AutoCodes – Cadillac – P1399 Cadillac

P1399 Cadillac Code - Wheel Speed Sensor 2 G-Sensor Circuit Intermittent

Quick Answer

The Engine Control Module (ECM) monitors the Wheel Speed Sensor 2 G-Sensor. 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: P1399 Cadillac indicates Wheel Speed Sensor 2 G-Sensor Circuit Intermittent.
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 3,555

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 Sep 29, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
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Code P1399 Cadillac Description

The Engine Control Module (ECM) monitors the Wheel Speed Sensor 2 G-Sensor. The ECM sets the Diagnostic Trouble Code (DTC) when the Wheel Speed Sensor 2 G-Sensor is not to factory specifications.

OBDII Code P1399 Cadillac - Wheel Speed Sensor 2 G-Sensor Circuit Intermittent - AutoCodes.com — P1399 Cadillac Code - Wheel Speed Sensor 2 G-Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P1399 Cadillac?

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

How to Fix the DTC P1399 Cadillac?

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 P1399 Cadillac 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.