P1411: DPFE Sensor Upstream Hose Fault
Code P1411 indicates that the powertrain control module (PCM) has detected an issue in the DPFE (Differential Pressure Feedback EGR) sensor circuit or reading, specifically a disconnected or blocked upstream pressure hose. The DPFE sensor monitors exhaust gas pressure drop across a calibrated orifice in the EGR tube to verify actual EGR flow. The upstream hose measures pressure before the orifice; if it is disconnected or clogged, the sensor reports zero or incorrect pressure difference. When the PCM sees that the pressure reading does not change as expected with EGR valve operation, it stores this manufacturer-specific fault code.
01. Most Common Causes
- Upstream DPFE sensor hose disconnected, broken, or cracked
- Upstream hose clogged with carbon buildup
- EGR tube or plenum pressure ports blocked with soot
- DPFE sensor internally damaged
- Downstream hose mistakenly connected to the upstream port
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Possible failed emissions test
- Reduced fuel economy
03. Step-by-Step Diagnosis
Inspect the DPFE sensor hoses for disconnection, cracks, or carbon blockage; clean or replace as needed.
Check the EGR tube pressure ports for soot buildup and clean them.
Test the DPFE sensor voltage output with a scan tool or multimeter while commanding EGR operation.
If hoses and ports are clear but sensor readings are off, replace the DPFE sensor.
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the vehicle may have reduced performance and fail an emissions test. It's best to repair it soon to avoid further issues.
How much does it cost to fix?▼
Typically $100 to $300, depending on whether it's just a hose replacement or a new DPFE sensor.