What Does P1401 Mean?
The Differential Pressure Feedback Electronic (DPFE) sensor is reporting a voltage signal that exceeds the normal operating range. This sensor monitors EGR system flow by measuring pressure differential across the EGR orifice.
Common Causes
50%
Failed DPFE sensor with internal circuit fault
20%
Open circuit or damaged wiring in DPFE sensor signal circuit
15%
Corroded or loose sensor connector pins
10%
Clogged or restricted DPFE sensor hoses causing pressure spikes
5%
ECM internal fault in DPFE sensor monitoring circuit
Diagnostic Steps
1
Step 1: Monitor DPFE sensor voltage at idle and under load (typically 0.5-4.5V range)
2
Step 2: Inspect DPFE sensor connector for corrosion, moisture, or damaged terminals
3
Step 3: Check DPFE sensor hoses for proper connection, blockage, or damage
4
Step 4: Test sensor signal voltage at ECM connector to rule out wiring issues
5
Step 5: Apply vacuum or pressure to sensor ports and verify voltage response changes appropriately
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The Differential Pressure Feedback Electronic (DPFE) sensor is reporting a voltage signal that exceeds the normal operating range. This sensor monitors EGR system flow by measuring pressure differential across the EGR orifice.
The most common cause of P1401 (Differential Pressure Feedback Electronic Sensor circuit High Voltage) is: Failed DPFE sensor with internal circuit fault
Typical repair costs for P1401 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience rough idle, hesitation, or reduced fuel economy. Will likely fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1401 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System (EGR)
Difficulty
Type
Manufacturer
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