Technical Description of OBD-II Trouble Code
"B" Camshaft Position Actuator Circuit (Bank 2)
What is the meaning of this code?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Toyota, VW, Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Acura, etc.
A P0023 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 a technology used in the engine to allow it to achieve greater power or efficiency at different running points.
This includes an oil control valve (OCV), also known as a solenoid valve, and other components. This source explains it well:
The powertrain control module (PCM) controls the camshaft position (CMP) actuator through a high control circuit and a low reference circuit. The high control circuit carries a 12 volt pulse width modulated (PWM) signal from the PCM to the CMP actuator solenoid in order to control the amount of engine oil flow to the cam phaser. The low reference circuit is used as a return circuit. The PCM has the ability to monitor the functionality of the high control and the low reference circuit. If the PCM detects an open, a short to ground, or a short to voltage, DTC P0023 is triggered.
The "B" camshaft refers to the exhaust, right, or rear camshaft (looking at the engine from the driver’s seat). Bank 2 refers to the side of the engine that does not contain cylinder #1.
Symptoms
Causes
A code P0023 may indicate that one or more of the following has occurred:
Possible Solutions
It is recommended to refer to a factory service manual for make and model specific steps and specifications. You should use a digital volt ohm meter (DVOM) to measure the resistance of the terminals on the camshaft oil control valve (OCV). Refer to the factory specifications for the reading, and if it is not within the acceptable range, replace the OCV assembly. Also use the DVOM to verify the wiring, connectors, etc. leading from the OCV back to the PCM.
Other camshaft DTC codes: P0011 – P0012 – P0020 – P0021 – P0022
