Cruise Control Problems of Volvo XC90

1) adaptive cruise control suddenly shuts off while driving on the highway, error message appears on the screen: "windscreen sensor, sensor blocked, see owner's manual", the appearance of the sensor on the outside of the car appears clean and even after scrubbing the sensor area the error still occurs. The car has been repaired for this same problem over 5 times including total replacement of the the windscreen sensors, with the problem still persisting. 2) dashboard went blank and computer rebooted while driving.

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This report is about a hazardous situation with our 2004 Xc90. The engine shut down without warning on the i5 freeway! the car suddenly lost power and we had to coast to the side in the dark. We were lucky to not get hit! the display showed the following error code: ecm-981a. We are aware of the fact that this problem is not new to NHTSA and that you have received several reports on it already. It appears that the problem has to do with the cruise control, and ever since the incident we have been driving the car without engaging it without any problems. The mileage on the car is 138,000 miles. The problem occurred when engaging the cruise control on an uphill slope. We speculate that it might be caused by engaging the cruise control at the same instant as the car shifts down automatically. I talked to a Volvo service technician who aid that he had experienced the same problem with his own 2004 Xc90 but he was unable to find what had caused it.

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The sunroof drain has a design flaw that can cause water to enter the passenger compartment and/or electrical systems. This can present simply as water on the floor boards. But it can also present in more subtle ways with water coming in contact with electrical systems and being drawn throughout the car through copper wires acting as conduit (this effects speaker quality, radio function, cruise control function etc). Most importantly, water can accumulate in the compartment under the front passenger seat that houses the dynamic stability traction control system putting safety at risk. We have experienced this with our Xc90 but see many complaints regarding other Volvo models. This is a significant safety concern but most concerning because of its subtle nature, slow progression, and prohibitive costs to repair. Many people are driving around with compromised systems and are not yet aware, unable to recognize the cause, or unable to fund the repair.