AutoCodes – Hyundai – P1159 Hyundai

P1159 Hyundai Code - Variable Intake Motor Malfunction

Quick Answer

Variable Intake System (VIS) is used to increase torque at lower rpm and increase horsepower at higher rpm. Common causes include Faulty Variable Intake Motor, Variable Intake Motor harness is open or shorted, Variable Intake Motor 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: P1159 Hyundai indicates Variable Intake Motor Malfunction.
Common causes: Common causes include Faulty Variable Intake Motor, Variable Intake Motor harness is open or shorted, Variable Intake Motor 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 26,085

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 03, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1159 Hyundai Description

Variable Intake System (VIS) is used to increase torque at lower rpm and increase horsepower at higher rpm. Sigma 3.5â„“ engine has two intake runners for each cylinder. The primary intake runner is a long, thin tube in which the intake air passes through. This allows a strong stream of air to blast into the cylinder, helping low-end torque. The secondary intake runner is a short, fat tube. This allows a large volume of air to be sucked into the engine, increasing high-end horsepower. At lower rpm range, the engine does not provide enough suction into the cylinders, starving the engine of much needed oxygen. The skinny tube helps blast the air into the cylinder for more oxygen. At higher rpm, the engine has plenty of suction but the intake runner is too small to provide the oxygen it needs.

OBDII Code P1159 Hyundai - Variable Intake Motor Malfunction - AutoCodes.com — P1159 Hyundai Code - Variable Intake Motor Malfunction

What does this mean?

What are the Possible Causes of the DTC P1159 Hyundai?

Faulty Variable Intake Motor
Variable Intake Motor harness is open or shorted
Variable Intake Motor circuit poor electrical connection

How to Fix the DTC P1159 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 P1159 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.

Frequently Asked Questions about P1159 Hyundai Code

1. What are the common symptoms of OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction?

- Common symptoms include rough idling, decreased engine performance, and the Check Engine light being illuminated.

2. What are the possible causes of OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction?

- The code P1159 in Hyundai vehicles is typically caused by a faulty variable intake motor or a problem with the intake manifold runner control (IMRC) system.

3. How can I diagnose the Variable Intake Motor Malfunction (P1159) in my Hyundai?

- Diagnosing this issue usually involves performing a thorough inspection of the intake motor, checking for any loose connections, and using a scan tool to read the fault codes stored in the vehicle's computer.

4. Can I drive my Hyundai with OBDII code P1159 - Variable Intake Motor Malfunction?

- It is not recommended to drive your Hyundai with this code present, as it can lead to further engine damage and poorer performance. It's best to address the issue promptly.

5. How can I repair OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction?

- Repairing this issue often involves replacing the faulty variable intake motor or repairing any damaged wiring or connections in the IMRC system.

6. Can I reset the OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction on my own?

- You can reset the code using an OBDII scanner, but it is important to address the underlying issue causing the code before resetting it to prevent it from reoccurring.

7. Are there any tips to prevent OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction?

- Regular maintenance of your vehicle, including checking and cleaning the intake system, can help prevent issues that may trigger this code.

8. How much does it cost to repair OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction?

- The cost of repairing this code can vary depending on the extent of the damage and the specific parts that need replacement. It is advisable to consult a professional mechanic for an accurate estimate.

9. Will OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction affect my vehicle's fuel efficiency?

- Yes, this code can lead to decreased fuel efficiency due to the engine running inefficiently. Addressing the issue promptly can help improve fuel economy.

10. Can a DIY enthusiast repair OBDII code P1159 (Hyundai) - Variable Intake Motor Malfunction?

- While some DIY enthusiasts may be able to tackle this repair, it is recommended to consult a professional mechanic, especially if you are not experienced with engine components and diagnostic tools.