AutoCodes – Hyundai – P0391 Hyundai

P0391 Hyundai Code - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2

Quick Answer

The Camshaft Position Sensor (CMPS) is a sensor that detects the compression Top Dead Center (TDC) of the NO. Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position 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: P0391 Hyundai indicates Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2.
Common causes: Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position 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 13,025

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0391 Hyundai Description

The Camshaft Position Sensor (CMPS) is a sensor that detects the compression Top Dead Center (TDC) of the NO. 1 cylinder. The CMPS consists of a hall type sensor and a target on the end of the intake camshaft. When the target triggers the sensor, the sensor voltage is 5V. If not, the sensor voltage is 0V. These CMPS signal is sent to the Engine Control Module (ECM) and the ECM uses the CMPS signal for synchronizing the firing of sequential fuel injectors.

OBDII Code P0391 Hyundai - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2 - AutoCodes.com — P0391 Hyundai Code - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2

What does this mean?

What are the Possible Causes of the DTC P0391 Hyundai?

Faulty Camshaft Position Sensor
Camshaft Position Sensor harness is open or shorted
Camshaft Position Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0391 Hyundai?

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 P0391 Hyundai 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.