Exhaust Pressure Sensor Circuit Intermittent/Erratic
The P047E code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal from the exhaust pressure sensor circuit. This sensor monitors backpressure in the exhaust system, often used for diesel particulate filter (DPF) regeneration and EGR control. An intermittent signal can be caused by wiring issues, loose connections, or a failing sensor, leading to incorrect exhaust pressure readings.
01. Most Common Causes
- Faulty exhaust pressure sensor
- Damaged or corroded wiring/connectors
- Loose electrical connection
- Exhaust system leaks affecting pressure readings
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Poor fuel economy
- Possible DPF regeneration issues
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the exhaust pressure sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and resistance with a multimeter per manufacturer specs.
Step 4: Check for exhaust leaks near the sensor mounting point.
Step 5: If wiring and sensor test OK, clear code and test drive to see if it returns.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause reduced performance and potential DPF issues. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for a new sensor plus labor, depending on vehicle make and model.