P1401

Ford

DPFE Circuit High Input

Definition source: Manufacturer reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The DPFE sensor measures pressure difference in the EGR system so the PCM can assess EGR flow. P1401 means the PCM detected a signal that is higher than expected from the DPFE circuit. It identifies a circuit condition, not proof that the sensor or another specific part has failed. Depending on the underlying issue, the vehicle may run normally or have drivability or emissions problems.

Report an error with this code

⚠️ Before You Begin (Safety First)

This code alone does not usually mean the vehicle must be stopped immediately. Stop driving if the engine stalls, runs severely rough, loses power enough to make driving unsafe, or the check-engine light flashes. Address persistent drivability problems promptly.

Common Symptoms

  • The check-engine light may be on, with no noticeable change in how the vehicle runs.
  • Rough idle or stalling may occur if an underlying EGR-related problem affects engine operation.
  • Hesitation or reduced performance may occur, though P1401 alone does not establish that EGR flow is incorrect.
  • The vehicle may fail an emissions inspection if the fault affects emissions readiness or operation.

Common Causes

  • A DPFE sensor may produce an incorrect high signal because of an internal electrical fault.
  • Damaged wiring or a connector problem may cause the signal circuit to read high.
  • A circuit ground or other electrical connection problem may affect the sensor signal.
  • A fault elsewhere in the circuit or, less commonly, in the PCM may be involved; confirm it with testing before considering PCM repair.
  • Damaged, disconnected, or obstructed DPFE pressure hoses may interfere with pressure measurement, although they do not by themselves prove an electrical high-input fault.

Diagnostic Steps

  1. Confirm P1401 with a scan tool and note any related codes; related faults can help distinguish a sensor-circuit issue from a broader EGR problem.
  2. With the engine off and cool, visually inspect accessible DPFE wiring and connectors for looseness, corrosion, chafing, or heat damage.
  3. Inspect accessible pressure hoses for disconnection, damage, blockage, or incorrect routing; do not assume a hose problem is the cause of a circuit-high code.
  4. If you have the correct vehicle-specific wiring information and suitable tools, check the circuit connections and scan data without piercing or damaging wiring.
  5. If the fault remains or electrical testing is unfamiliar, have a qualified technician test the circuit and DPFE response before replacing parts.

When to Call a Professional

Start by confirming the code and reviewing related codes and available scan data. Inspect the DPFE connector, wiring, and pressure hoses for damage or poor connections. Use model-, year-, and engine-specific wiring information to test the circuit's power, ground, and signal, then assess whether the DPFE signal responds appropriately during EGR operation. Consider a sensor replacement only after circuit and hose checks support that diagnosis.

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Commonly Asked Questions

Does P1401 prove the DPFE sensor is bad?

No. The code reports a high input in the DPFE circuit. Wiring, connector, ground, or other circuit problems can produce an incorrect signal, so test the circuit before replacing the sensor.

Does this code mean the EGR valve is stuck open?

Not by itself. P1401 identifies a high DPFE circuit input; it does not prove that the EGR valve is stuck or that EGR flow is too high.

Can I drive with P1401?

If the vehicle runs normally, the code alone does not usually require an immediate stop, but arrange diagnosis. Stop if it stalls, runs severely rough, loses substantial power, or the check-engine light flashes.

Should I replace the DPFE sensor first?

Not without checks. Inspect the connector, wiring, and pressure hoses, then test the circuit and sensor response using procedures for the exact model, year, and engine.

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