2012 W900 left brake light

[Truckdriven]

I have 2012 KW w900 that has no left turn/brake light. Tail works fine and all other lights on the truck, Has a fault code 237213. I checked wiring back to chassis node and all good, Used jumper to put 12 volt to wire terminal at chassis node plug and light comes on fine, checked voltage output at chassis node terminal and got 5.1 volts weather wire is plugged in not, when I turn the brake lights on through ESA simulator or with the brake pedal voltage will drop slightly to 4.8 volt. Checked all Chassis node power fuses and all good. Is my chassis node bad and needs replaced?