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Engine-Codes – Infiniti – P0021 2003 Infiniti I35

P0021 2003 Infiniti I35 Code - Intake Valve Timing Control Performance Bank 2

Quick Answer

The P0021 code for a 2003 Infiniti I35 indicates a problem with the Intake Valve Timing Control Performance on Bank 2. Common causes include Faulty intake valve timing control solenoid, Defective camshaft position sensor, Issues with the camshaft phaser. 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 2003 Infiniti I35 indicates Intake Valve Timing Control Performance Bank 2.
Common causes
Common causes include Faulty intake valve timing control solenoid, Defective camshaft position sensor, Issues with the camshaft phaser.
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 10, 2024
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Code P0021 2003 Infiniti I35 Description

The P0021 code for a 2003 Infiniti I35 indicates a problem with the Intake Valve Timing Control Performance on Bank 2. This means that there is a malfunction in the system that controls the timing of the intake valves on the second bank of cylinders in the engine. The intake valve timing control system is crucial for the engine's performance and efficiency, as it determines when the intake valves open and close in relation to the engine's operation.

OBDII Code P0021 2003 Infiniti I35 - Intake Valve Timing Control Performance Bank 2
P0021 2003 Infiniti I35 Code - Intake Valve Timing Control Performance Bank 2

Common Causes of P0021 2003 Infiniti I35

  1. Faulty intake valve timing control solenoid
  2. Defective camshaft position sensor
  3. Issues with the camshaft phaser
  4. Timing chain wear or stretch
  5. Electrical problems within the intake valve timing control system

Symptoms of P0021 2003 Infiniti I35

  1. Reduced engine power
  2. Rough idling
  3. Hesitation or stalling during acceleration
  4. Decreased fuel efficiency
  5. Engine misfires

How to Fix P0021 2003 Infiniti I35

  1. Diagnose the specific cause of the issue using a scan tool to pinpoint the faulty component.
  2. Replace the faulty intake valve timing control solenoid, camshaft position sensor, camshaft phaser, or timing chain as needed.
  3. Inspect and repair any damaged wiring or connections in the intake valve timing control system.
  4. Clear the fault code and test drive the vehicle to ensure the issue has been resolved.
  5. Perform a relearn procedure if necessary to recalibrate the intake valve timing control system.

Cost to Fix P0021 2003 Infiniti I35

The typical repair costs for resolving a P0021 code on a 2003 Infiniti I35 can range from $200 to $800, depending on the specific cause of the issue and the cost of parts and labor. Keep in mind that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0021 2003 Infiniti I35

Since the Intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stuck open or close. Before replacing the valve, change the engine oil and filter and reset the engine code. If the code comes back you can remove the Intake valve timing control solenoid and clean it with brake cleaner.



















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When is the Code Detected?

When there is a gap between angle of target and phase-control angle degree, the valve will stop working and the ECM will trigger the P0021 code.

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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 2003 Infiniti I35 Code

1. What are the common symptoms of OBDII code P0021 on a 2003 Infiniti I35?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and a loss of power while driving.

2. What causes the OBDII code P0021 to appear on a 2003 Infiniti I35?

- The code P0021 is typically triggered by a faulty intake valve timing control solenoid, a malfunctioning variable valve timing (VVT) system, or issues with the engine's timing chain.

3. How can I diagnose the cause of OBDII code P0021 on my 2003 Infiniti I35?

- Diagnosing this code may involve checking the intake valve timing control solenoid, inspecting the VVT system, and examining the timing chain for any signs of wear or damage.

4. Can driving with OBDII code P0021 on a 2003 Infiniti I35 cause further damage to the engine?

- Continuing to drive with this code may lead to potential engine damage, reduced performance, and increased fuel consumption. It's recommended to address the issue promptly.

5. What are some repair tips for fixing OBDII code P0021 on a 2003 Infiniti I35?

- Repair options may include replacing the intake valve timing control solenoid, repairing or replacing the VVT system components, or addressing any issues with the timing chain.

6. Is it safe to continue driving my 2003 Infiniti I35 with the OBDII code P0021 without immediate repair?

- It is not recommended to drive the vehicle with this code present, as it can lead to further engine issues and potentially costly repairs down the line.

7. How much does it typically cost to repair OBDII code P0021 on a 2003 Infiniti I35?

- The cost of repairing this code can vary depending on the exact cause of the issue and the labor rates in your area. It's advisable to consult with a mechanic for an accurate estimate.

8. Can resetting the OBDII code P0021 on a 2003 Infiniti I35 temporarily fix the issue?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to reappear after some driving cycles.

9. Are there any preventive maintenance steps I can take to avoid OBDII code P0021 on my 2003 Infiniti I35 in the future?

- Regularly servicing your vehicle, following the manufacturer's recommended maintenance schedule, and using high-quality engine oil can help prevent issues that may trigger this code.

10. How long does it typically take to repair OBDII code P0021 on a 2003 Infiniti I35?

- The repair time can vary depending on the specific cause of the code and the extent of the damage. It's best to consult with a mechanic for a more accurate timeframe.

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