AutoCodes – Buick – P1403 Buick

P1403 Buick Code - Exhaust Gas Recirculation System Valve 1

Quick Answer

The Powertrain Control Module (PCM) monitors the Exhaust Gas Recirculation (EGR) valve pintle position input to ensure that the valve responds properly to commands from the PCM. Common causes include Carbon blockage of the pintle, Faulty Exhaust Gas Recirculation (EGR) valve. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1403 Buick indicates Exhaust Gas Recirculation System Valve 1.
Common causes: Common causes include Carbon blockage of the pintle, Faulty Exhaust Gas Recirculation (EGR) valve.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 3,520

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1403 Buick Description

The Powertrain Control Module (PCM) monitors the Exhaust Gas Recirculation (EGR) valve pintle position input to ensure that the valve responds properly to commands from the PCM. When the ignition switch is turned ON, the PCM learns the EGR learned minimum position. The PCM compares the EGR learned minimum position to the EGR position sensor when the EGR valve is commanded closed.

OBDII Code P1403 Buick - Exhaust Gas Recirculation System Valve 1 - AutoCodes.com — P1403 Buick Code - Exhaust Gas Recirculation System Valve 1

What does this mean?

What are the Possible Causes of the DTC P1403 Buick?

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

How to Fix the DTC P1403 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1403 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.