P1401 Code: DPFE Circuit High Input
🟠 Moderate severity · drivable
Drivable, but the engine may idle rough, hesitate, or run poorly because the EGR system isn't working right.
What P1401 means
The DPFE (differential pressure feedback EGR) sensor measures exhaust gas flow through the EGR system and reports it to the computer. This code means the sensor's signal voltage is too high, so the computer can't control exhaust gas recirculation correctly, which can hurt idle quality and acceleration.
Symptoms
- Check engine light is on
- Rough or unstable idle
- Hesitation during acceleration
- Engine stalling at stops
- Failed emissions test
Common causes
- most common: Faulty DPFE sensor
- common: Clogged or damaged DPFE hoses
- common: Carbon buildup blocking EGR passages
- less common: Damaged sensor wiring or connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean or replace the DPFE sensor | Yes | $40–120 |
| Clean the DPFE hoses and EGR passages | Yes | $0–50 |
| Replace the EGR valve if it is stuck or clogged | Mechanic | $150–400 |
Frequently asked questions
Can I drive with a P1401 code?
Yes, but the engine may idle rough or hesitate. It's safe for short trips, but get the EGR system fixed soon.
What is the DPFE sensor?
It measures the pressure difference across the EGR system so the computer knows how much exhaust gas is flowing back into the engine.
How much does it cost to fix P1401?
A new DPFE sensor is $40–$120 and is a common DIY fix. An EGR valve replacement runs $150–$400.
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Updated 2026-08. This page is informational and not a substitute for professional diagnosis.