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  • DTC P0023 stands for “Exhaust ‘B’ Camshaft Position Actuator Circuit (Bank 2).” It’s logged when the PCM detects that the voltage from the VVT circuit is out of specification for a set period.
  • Some of the possible causes of this trouble code include a failed (shorted or open) VVT actuator winding, a malfunctioning VVT oil flow control valve solenoid, and VVT circuit issues (damaged wires and poor connections).
  • An activated check engine light, reduced engine power, rough running, and increased fuel consumption are some of code P0023’s symptoms.

Your vehicle is equipped with various systems that work together to keep your engine running as it should. One example is your vehicle’s variable valve timing (VVT) system. This system helps improve engine performance and/or fuel efficiency. But what happens when one of its components goes bad?

P0023 is a generic diagnostic trouble code (DTC) related to the operation of the VVT control circuit. If you’ve retrieved this code from your scan tool and want to know what it means, here is some basic information that may help you.

What Does the P0023 Code Mean?

Diagnostic trouble code P0023 stands for “Exhaust ‘B’ Camshaft Position Actuator Circuit (Bank 2).” The “B” camshaft refers to the exhaust camshaft and “bank 2” refers to the side of the engine opposite the #1 cylinder.

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The powertrain control module (PCM) monitors the variable valve timing (VVT) circuit for high and low voltage. If the voltage is out of specification for a calibrated amount of time, the PCM sets P0023.

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Your vehicle is equipped with various systems that work together to keep your engine running as it should.

Toyota describes this code as indicating opens or shorts in the camshaft oil control valve circuit. If the oil control valve duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and store the P0023.

Meanwhile, Ford’s condition for P0023 to set is that the solenoid’s commanded state does not match the actual state for greater than 5 seconds.

Other OEMs are similar but each one has its own criteria.

If you’re planning to diagnose or troubleshoot P0023 yourself, you can get more useful information from our advanced technical discussions about the camshaft actuator and VVT systems.

Note: The definition of code P0023 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

More About VVT

Most late model vehicles are equipped with a VVT system. This system adjusts the opening and closing of the intake and/or exhaust valves to improve engine performance and/or fuel efficiency.

To increase engine power, the intake and exhaust camshaft timing should be retarded when the RPM is higher. Under mid-range RPM (under light load), it should be advanced to reduce pumping losses and contribute to fuel efficiency.

When the engine is under load, exhaust timing may be retarded to reduce NOx gases.

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The PCM uses the VVT solenoids and camshaft actuators to move the camshaft adequately and deliver the power needed by your engine.

If the PCM perceives a problem with the bank 2 exhaust camshaft actuator control circuit, it logs code P0023.

What are the Possible Causes of the P0023 Code?

  • Failed (shorted or open) VVT actuator winding
  • Malfunctioning VVT oil flow control valve solenoid (open or short circuit)
  • VVT circuit issues (damaged wires and poor connections)
  • Faulty PCM or software in need of an update

What are the Common Symptoms of the P0023 Code?

How to Diagnose the P0023 Code

obd code checking done by male adult mechanic
Diagnosing a P00023 code can be difficult if you are not well-versed in auto repair.

Diagnosing a P00023 code can be difficult if you are not well-versed in auto repair. In most cases, the best course of action is to bring your vehicle to an auto shop.

To learn more about what the diagnostic procedures for this code might involve, you may consult a vehicle-specific repair manual or an online auto repair database.

How to Fix the P0023 Code

The diagnostic and repair procedures for this DTC may vary between automakers. For example, the steps for troubleshooting a P0023 Ford code may be different from how a mechanic would troubleshoot code P0023 in a Lexus.

Going to an auto shop is the best option for vehicle owners who have limited auto repair knowledge. Alternatively, advanced DIYers may search for vehicle-specific fixes by consulting the vehicle’s repair manual or by searching for factory repair information from an online database.

Where to Get Replacement Parts to Fix DTC P0023

As previously mentioned, several issues can trigger the P0023 code. That means resolving it can involve anything from replacing a faulty part to updating outdated software. If your mechanic identified that you need to replace a faulty part to clear the trouble code, you can find what you need here at

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Whether you’re in the market for a new valve variable timing oil flow control valve solenoid or something else, our wide selection of on-hand and ready-to-ship parts has you covered. We have strategically located warehouses across the country, so if you place your order today, you can get it in as fast as two business days.

Use our vehicle selector to view the parts that are compatible with your ride. If you want to narrow the selection further to fit your preferred brand, price, and features, simply change the filters. Do you have questions or need help while shopping? Don’t hesitate to contact our round-the-clock customer service representatives through our toll-free hotline.

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About The Authors
Written By Automotive and Tech Writers

The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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william morrison

thank you so much gives me an idea as you can tell i been listening too everyone besides a professional and spending way to much thanks again p0023

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