Description of OBD-II DTC Trouble Code
The timing of the “A” camshaft is excessively retarded (Bank 1).
What does this mean?
This diagnostic trouble code (DTC) is a generic powertrain code that applies to OBD-II equipped vehicles, such as Toyota, VW, Honda, Chevrolet, Hyundai, Audi, Acura, etc.
A P0012 code refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car’s PCM (powertrain control module) or ECM (engine control module). VVT is an engine technology that allows for greater power or efficiency at different running points.
This code specifically relates to the timing of the camshaft. If the cam timing is excessively retarded, the engine light will illuminate and the code will be set. The “A” camshaft can be either the intake, left, or front camshaft. This code is specific to bank 1, which is the side of the engine containing cylinder #1.
Potential Symptoms
Most likely, a P0012 DTC will result in one of the following symptoms:
There may be other potential symptoms as well. When trouble codes are set, the malfunction indicator lamp (check engine light) will illuminate.
Causes
A P0012 DTC trouble code may be caused by one or more of the following:
Possible Solutions
The main thing to check is the operation of the VCT solenoid. Look for a sticking or stuck VCT solenoid valve caused by contamination. Refer to the vehicle-specific repair manual for component tests on the VCT unit. Note: Dealer technicians have advanced tools and the ability to follow detailed troubleshooting steps, including testing components using a scan tool.
Other related DTCs: P0010 – P0011 – P0020 – P0021 – P0022
