P047C Exhaust Pressure Sensor B Circuit Low

The exhaust pressure sensor measures the pressure ahead of the turbine or in the manifold (Ford: turbine upstream pressure, Cummins: exhaust manifold pressure, older Ford diesels: EBP). The module uses it to calculate EGR flow, to control the variable turbine and engine braking, and to protect against overpressure. No manufacturer document available to us uses sensor B – it would be a second sensor, for example on bank 2 of a twin-turbo engine; the description mirrors sensor A. P047C means the signal voltage of sensor B is below its limit (for sensor A Ford uses 0.1 V or 0.21 V).

Likely causes

Symptoms

• Check engine light on
• EGR and turbo control on a substitute value, possibly reduced power
• Exhaust brake or warm-up flap without function

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, fordservicecontent.com.