Genuine GM New Fuel Rail Pressure Sensor For 2011-2016 GM 6.6L LML. If you have a rough idle, poor fuel economy, and low power, this may be the fix.
This Rail Pressure Sensor has a Scale hieght of approx. 31,000psi. Its popular among high performance builders to put this sensor in place of their LLY or LBZ OE sensor. Your truck will need the tune edited to rescale the pressure readings.