Engine-Codes - Toyota - P0012 2001 Toyota Corolla

P0012 2001 Toyota Corolla Code - Camshaft Position 'A' Timing Over-Retarded Bank 1 3ZZ-FE Engine

- Code Popularity: 5,097 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0012 2001 Toyota Corolla?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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

Code Tech Notes

Valve timing may have to be adjusted.

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How to Fix the DTC P0012 2001 Toyota Corolla?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0012 2001 Toyota Corolla code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

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.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine Lack / Loss of Power
  • Engine Rough Idle

What Does the P0012 2001 Toyota Corolla Code Mean?

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.

P0012 2001 Toyota Corolla Code - Camshaft Position 'A' Timing Over-Retarded Bank 1 3ZZ-FE Engine

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