This if for ONE 1946723 Sensor Gp Boost Pressure . Changes in performance are made by installing different software in Electronic Control Module (ECM) (18) . Make an Offer. This parameter is in the "Emissions Parameters". The approximate same value readings will occur while the engine is not running. I was getting check/stop engine light about six months ago. Diagnostics Exist that Require J1939 Service Tool Connection. Term that I am going to go with boost pressure sensor which is part of group of 5 volt sensors. This code indicates that Cat ET is not communicating on the J1939 data link. The personality module is a permanent part of the ECM. Wheel-Based Vehicle Speed : High - Most Severe (3), Wheel-Based Vehicle Speed : Erratic, Intermittent, or Incorrect, Wheel-Based Vehicle Speed : Abnormal Frequency, Pulse Width, or Period, Wheel-Based Vehicle Speed : Abnormal Rate of Change, Wheel-Based Vehicle Speed : Special Instruction, Accelerator Pedal Position 1 : Abnormal Frequency, Pulse Width, or Period, Troubleshooting, "Sensor Signal (PWM) - Test", Accelerator Pedal Position 1 : Calibration Required, Engine Oil Pressure : Low - Most Severe (3), Engine Oil Pressure : Voltage Above Normal, Troubleshooting, "Sensor Signal (Analog, Active) - Test", Engine Oil Pressure : Voltage Below Normal, Engine Oil Pressure : Abnormal Rate of Change, Engine Oil Pressure : Low - Least Severe (1), Engine Crankcase Pressure : Voltage Above Normal, Engine Crankcase Pressure : Voltage Below Normal, Engine Crankcase Pressure : High - Least Severe (1), Troubleshooting, "Crankcase Pressure Is High", Engine Crankcase Pressure : High - Moderate Severity (2), Engine Crankcase Pressure : Low - Moderate Severity (2), Troubleshooting, "Crankcase Pressure Is Low", Engine Intake Manifold #1 Pressure : Voltage Above Normal, Engine Intake Manifold #1 Pressure : Voltage Below Normal, Engine Intake Manifold #1 Pressure : Abnormal Rate of Change, Engine Intake Manifold #1 Pressure : Low - Moderate Severity (2), Troubleshooting, "Intake Manifold Air Pressure Is Low", Engine Turbocharger 1 Speed : Abnormal Frequency, Pulse Width, or Period, Engine Turbocharger 1 Speed : High - Moderate Severity (2), Engine Intake Manifold 1 Temperature : Voltage Above Normal, Troubleshooting, "Sensor Signal (Analog, Passive) - Test", Engine Intake Manifold 1 Temperature : Voltage Below Normal, Engine Intake Manifold 1 Temperature : High - Least Severe (1), Troubleshooting, "Intake Manifold Air Temperature Is High", Engine Intake Manifold 1 Temperature : High - Moderate Severity (2), Engine Coolant Temperature : Voltage Above Normal, Engine Coolant Temperature : Voltage Below Normal, Engine Coolant Temperature : High - Least Severe (1), Troubleshooting, "Coolant Temperature Is High", Engine Coolant Temperature : High - Moderate Severity (2), Engine Coolant Level : Low - Most Severe (3), Engine Coolant Level : Erratic, Intermittent, or Incorrect, Engine Coolant Level : Voltage Above Normal, Engine Coolant Level : Voltage Below Normal, Engine Coolant Level : Low - Least Severe (1), Engine Injector Metering Rail 1 Pressure : Voltage Above Normal, Engine Injector Metering Rail 1 Pressure : Voltage Below Normal, Engine Injector Metering Rail 1 Pressure : Not Responding Properly, Troubleshooting, "Fuel Rail Pressure Problem", Engine Injector Metering Rail 1 Pressure : High - Least Severe (1), Engine Injector Metering Rail 1 Pressure : Low - Least Severe (1), Troubleshooting, "Fuel System Pressure - Test", Battery Potential (Voltage) Switched : Erratic, Intermittent, or Incorrect, Troubleshooting, "Electrical Power Supply - Test", Electrical Potential (Voltage) : Erratic, Intermittent, or Incorrect, Electrical Potential (Voltage) : Voltage Above Normal, Electrical Potential (Voltage) : Voltage Below Normal, Ambient Air Temperature : Voltage Above Normal, Ambient Air Temperature : Voltage Below Normal, Ambient Air Temperature : Abnormal Update Rate, Ambient Air Temperature : Other Failure Mode, Engine Air Inlet Temperature : Erratic, Intermittent, or Incorrect, Engine Air Inlet Temperature : Voltage Above Normal, Engine Air Inlet Temperature : Voltage Below Normal, Engine Speed : Abnormal Frequency, Pulse Width, or Period. 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