. These can be more dangerous as they create a false sense of security.

• No warnings at all: The system fails to light up or beep for a vehicle in your blind spot.
• Constant false alerts: The system beeps or lights up when there is no vehicle present, which can be caused by a misaligned sensor.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While no widespread recalls exist for the rear blind spot radar units on the 2014-2020 Sorento, related systems have had issues. It's common for these sensors to fail from minor rear-end impacts that crack the internal components or knock them out of alignment. Water intrusion into the sensor or its electrical connector is another frequent cause of failure, leading to corrosion.

• Rearview Camera Recall (2019 Sorento): Some 2019 models were recalled because a manufacturing error could allow water to leak into the rearview camera, causing the image to fail. Dealers will add waterproofing or replace the camera.
• AEB Software Recall (2020 Sorento): In some markets, MY2020 Sorentos were recalled for a software issue where the Autonomous Emergency Braking (AEB) system might not detect a stationary vehicle or pedestrian. This is typically fixed with a software update at a dealership.
• General TSBs for BSD systems: Kia has issued general bulletins for its BSD systems that outline troubleshooting for the "Check BSD" message. The procedure often involves checking for bumper damage, obstructions, and using a dealer-level scan tool to check for Diagnostic Trouble Codes (DTCs) and perform recalibration.
🎬 See how to troubleshoot a Check BSD warning light

Buying a Used Collision Avoidance Sensor

Purchasing a used OEM sensor can save you hundreds of dollars compared to a new part from the dealer. However, because these are sensitive electronics, careful inspection is key.

Step 1: Identify the Correct Part Number

This is the most critical step. Sensors for the left and right sides are different and not interchangeable. Furthermore, part numbers can change mid-generation. The only way to guarantee compatibility is to match the part number from your original sensor. The rear blind spot radars are located behind the rear bumper cover; you may need to remove the bumper to access and read the part number on your failed unit.

Common rear blind spot radar part numbers for 2014-2020 Sorento include:

• 95811-C6010: Left (Driver Side) Rear Blind Spot Radar Unit
• Other related part numbers from this system include 95810C6000, 95820C6000, and 95821C6000. Always verify the exact number on your part.

If you need a side mirror camera for the AVM system, a common part number is:

• 99230-C5000: Right (Passenger Side) Mirror Camera

Step 2: Physical Inspection of the Used Part

When you receive the used sensor, inspect it carefully before installation:

• Check the Housing: Look for any cracks, even hairline fractures. A compromised housing will allow moisture inside, leading to premature failure.
• Inspect the Connector: The electrical connector pins should be clean, straight, and free of any green or white corrosion.
• Examine Mounting Points: Ensure all mounting tabs and brackets are intact. A sensor that isn't mounted securely will be misaligned and will not function correctly.

Step 3: Why Used OEM is a Smart Choice

For a complex electronic part like this, a used OEM sensor is often a better choice than a new aftermarket one. An original Kia part is designed to communicate perfectly with your vehicle's other control modules. Aftermarket sensors can have compatibility issues, leading to persistent error codes or improper function, even if they look identical. A reliable used OEM unit provides the same performance as a new one for a fraction of the price.

Cost to Replace a Sorento Collision Avoidance Sensor

The cost can vary significantly depending on which sensor has failed and whether calibration is required.

Installation and Calibration

Difficulty: 4 out of 5

Replacing a rear blind spot sensor is a moderately difficult job for a DIY mechanic, primarily because it requires removing the entire rear bumper cover. The sensors themselves are typically held on by a few bolts or clips.

Frequently Asked Questions (FAQ)