Engine-Codes - Buick - P1404 BUICK

P1404 BUICK - Exhaust Gas Recirculation Closed Position Performance

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1404 BUICK Possible Causes

  • Carbon blockage of the pintle
  • Faulty Exhaust Gas Recirculation (EGR) valve

How is the P1404 BUICK code repair?

Start by checking 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.

Tech Notes

On some models, there is a service bulletin for the P1404 code that suggests reprogramming the Powertrain Control Module (PCM) to repair the problem.

What is the cost to diagnose the P1404 BUICK code

Labor: 1.0

The cost to diagnose the P1404 BUICK code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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When is the code detected?

While monitoring the Exhaust Gas Recirculation (EGR) valve pintle position the Powertrain Control Module (PCM) detected the closed position sensor voltage higher than the learned closed position voltage.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1404 BUICK Meaning

The Powertrain Control Module (PCM) determines that the EGR valve is stuck open if the actual Exhaust Gas Recirculation (EGR) position and the learned closed EGR position vary by more than a predetermined value. The PCM tests for a stuck valve when the desired EGR position is at 0%. The PCM commands the EGR valve to 100% during certain driving conditions in order to clear a possible restriction from the EGR valve if the PCM determines that the valve is stuck open. The PCM retests for a stuck valve when the desired EGR position returns to 0%. A failure timer increments if the stuck EGR valve condition is still present. This DTC sets when the timer reaches a predetermined value.

More Information

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