AutoCodes – Buick – P1391 Buick

P1391 Buick Code - Wheel Speed Sensor 1 G-Sensor Circuit Performance

Quick Answer

P1391 Buick indicates Wheel Speed Sensor 1 G-Sensor Circuit Performance. Common causes include Faulty G-Sensor, G-Sensor harness is open or shorted, G-Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1391 Buick indicates Wheel Speed Sensor 1 G-Sensor Circuit Performance.
Common causes: Common causes include Faulty G-Sensor, G-Sensor harness is open or shorted, G-Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,219

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 17, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
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Code P1391 Buick Description

OBDII Code P1391 Buick - Wheel Speed Sensor 1 G-Sensor Circuit Performance - AutoCodes.com — P1391 Buick Code - Wheel Speed Sensor 1 G-Sensor Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1391 Buick?

Faulty G-Sensor
G-Sensor harness is open or shorted
G-Sensor circuit poor electrical connection

How to Fix the DTC P1391 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 P1391 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.