P047A Code: Meaning, Causes, and Symptoms | OBD2 Codes

P047A – Exhaust Pressure Sensor ‘B’ Circuit

 

P047A Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P047A Possible Causes

 

Faulty Exhaust Back Pressure Sensor ‘B’,Exhaust Back Pressure Sensor ‘B’ harness is open or shorted,Exhaust Back Pressure Sensor ‘B’ circuit poor electrical connection

 

P047A Description

 

The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure. The EBP sensor’s primary function is to measure exhaust back pressure so that the ECM can control the exhaust back pressure regulator (EPR) when needed.