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Well my 2014 GMC Sierra (purchased new) with less than 30,000 miles showed a Malfunction Indicator Lamp (MIL - Engine Symbol Light) on dash last Wed - May 8th. I called OnStar and received the report via e-mail below - Code P050D. Truck ran fine. Scheduled truck into the dealer for Fri morn May 10th. Dealer kept truck until around noon the next Day to make certain code did not reappear on cold start. I picked up my truck and no problems since the P050D. Here is some of the repair receipt: #1 - 3202: Engine Repair Installed laptop and was unable to duplicate concern at this time. Tech tested and test drove several times and was not able to duplicate. Advised customer to return if concern returns. No repairs were made at this time. $85.00 plus tax. Is this it for diagnostics? Seems to me like the tech cleared the code - drove the truck - no code - calls it good. Drove truck yesterday on a 60 mile 90 percent highway trip and mileage on dash showed 19.2. Here are the results of your recent On-Demand Diagnostic request on your 2014 GMC Sierra. Module Diagnostic Code Diagnostic Information Recommended Action VIU - OnStar System None No Error Code Found None TCM - Transmission System None No Error Code Found None SDM - Airbag System None No Error Code Found None ABS - Braking and Stability System None No Error Code Found None ECM - Engine System P050D IGNORE UNKNOWN DTC No action needed Maintenance Information • Odometer: 29778 Miles • Remaining Oil Life: 57% If you require Roadside Assistance, please contact (866) 415-5838. Please bring this email with you when you go for service. Please see your dealer for service.