For Shop Owners

P1404 BUICK - Exhaust Gas Recirculation Closed Position Performance

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?
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Possible causes

  • Carbon blockage of the pintle
  • Faulty Exhaust Gas Recirculation (EGR) valve
What does this mean?

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 does this mean?

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 Description

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.
OBDII Code P1404 Buick - Exhaust Gas Recirculation Closed Position Performance -

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P1404 BUICK Comments

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Repair Importance Level: 2
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Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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