The P1401 trouble code points to an Exhaust Gas Recirculation (EGR) boost sensor circuit malfunction. This guide explains its meaning, signs, root causes, and repair methods, plus how the iCarzone UR1000 scanner can help.

What Does the P1401 Code Mean?

The P1401 code is triggered when your vehicle’s Powertrain Control Module (PCM) detects a problem with the EGR boost sensor circuit. This sensor monitors the pressure in the EGR system to ensure exhaust gases are recirculating correctly for emissions control. When the signal from the boost sensor is out of the expected range, the PCM sets the P1401 code and usually illuminates the Check Engine Light.

Common Symptoms of P1401

• Check Engine Light (CEL) is on
• Rough idling or engine misfire
• Reduced engine performance
• Increased fuel consumption
• Failed emissions test

Possible Causes of P1401

• Faulty EGR boost pressure sensor
• Wiring issues (shorts, opens, or corrosion)
• Clogged or carbon-blocked EGR passages
• Defective EGR valve
• PCM software or hardware malfunction

Step-by-Step Diagnosis

1. Use an OBD2 scanner like the iCarzone UR1000 to read and confirm the P1401 code.
2. Check the EGR boost sensor wiring for damage or loose connections.
3. Inspect the EGR valve and passages for carbon build-up.
4. Test the sensor voltage and resistance against manufacturer specs.
5. Clear the code and test drive to confirm if the issue reappears.

Repair & Fix Guide

Repairs for P1401 depend on the root cause:

• Replace the faulty EGR boost sensor
• Repair or replace damaged wiring/connectors
• Clean carbon build-up in the EGR valve and passages
• Update or reflash PCM software if needed

The iCarzone UR1000 makes troubleshooting easier by providing live sensor data, enabling you to confirm repairs instantly.

Frequently Asked Questions