Just sharing and venting. I have had continuous problems over the last 4000 miles with check engine lights and limp mode messages on my car. In to the dealer each time. Each time codes cleared, software updated. The troublesome thermostat has been replaced once and I am waiting for it to be replaced a second time. The part is apparently on backorder and maybe was going to come in next week.
Twice along with the check engine light the car has gone into limp mode. The first time it would go in and out but the check engine light would never flash. Dealer told me unless it was red or flashing I could keep driving it. Been driving with the check engine light on for several weeks now waiting on a part (after Volvo sent it home with me that way). Two nights ago experience sudden loss of power, gray smoke out the rear end somewhere, and check engine light flashing. Should probably add that 2 check engine lights ago there was a odd metallic screeching sound and what sounded like something depressurizing in the rear. Volvo could not find anything wrong then. Anyway - they are now telling me the *think* the ERAD has failed but are waiting for Volvo Tech support. All of this has occurred within 4000 miles from first light to now. The car will be a year old on Feb 9th.
I have submitted a lemon law letter to Volvo to try and light a fire under somebody to get things fixed. Love the car but very tired of staring at a check engine light Volvo can't seem to fix.
The dealership told me they have seen a lot of these ERAD failures but I don't know that I have heard anyone here mention that - but I may not have looked hard enough.