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OBD Code P1401

DPFE Circuit High Input

CodeP1401
DescriptionDPFE Circuit High Input
SystemEmissions

What Does P1401 Mean?

DPFE Circuit High Input. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the emissions.

Code Breakdown

P = Powertrain code

1 = Manufacturer-specific

How to Fix P1401

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check DEF (Diesel Exhaust Fluid) level and quality — refill with fresh DEF if low.
  2. Inspect the DPF (Diesel Particulate Filter) for excessive soot loading.
  3. Perform a forced DPF regeneration using a scan tool if soot loading is high.
  4. Check the SCR (Selective Catalytic Reduction) system for proper function.
  5. Inspect the NOx sensor readings.
  6. Check the EGR system for proper operation.
  7. Clear codes and perform a highway drive cycle to allow passive regeneration.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P1401 serious?

Yes — P1401 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear P1401 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P1401?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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