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The adaptive cruise control on my 2105 Chevy Suburban started acting up several weeks ago.
The error messages include “front radar blocked” (clean front fascia, no mud in front of unit and and a clean windshield), “adaptive cruise control disengage” (occurs for no obvious reason), and “automatic collision prep unavailable” (again for no reason). At times it works fine and at other times I get no warning or braking when a vehicle slows in front of me. And worst of all, while on the way home from a trip to Upstate New York back to Detroit last Sunday, the brakes were applied four or five times automatically when I approach large flatbed and semi-trucks from behind, but two lanes to the right of me! This is a very danger situation when going seventy miles an hour. After these messages I can often re-engage the cruise control in a matter of five or ten minutes and it will work for a while and another error message will pop up. It happens at all three distance settings. GM Customer service and OnStar folks had no clue as I called them while on the road. There is no regular cruise control option when the vehicle has adaptive cruise control. I understand this was a problem with 2014 Chevy Impalas.
The truck is now at the dealer for diagnosis.
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The service adviser and technician were not able to find the root cause today, so the vehicle has been kept at the dealership for more investigation tomorrow. There seems to be a conflict in the technical repair instructions on whether to replace the sensor or not based on error code history. They could not duplicate any of the error codes during a road test , but I did once during a four-mile drive to the dealership this morning. I told him to replace the sensor. He was going to contact some GM engineering source before doing that.
The incidents of the brakes being applied when approach trucks happened on the straight stretches of I-75 between Detroit and Toledo.
I wish that there was a fail-safe mode allowing you to turn off the “adaptive” cruise and allow a regular cruise function to work.
Needless to say, I am not happy that after an entire day at the dealership there was no solution.
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After eight days dealer’s service tech did contact someone from technical service support, who finally convinced him to replace the radar module. There was also loose positioning device. It took three days to get the part from Lansing to Warren via Cincinnati. I tried it out on a road trip today and everything worked.
I did notify the owner of the dealership after four days and have yet to get an acknowledgement or an apology., and I am still waiting for an apology for the two month delay in getting my vehicle. Apparently he does not care about customers or my future business.
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Yeah, I figured it was a hardware issue with a sensor. The system wouldn’t just “bug out” like that. Good to hear it’s all fixed!
And you’re right, dealers can be hit-or-miss. Some of them care deeply and are very hands-on, others are quite the opposite. So long as the people who work there are competent and care, the attitude of the owner might not reflect theirs. Who knows?
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