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2020 Buick Encore GX - Blind Spot Monitor Malfunction

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Mike T. · rep 0 · May 22, 3:51 AM · 1 replies · solved · Question

Vehicle: 2020 Buick Encore GX Essence

My 2020 Buick Encore GX Essence has been giving me trouble with its blind spot monitoring system. Lately, the warning light for the blind spot monitor (BSM) comes on intermittently, and sometimes the system just stops working altogether. It's really concerning, especially when changing lanes.

There's no check engine light, and I haven't noticed any other electrical issues. I've tried cleaning the rear bumper where the sensors are located, but that hasn't helped. Is this a common problem with the Encore GX?

Could it be a loose connection or a faulty sensor? What should I check before I have to take it to the dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:51 AM

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ClearTheCode admin answer:

Blind Spot Monitor (BSM) malfunctions on vehicles like your 2020 Buick Encore GX can be frustrating and impact safety. While cleaning the sensors is a good first step, the issue often lies deeper.

Here are common causes and diagnostic steps:

  1. Sensor Contamination/Obstruction: Even after cleaning, sometimes internal condensation or a very subtle obstruction (like a sticker or paint chip) can interfere. Ensure the sensor areas on the rear bumper are completely clear and undamaged.

  2. Wiring Harness Issues: The wiring connecting the BSM sensors to the control module can become damaged, corroded, or loose over time, especially in areas exposed to road grime and moisture. Inspect the wiring harness leading to the sensors in the rear bumper for any visible signs of wear or damage.

  3. Faulty BSM Sensor: The sensors themselves can fail internally. They are delicate electronic components. If one sensor is intermittently failing, it can cause the entire system to malfunction.

  4. BSM Control Module Failure: Less common, but the control module that processes the sensor data can also fail. This typically results in more consistent system failure rather than intermittent issues.

  5. Software Glitch: Sometimes, a simple system reset can resolve temporary glitches. Try disconnecting the battery for 15-20 minutes to reset the vehicle's electronics (ensure you know how to reset any radio codes or memory settings afterward).

When to See a Shop: If cleaning and a battery reset don't resolve the issue, it's highly recommended to take your Encore GX to a Buick dealership or a reputable automotive electrical specialist. They have diagnostic tools (like a Tech2 or GDS2 scanner) that can communicate directly with the BSM module. This allows them to read specific fault codes (which may not trigger a check engine light) and pinpoint which sensor or component is failing, saving you time and money on guesswork. Calibration of new sensors is also often required after replacement.

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