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. P047A is the general circuit fault of sensor B, comparable to P0470 for sensor A (a sensor error status or raw values out of limits).
Medium severity. Can I keep driving?You can usually keep driving in the short term. If you smell exhaust fumes in the cabin, stop driving and ventilate the car.
Symptoms
- Check engine light on
- EGR and turbo control on a substitute value, possibly reduced power
- Exhaust brake or warm-up flap without function
Most likely causes
- Sensor faulty internally
- Connector corroded or heat-damaged near the manifold
- Broken or chafed signal or 5 V wire
- Engine module or software
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P047A means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 4: Emissions
- 7A: Specific fault in that system
Frequently asked questions
Can I keep driving with code P047A?
You can usually keep driving in the short term. If you smell exhaust fumes in the cabin, stop driving and ventilate the car.
What causes code P047A?
The most common causes are: sensor faulty internally; connector corroded or heat-damaged near the manifold; broken or chafed signal or 5 V wire.
Related codes
- P0470Exhaust Pressure Sensor A Circuit
- P047BExhaust Pressure Sensor B Circuit Range/Performance
- P047CExhaust Pressure Sensor B Circuit Low
- P047DExhaust Pressure Sensor B Circuit High
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.