Duramax LLY Tractor Mode Jiggle Test

There are several videos on this problem with 2005 Chevrolet Duramax LLY engine fuel injector connectors. Sometimes you can't always believe what the OBD2 is indicating. The "jiggle" test is a snippet from one of the video searches I discovered and based this video on this solution.

[@ronaldnielson8591]

Circuit/System Description
The engine control module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. The ECM energizes each fuel injector by grounding the control circuit of that fuel injector. The ECM monitors the status of the injector positive voltage control circuits and the fuel injector control circuits. The injectors are separated into the following four groups:
Group 1-DTC P2146 with injectors 1 and 4
Group 2-DTC P2149 with injectors 6 and 7
Group 3-DTC P2152 with injectors 2 and 5
Group 4-DTC P2155 with injectors 3 and 8