Error P0012 – how to fix?

Code definition P0012

Camshaft Position “A” – Time Delay Too Long (Bank 1)

What does the code P0012 mean

P0012 is a general 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 the ECM ordered. This over-retarded camshaft condition may occur during the camshaft timing lead or timing phase.

What is the cause of the code P0012?

• Variable camshaft oil control valve (OCV) stuck open.
• The camshaft shifter is damaged and stuck in the retarded position.
• Problems with oil flow to the piston and the VCT chamfer.

What are the symptoms of the P0012 code?

• The ECM will turn on the Check Engine Light if the timing cannot be commanded to run.
• The engine will have a difficult start due to the delayed timing position.
• Fuel mileage may decrease because the camshaft is unable to obtain the best possible fuel mileage.
• Depending on the position of the camshaft, the engine may stop, oscillate, and run erratically.
• The vehicle will not pass the emissions test.

Note: Driving problems will vary with the timing position when the camshaft has stopped extending.

How can a mechanic diagnose the P0012 code?

1. Visually inspect the electrical connections at the camshaft sensor, oil control solenoid valve, and crankshaft sensor for loose connections, damaged wiring harnesses, or other issues that may be causing the problem.
2. It ensures that the engine oil is filled with clean oil of the correct viscosity.
3. A technician scans and documents the codes received and reviews the data from the frozen frame to see when the code has been set.
4. He must then reset the codes to clear the OBD-II fault codes and retest the vehicle to see if the P0012 code reappears.
5. The oil control valve solenoid command turns on and off to check if the camshaft timing changes.
6. If no issues were observed and the code still exists, the next step for the technician is to run manufacturer-specific troubleshooting tests for the code P0012 and repair as needed.

Note: Follow the manufacturer’s recommended spot testing to narrow down the problem as each engine may be tested differently and damage to the internal engine may occur if the tests are not performed according to the correct procedure.

Common errors in diagnosing P0012 code?

• Follow these simple tips to avoid mistakes:
• Always check whether there is a fault before starting any repair work.
• Carefully check visually for any wiring or connection problems.
• Perform a step-by-step troubleshooting test to prevent misdiagnosis.
• Do not replace any parts unless instructed to do so by pinpoint or visual testing.

How serious is the P0012 code?

• The engine may run erratically and may stagger, swing, run erratically, or have difficulty starting.
• Depending on the improper camshaft alignment, the engine can have excessive fuel consumption, carbon build-up in engine components, and various driving problems.
• Driving the car for extended periods with inelastic camshafts can cause other problems with the timing system or the engine depending on the cause of the failure.

What repairs can remove the P0012 code?

1. Resetting fault codes and performing a road test.
2. Change the oil and filter with oil with a viscosity appropriate to the engine specification.
3. Repair or replacement of wiring or connection to the camshaft oil control coil.
4. Replace the camshaft oil regulating valve for the intake camshaft in station 1.
5. Check timing chain setting for “skipped” timing problems and repair as needed.

Additional notes to be considered regarding code P0012

The valve timing adjuster controls the timing advance and deceleration function using pressure and oil. The oil must be of the correct viscosity for the camshaft timing control to function as intended. Using an oil that is too thick may cause the system to malfunction and cause code and engine problems. Incorrect oil can cause this code and can result in multiple codes together.