P0023 code definition

Camshaft Position B - Actuator Circuit (Bank 2)

What the P0023 code means

P0023 is the OBD-II generic code indicating the Engine Control Module (ECM) has determined that the bank 2 exhaust camshaft Oil Control Valve (OCV) has an open or short circuit. This happens during one drive cycle.

What causes the P0023 code?

  • The OCV is operated by the ECM to less than a 80% duty cycle and output is 100%.
  • The OCV is commanded by the ECM to open up to 70% and output is less than 3%.
  • The OCV or wiring to the bank 2 exhaust camshaft may be shorted out or have an open circuit.

What are the symptoms of the P0023 code?

  • The ECM will turn on the Check Engine Light.
  • The idle may be normal but hesitates on acceleration.
  • The engine may have a hard start condition if the OCV is shorted.
  • The engine will have a reduction in fuel mileage if the OCV is shorted or opened.
  • The engine may run rough or stall depending on timing position during deceleration.

Note: Symptoms may change depending on the timing positions of the camshaft.

How does a mechanic diagnose the P0023 code?

  • Visually inspects the wiring and connections at the OCV and the ECM

  • Scans the computer for trouble codes and documents freeze frame data to see when the failure happened

  • Retests the vehicle to see if the P0023 code comes back

  • Checks the OCV for the correct resistance to see if the valve is shorted or opened internally

  • Checks the wiring from the ECM to the OCV for open or short circuits

  • Performs a manufacturer's specific pinpoint test for the P0023 code and repairs as needed if the code returns

Note: Follow the manufacturer's recommended pinpoint test to narrow down the problem; each engine may be tested differently and possible engine internal damage may occur if tests are not performed in accordance with a correct procedure.

Common mistakes when diagnosing the P0023 code

Follow these simple guidelines to prevent mistakes:

  • Check engine oil to see if it is full, clean and of the correct viscosity.
  • Test system to verify the code coming back before any further tests or repairs are done.
  • Follow the manufacturer pinpoint test procedures step by step.
  • Replace only sensors or components where tests indicate a problem.

How serious is the P0023 code?

  • The engine may run rough and stall.

  • The engine's fuel consumption may get worse and the engine may get carbon fouling of internal valve components.

  • Driving the vehicle for prolonged time with the circuit shorted may damage the ECM.

What repairs can fix the P0023 code?

  • Clearing the code and retesting the system to verify the problem
  • Repairing or replacing the wiring to the exhaust camshaft oil control valve for bank 2
  • Replacing the camshaft oil control valve for bank 2 exhaust camshaft
  • Replacing the ECM

Additional comments for consideration regarding the P0023 code

The code's P0023 problems can happen when the OCV connector has corrosion that will act like an open circuit in the valve. The wiring to the sensor, if broken or shorted, can cause the code.

Need help with a P0023 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

This article originally appeared on YourMechanic.com as P0023 OBD-II Trouble Code: Camshaft Position B - Actuator Circuit (Bank 2) and was authored by Jay Safford.


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