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All codes/P0021

P0021

A Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

High severity

This means your engine's computer sees that the intake camshaft on 'Bank 2' (the side of the engine without cylinder #1) is rotating too far ahead of where it should be, affecting engine performance.

The Powertrain Control Module (PCM) has detected that the intake camshaft timing for Bank 2 is more advanced than the desired position.

Common causes

  • Low or dirty engine oil

    Variable Valve Timing (VVT) systems rely on clean, proper oil pressure; old or low oil can hinder operation.

    high

    Typical part cost: $0-100 (oil change)

  • Faulty Oil Control Valve (OCV) / VVT solenoid

    The OCV controls oil flow to the camshaft phaser; if it's stuck or faulty, timing will be off.

    medium

    Typical part cost: $50-250 part

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First things to check

  1. 1Check engine oil level and condition; perform an oil change if needed
  2. 2Inspect wiring and connectors to the OCV/VVT solenoid and CMP sensor for Bank 2

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Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

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Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

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Related codes

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Frequently asked questions

What is 'Bank 2'?

Bank 2 refers to the side of the engine that does NOT contain cylinder #1. This applies to V-type engines, as inline engines only have one bank.

Is P0021 similar to P0011?

Yes, P0021 is essentially the same issue as P0011, but it occurs on Bank 2's intake camshaft instead of Bank 1's. The diagnostic steps are very similar.

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