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 back pressure in the exhaust system, often used for EGR or turbocharger control. An intermittent fault can be caused by wiring issues, poor connections, or a failing sensor, leading to incorrect readings and potential performance problems.
1. Most Common Causes
- Faulty exhaust pressure sensor
- Damaged or corroded wiring/connectors
- Loose or intermittent electrical connection
- Exhaust system leaks or blockages
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Poor fuel economy
- Rough idle or hesitation
3. 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: Check sensor connector for tightness and clean if necessary.
Step 4: Use a multimeter to test sensor signal voltage and compare to specifications.
Step 5: If wiring and connections are good, replace the exhaust pressure sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive for extended periods as it can cause reduced performance and fuel economy, and may lead to further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.