Error P0012 – how to fix it?

Setting the P0012 Code

Position of camshaft “A” – time delay too long (Bank 1)

What code P0012 means

P0012 is a generic OBD-II code that indicates that the engine control module (ECM) has determined that the intake camshaft timing for bank 1 is more delayed than commanded by the ECM. This excessively retarded timing condition can occur during the forward or retarding phase of camshaft timing.

What is the cause of the P0012 code?

• The camshaft variable oil control valve (OCV) is stuck in the open position.
• The cam lever is defective and stuck in the retarded position.
• Problems with oil flow to the piston and the VCT phaser.

What are the symptoms of the P0012 code?

• The ECM will turn on the Check Engine Light if the time cannot be commanded to move.
• The engine will have difficulty starting due to the delayed timing position.
• Fuel mileage may decrease because the camshaft is not able to get the best possible fuel mileage.
• Depending on the position of the camshaft, the engine may stall, hesitate, and run unevenly.
• The vehicle will fail the emissions test.

Note: Driving problems will vary depending on the synchronization position when the camshaft has stopped moving forward.

How can a mechanic diagnose the P0012 code?

1. Visually check the electrical connections at the camshaft sensor, oil control solenoid valve, and crankshaft sensor for loose connections, damaged wiring harnesses, or other problems that may be causing the problem.
2. Make sure the engine oil is filled with clean oil of the correct viscosity.
3. The technician scans and documents the codes received and reviews the freeze frame data to see when the code was set.
4. You must then reset the codes to clear the OBD-II error codes and retest the vehicle to see if the P0012 code reappears.
5. The oil control valve solenoid control switches on and off to see if the camshaft timing is changing.
6. If no problems are observed and the code still exists, the next step for the technician is to perform manufacturer-specific troubleshooting tests for the P0012 code and repair as needed.

Note: Follow the manufacturer’s recommended spot tests to reduce the problem, as each motor may be tested differently and internal motor damage may occur if testing is not performed according to the correct procedure.

Common errors when diagnosing P0012 code?

• Follow these simple tips to avoid errors:
• Always check for a malfunction before attempting repairs.
• Carefully visually check for problems with wiring or component connections.
• Perform a step-by-step troubleshooting test to avoid misdiagnosis.
• Do not replace any parts unless advised by a visual test or display test.

How serious is the P0012 code?

• The engine may run erratically and stagger, hesitate, run erratically, or have difficulty starting.
• Depending on the misalignment of the camshaft, the engine may experience excessive fuel consumption, carbon deposits on engine components, and various driving problems.
• Driving the car for a long time with inelastic camshafts can cause other problems with the camshaft or engine, depending on the cause of the failure.

What fixes can clear the P0012 code?

1. Reset the error codes and perform a road test.
2. Change the oil and filter to an oil with the correct viscosity for the engine specification.
3. Repair or replace wiring or connection to camshaft oil control solenoid.
4. Replace the camshaft oil control valve for the intake camshaft in position 1.
5. Check timing chain alignment for skip timing problems and repair as necessary.

Additional notes to consider for code P0012

The camshaft timing regulator controls the forward and retarding timing functions using pressure and oil. The oil must be of the correct viscosity for the camshaft timing control to function as intended. Using oil that is too viscous can cause this system to malfunction and cause problems with codes and engine operation. The wrong oil can cause this code and can cause many codes together.