Exhaust Pressure Sensor Circuit High
The P047D code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust pressure sensor that is higher than the expected range. This sensor monitors backpressure in the exhaust system, often related to the diesel particulate filter (DPF) or turbocharger. A high circuit condition can be caused by a faulty sensor, wiring issues, or actual high exhaust pressure due to a restricted exhaust.
01. Most Common Causes
- Faulty exhaust pressure sensor
- Short to voltage in sensor wiring
- Corroded or damaged connector
- High exhaust backpressure (clogged DPF or catalytic converter)
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine performance
- Poor fuel economy
- Possible regeneration issues (DPF)
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the exhaust pressure sensor and wiring for damage or corrosion.
Step 3: Test sensor voltage signal with a multimeter; compare to manufacturer specs.
Step 4: Check for exhaust restrictions by measuring backpressure with a gauge.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as high exhaust backpressure can cause engine damage or DPF failure. Have it diagnosed promptly.
How much does it cost to fix?▼
Replacing the exhaust pressure sensor typically costs $50-$150 including parts and labor. Additional repairs for exhaust restrictions may cost more.