- Mar 20, 2016
- 2017 Grand Sport 2lt. Watkins Glen Gray
I thought I would pass this on to C7 owners in case this happens to your car. Within a few days after taking delivery of my 2017 Grand Sport, the left-front turn signal stopped working. I took it back to the dealer. I was told that the entire turn signal/headlight assembly needed to be replaced because the turn signal bulbs are of the LED type. So, GM shipped a new assembly to my dealer. The dealer installed the new assembly, but it didn't work either. Eventually, it was discovered that the real problem was with a small computerized module box which actually controls the turn signal. So, GM shipped a new module box, which finally fixed the problem. The module box replacement process took 3.5 hours. They had to remove the front clip and left-front tire for access.