AutoCodes - Saturn - P0401 SATURN

P0401 SATURN Code - Exhaust Gas Recirculation Flow Insufficient

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3
Table of contents

|P0401 SATURN code possible causes

  • EGR passage clogged
  • Faulty EGR Valve
  • EGR solenoid valve harness is open or shorted
  • EGR solenoid valve circuit poor electrical connection

|How do I fix the P0401 SATURN code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0401 SATURN code tech notes

EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages.

|Cost of diagnosing the P0401 SATURN code

Labor: 1.0

The cost of diagnosing the P0401 SATURN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0401 SATURN code detected?

The Powertrain Control Module (PCM) sets a DTC P0401 when the fail counter exceeds the fail threshold. The number of test samples required to exceed the fail threshold varies according to the magnitude of the detected flow errors.

|What are P0401 SATURN code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible engine hesitation

|P0401 SATURN code description

The Powertrain Control Module (PCM) tests the EGR system during deceleration by momentarily commanding the EGR valve open. The pressure in the intake manifold increases when the EGR valve is open. The PCM monitors the Manifold Absolute Pressure (MAP) sensor signal during the EGR system diagnostic in order to determine the amount of EGR flow. The PCM calculates an error based on the difference between the actual MAP increase and a predetermined value. The PCM records the error and adjusts an internal fail counter towards the fail threshold if the error is too great.
OBDII Code P0401 Saturn - Exhaust Gas Recirculation Flow Insufficient -

|Need more information with the P0401 SATURN code?

Need more information on how to fix the P0401 SATURN code? Get Access to Factory Service Manuals

|Need help with a P0401 SATURN code?

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|P0401 SATURN code comments

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