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Engine-Codes – Scion – P0021 Scion

P0021 Scion Code - Camshaft Position 'A' Timing Over-Advanced or System Performance Bank 2

Quick Answer

The P0021 Scion code indicates that the Engine Control Module (ECM) has detected that the camshaft position 'A' timing in bank 2 is over-advanced or that there is a performance issue within the system. Common causes include Faulty camshaft position sensor, Timing chain or belt issues, Problems with the variable valve timing (VVT) system. 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 Scion indicates Camshaft Position 'A' Timing Over-Advanced or System Performance Bank 2.
Common causes
Common causes include Faulty camshaft position sensor, Timing chain or belt issues, Problems with the variable valve timing (VVT) system.
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 Scion Description

The P0021 Scion code indicates that the Engine Control Module (ECM) has detected that the camshaft position 'A' timing in bank 2 is over-advanced or that there is a performance issue within the system. This means that the timing of the camshaft in relation to the crankshaft is not within the specified parameters set by the manufacturer. The camshaft position is crucial for the engine's proper operation as it controls the opening and closing of the valves. When the timing is over-advanced, it can lead to poor engine performance, reduced fuel efficiency, and potential damage to the engine components.

OBDII Code P0021 Scion - Camshaft Position 'A' Timing Over-Advanced or System Performance Bank 2
P0021 Scion Code - Camshaft Position 'A' Timing Over-Advanced or System Performance Bank 2

Common Causes of P0021 Scion

  1. Faulty camshaft position sensor
  2. Timing chain or belt issues
  3. Problems with the variable valve timing (VVT) system
  4. Malfunctioning ECM
  5. Oil flow issues to the VVT system

Symptoms of P0021 Scion

  1. Rough idling
  2. Engine misfires
  3. Hesitation during acceleration
  4. Decreased power output
  5. Stalling

How to Fix P0021 Scion

  1. Diagnose the specific cause of the code using a scan tool to pinpoint the issue accurately.
  2. Inspect the camshaft position sensor and replace it if faulty.
  3. Check the timing chain or belt for wear or damage and replace if necessary.
  4. Inspect the VVT system for any issues and repair or replace components as needed.
  5. Clear the code from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0021 Scion

The typical repair costs for addressing the P0021 Scion code can range from $200 to $800, depending on the specific cause of the issue and the parts that need to be replaced. This estimate includes the cost of parts and labor. It is important to note that the actual cost may vary based on the location, vehicle make and model, and the labor rates of the auto repair shop. It is advisable to consult with a professional mechanic to get an accurate estimate for your specific situation.

When is the Code Detected?

After the ECM sends the target duty cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty cycle ratio varies from the target duty cycle ratio.

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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.

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