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P0021 Hyundai Code - 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2

Quick Answer

The P0021 Hyundai diagnostic trouble code (DTC) indicates that the 'A' Camshaft Position Timing is over-advanced or that there is a system performance issue in Bank 2 of the vehicle's engine. Common causes include Faulty Camshaft Position Sensor: A malfunctioning camshaft position sensor can send incorrect signals to the engine control module (ECM), leading to timing issues, Camshaft Phaser Problems: Issues with the camshaft phaser, such as wear or damage, can affect the camshaft timing and trigger the P0021 code, VVT Solenoid Malfunction: A faulty variable valve timing (VVT) solenoid can impact the timing of the camshaft, causing performance issues. 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
P0021 Hyundai indicates 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2.
Common causes
Common causes include Faulty Camshaft Position Sensor: A malfunctioning camshaft position sensor can send incorrect signals to the engine control module (ECM), leading to timing issues, Camshaft Phaser Problems: Issues with the camshaft phaser, such as wear or damage, can affect the camshaft timing and trigger the P0021 code, VVT Solenoid Malfunction: A faulty variable valve timing (VVT) solenoid can impact the timing of the camshaft, causing performance issues.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0021 Hyundai Description

The P0021 Hyundai diagnostic trouble code (DTC) indicates that the 'A' Camshaft Position Timing is over-advanced or that there is a system performance issue in Bank 2 of the vehicle's engine. This code is typically seen in vehicles with variable valve timing (VVT) systems, which are designed to optimize engine performance and fuel efficiency by adjusting the timing of the opening and closing of the intake and exhaust valves.

OBDII Code P0021 Hyundai - 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2
P0021 Hyundai Code - 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2

Common Causes of P0021 Hyundai

  1. Faulty Camshaft Position Sensor: A malfunctioning camshaft position sensor can send incorrect signals to the engine control module (ECM), leading to timing issues.
  2. Camshaft Phaser Problems: Issues with the camshaft phaser, such as wear or damage, can affect the camshaft timing and trigger the P0021 code.
  3. VVT Solenoid Malfunction: A faulty variable valve timing (VVT) solenoid can impact the timing of the camshaft, causing performance issues.
  4. Timing Chain/Belt Issues: Wear or slack in the timing chain or belt can result in improper camshaft timing, leading to the code being triggered.
  5. Low Engine Oil Levels/Quality: Insufficient or poor-quality engine oil can impact the operation of the VVT system, leading to timing errors and the P0021 code.

Symptoms of P0021 Hyundai

  1. Check Engine Light: The most common symptom associated with the P0021 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Rough Idle: The engine may experience rough idling or stalling, especially at low speeds or when coming to a stop.
  3. Decreased Fuel Efficiency: The vehicle may consume more fuel than usual due to the incorrect camshaft timing affecting engine performance.
  4. Loss of Power: The engine may lack power or responsiveness during acceleration, making it feel sluggish or underpowered.
  5. Engine Misfires: The engine may exhibit misfires, which can cause rough running and potentially lead to further engine damage if not addressed promptly.

How to Fix P0021 Hyundai

  1. Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the camshaft position sensor, VVT solenoid, timing chain/belt, and other related components.
  2. Replace Faulty Components: Replace any faulty components identified during the diagnosis, such as the camshaft position sensor, VVT solenoid, or camshaft phaser.
  3. Check Engine Oil: Ensure that the engine oil level is correct and of good quality, as low or degraded oil can impact the VVT system's operation.
  4. Clear DTCs: Clear the DTCs from the ECM memory using a scan tool after completing the repairs to reset the check engine light.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the engine is running smoothly with the correct camshaft timing.

Cost to Fix P0021 Hyundai

The cost of repairing a P0021 Hyundai DTC can vary depending on the specific cause of the issue and the parts and labor required for the repair. Typically, the cost of parts such as a camshaft position sensor, VVT solenoid, or camshaft phaser can range from $50 to $200 each, depending on the vehicle's make and model.

What does this mean?

Tech Notes for P0021 Hyundai

There is a factory service bulletin for the following Hyundai models:



Hyundai Accent (MC)

Hyundai 2003-2006 SULEV Elantra (XD)

Hyundai 2004-2008 Tiburon 2.0L (GK)

Hyundai Tucson 2.0L (JM)

Hyundai Elantra (HD)

Hyundai Elantra Touring (FD)

Hyundai Genesis Coupe (BK)

Hyundai Sonata (NF)

Hyundai Santa Fe

Hyundai Sonata (NF)

Hyundai Santa Fe (CM)

Hyundai Azera (TG)

Hyundai Veracruz (EN)

Hyundai Entourage (EP),

Hyundai Genesis Coupe (BK)

Hyundai Genesis Sedan (BH)Genesis Sedan (BH)



The bulletin provides information on how to inspect and diagnose problems related to the Oil Control Valve (OCV) used in Constant Variable Valve Timing (CVVT), if at any time the OCV is suspected as the caused of rough idling, poor acceleration, camshaft timing misalignment-related trouble codes, misfire-related trouble codes.



Factory Service Bulletin: Hyundai Constant Variable Valve Timing Oil Control Valve Inspection OBDII Code P0021

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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 P0021 Hyundai Code

1. What are the common symptoms of OBDII code P0021 on a Hyundai?

- Common symptoms include rough idling, loss of power, poor acceleration, engine knocking, and possible stalling.

2. What does the OBDII code P0021 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2 mean for a Hyundai?

- This code indicates that the camshaft position on bank 2 is over-advanced or performing poorly, affecting the engine's timing.

3. What are the potential causes of OBDII code P0021 on a Hyundai?

- Possible causes include a faulty camshaft position sensor, issues with the camshaft phaser, timing chain problems, oil flow issues, or engine control module malfunctions.

4. How can I diagnose the OBDII code P0021 on my Hyundai?

- Diagnosis may involve checking the camshaft position sensor, inspecting the timing chain, testing the oil pressure, and scanning the engine control module for any related fault codes.

5. Can I drive my Hyundai with OBDII code P0021?

- It is not recommended to drive your Hyundai with this code as it can lead to further engine damage and potential safety risks due to poor performance.

6. How can I repair OBDII code P0021 on my Hyundai?

- Repair options may include replacing the camshaft position sensor, fixing timing chain issues, ensuring proper oil flow, and resetting the engine control module.

7. What are the long-term effects of ignoring OBDII code P0021 on a Hyundai?

- Ignoring this code can lead to severe engine damage, reduced fuel efficiency, increased emissions, and potential engine failure if left unresolved.

8. Are there any preventive maintenance tips to avoid OBDII code P0021 on my Hyundai?

- Regularly scheduled maintenance, including timely oil changes, checking for engine leaks, and following the manufacturer's recommended service intervals, can help prevent issues that trigger this code.

9. Can a DIY enthusiast fix OBDII code P0021 on a Hyundai?

- Depending on the level of expertise, some DIY enthusiasts may be able to address simpler causes of this code, such as replacing the camshaft position sensor. However, more complex issues may require professional assistance.

10. How much does it typically cost to repair OBDII code P0021 on a Hyundai?

- Repair costs for this code can vary depending on the exact cause of the issue, but expenses may range from $200 to $800 or more, including parts and labor.

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