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OBDII Code List

P0012 2005 TOYOTA COROLLA - Camshaft Position 'A' Timing Over-Retarded Bank 1 3ZZ-FE Engine

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?
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Possible causes

  • Low or Dirty Engine Oil
  • Faulty variable valve timing (VVT)
  • Faulty oil control valve (OCV)
  • Variable Valve Timing (VVT) harness is open or shorted
  • Oil Control Valve (OCV) harness circuit is open or shorted
  • Damaged ECM
What does this mean?

Tech notes

Valve timing may have to be adjusted.
What does this mean?

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.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible Lack/Loss of power
  • Possible Engine rough idle

P0012 2005 TOYOTA COROLLA Description

The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.
OBDII Code P0012 2005 Toyota Corolla - Camshaft Position 'A' Timing Over-Retarded Bank 1 3ZZ-FE Engine -

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P0012 2005 TOYOTA COROLLA Comments

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Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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