I had the same issue multiple times. Took 4 replacements of the DEF injector to get a good one. Chevy ponied up with an extended coverage letter. You might write to them explaining the issue. Nice how the DEF system isn't considered in the fed warranty as a major component. Haven't had any issues since the 4th replacement.
Try writing to Chevy at the following address, and be sure to detail each issue you had with services completed, costs, copies of service receipts, and the results.
Chevrolet Customer Assistance Center
P.O. Box 33136
Detroit, MI 48323-5136
It's worth a shot.
Try writing to Chevy at the following address, and be sure to detail each issue you had with services completed, costs, copies of service receipts, and the results.
Chevrolet Customer Assistance Center
P.O. Box 33136
Detroit, MI 48323-5136
It's worth a shot.