2015 GM Truck 2500HD Transmission Shifting Erratic, Speedo Cuts Out, P0721 @PhillipBailey
2015 GM Truck 2500HD Transmission Shifting Erratic, Speedo Cuts Out, P0721 @PhillipBailey
Uploaded June 2026 | Updated September 2026, 2 weeks ago
This 2015 GMC was in a couple days ago with multiple complaints and at that time it had a history code of P0721 but it did not return. Now it's back. Replacing the VSS turned into a shit show...
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Phillip Bailey |

2015 GM Truck 2500HD Transmission Shifting Erratic, Speedo Cuts Out, P0721

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