2024-2025 Traverse Front Radar Sensor: ADAS Faults & Calibration Guide

Symptoms of a Failing Front Radar Sensor

When the front radar sensor has a problem, your vehicle will typically disable the related safety features and display a warning message on the driver information center. The most common symptoms include:

• "Adaptive Cruise Control Temporarily Unavailable" Message: This is the most frequent symptom of a blocked, misaligned, or failing front radar sensor.
• "Service Driver Assist System" Message: A general warning indicating a fault within the ADAS network, often pointing to the radar or camera systems.
• "Forward Collision System Unavailable" Message: This specific alert indicates the automatic emergency braking and forward warning systems are offline.
• Super Cruise Becomes Unavailable: On vehicles equipped with this feature, a radar fault will prevent Super Cruise from engaging.
• Adaptive Cruise Control Will Not Engage: The ACC system may refuse to turn on or may shut off immediately after being activated.
• Erratic System Behavior: In rare cases of a malfunctioning (but not completely failed) sensor, the ACC may brake erratically or fail to respond to traffic.

Known Issues, TSBs, and Recalls

For the 2024-2025 Traverse, many ADAS-related issues are caused by software glitches 🎬 See this detailed walkthrough of the 2024 Traverse rather than hardware failure. GM has released several Technical Service Bulletins (TSBs) to address these problems.

Software-Related Faults (TSB PIT6167G)

Many owners of 2024-2025 Traverses have reported intermittent "Adaptive Cruise Unavailable" messages even in clear weather. GM has acknowledged this as a known software issue in TSB PIT6167G. This bulletin specifically instructs dealership technicians NOT to replace the radar sensor module for this condition, as a software fix is the intended solution. If you experience this intermittent issue, you should mention this TSB to your service advisor, as it could prevent an unnecessary and costly hardware replacement.

Calibration Learn Procedure (TSB PIT6394B / 25-NA-029)

These new models use a different type of long-range radar that requires a specific "learn" procedure for calibration. Unlike older systems that could be calibrated on an open highway, this new radar needs to be driven in a city or urban environment to detect a variety of objects like mailboxes, guardrails, parked cars, and oncoming traffic at a following distance of 50-150 feet. A technician may report that the sensor will not complete its learn procedure, which is often due to the wrong driving conditions being used for the dynamic calibration.

Recalls

As of early 2026, there are no widespread hardware recalls for the front radar sensor on the 2024-2025 Chevrolet Traverse. Always check the official NHTSA website for the most up-to-date recall information for your specific vehicle.

Buying a Used Radar Sensor

A used OEM radar sensor can be a cost-effective alternative to a new part, but there are critical factors to consider. This is not a simple plug-and-play component.

• Match the Part Number Exactly: While several part numbers may look similar, you must match the number from your vehicle's original sensor. Using the wrong part can lead to system incompatibility. The most likely part number for the front cruise control sensor is 86813188, but always verify with your original part.
• Physical Inspection: Inspect the used sensor for any signs of physical damage. Check for cracks in the plastic housing, damage to the front face (the "lens"), and bent or corroded connector pins. Do not purchase a sensor with visible damage from a collision.
• Budget for Calibration: This is the most important step. A used sensor is useless without professional calibration. The cost of calibration can be several times the cost of the used part itself. Factor this significant expense into your budget before buying.
• Why Used OEM is a Good Choice: For this part, a used OEM sensor that has been properly calibrated is functionally identical to a new one. There are no known aftermarket alternatives for this new of a vehicle, making a recycled OEM part the only budget-friendly option.

Installation and Calibration

Physically replacing the sensor is relatively simple, typically involving removing the front grille or bumper cover to access a few bolts and an electrical connector. However, the mandatory calibration process makes this a job for a professional shop with ADAS service equipment.

Difficulty: 4 out of 5. The physical swap is a 2, but the required calibration makes this a non-DIY job.

1. Physical Installation: The sensor is unbolted from its bracket, the connector is unplugged, and the new sensor is installed.
2. Mandatory Calibration: After installation, a technician must use a specialized scan tool to initiate the sensor's learn procedure.
3. Dynamic Calibration Drive: The technician will then drive the vehicle in a specific urban environment, allowing the sensor to see a wide variety of stationary and moving objects to learn its position and alignment relative to the car's centerline. This can take a significant amount of time.
4. Verification: The process is complete only when the scan tool confirms the learn procedure has finished successfully. The technician will then test the ACC and FCA functions to ensure they work correctly.

Cost Comparison

Prices can vary by location and supplier. The primary cost of this repair is the specialized labor for calibration.

Frequently Asked Questions (FAQ)