What does fault code P0023 mean?
The P0023 fault code, applicable to all car manufacturers, means “B Camshaft Position – Actuator Circuit/Open (Bank 2)“.
Background Information: The camshaft controls the opening and closing of the valves. In a variable valve timing system, the electronic camshaft adjusting valve (or oil control valve, OCV) adjusts the camshaft angle by changing the oil pressure to the camshaft adjuster (mechanical) according to instructions from the engine control module (ECM), ensuring the valves open and close at the optimal time. Possible causes of P0023 include the exhaust/right/rear camshaft adjusting valve (oil control valve), its circuitry, connectors, excessively dirty oil, or the ECU. “B” camshaft must refer to the “exhaust,” “right,” or “rear” camshaft. Determine left/right and front/rear from the driver’s position. The first group refers to the group including cylinder 1, and the second group is the group opposite the first.
Symptoms of Error Code P0023
The main signs indicating the presence of error P0023 are:
- “Check Engine” light illuminates
- Unstable engine idle
- Loss of traction during acceleration
- Difficulty starting the engine
- Loud engine noise and vibrations
- Increased fuel consumption
Main Causes of Error Code P0023
- Damaged or stuck phase control solenoid valve
- Irregular electrical wiring: short circuits, open circuits, corroded connectors
- ECU problem, improper control of the solenoid valve circuit
- Low or dirty engine oil
- Mechanical failure of the camshaft or phase shifter
Error Code P0023 in Different Vehicles
Toyota P0023: It appears on engines equipped with the VVT-i system, especially in V6 and V8 models. The usual cause is oil contamination.
BMW P0023: It is more common in diesel engines equipped with the VANOS system. It may be related to damaged wiring harness or the VANOS coupling itself.
Hyundai/Kia P0023: This is typical for Theta and Lambda engines. The main cause is solenoid valve failure.
Ford P0023: This is especially common in Ecoboost engines. The problem can be either in the solenoid valve or in contamination of the oil system.
Nissan P0023: It is most common in VQ series engines. The main causes are low oil pressure and power supply failure to the solenoid valve.
How to Diagnose Error Code P0023?
Step 1: Read the error code using an OBD2 diagnostic scanner.
Step 2: Clear the fault code and check if it reappears after the engine starts.
Step 3: Check the condition of the wires and connectors leading to the VVT solenoid valve.
Step 4: Test the resistance of the solenoid valve with a multimeter. The nominal value is usually between 6 and 12 ohms.
Step 5: Check the condition of the engine oil – level, viscosity, and purity.
| Possible Cause | How to Check？ |
|---|---|
| Faulty VVT solenoid valve | Measure resistance with a multimeter |
| Damaged wiring | Perform a visual inspection and check the circuit |
| Oil passage blockage | Check the cleanliness of the engine oil and oil filter |
| ECU malfunction | Diagnose with an OBD2 scanner |
Tools needed: OBD diagnostic tool, multimeter, a set of hand tools (screwdrivers, wrenches), contact cleaner, oil dipstick
How to fix error code P0023? (Solutions to the problem)
Simple repair methods
- Reset the error code and test drive (if the error is intermittent)
- Check and replace the engine oil if necessary
- Clean or replace the solenoid valve connector and contacts
In-depth diagnostic and repair solutions
- Replace the faulty VVT phase control solenoid valve
- Repair or replace wiring and connectors
- Flush the VVT system from deposits
- Check and update the ECU firmware if necessary
| Symptoms | Possible solutions |
|---|---|
| Power loss | Replace the solenoid valve or clean the oil passages |
| Unstable idle | Check the circuit and solenoid resistance |
| Increased fuel consumption | Diagnosis of valve timing and oil phase |
P0023 Frequently Asked Questions
Can you drive with error code P0023?
It is not recommended. Error P0023 can lead to reduced engine performance, increased fuel consumption, and potential malfunction of the variable valve timing system.
Will error P0023 disappear on its own?
Sometimes, if the problem is intermittent, the error may temporarily disappear. However, if the cause of the malfunction is not eliminated, the error will certainly reappear.
Do I need to change the oil when P0023 appears?
Yes, dirty or unsuitable engine oil can affect the operation of the VVT system. It is recommended to change the engine oil and oil filter.
Can I fix error P0023 myself?
If you are confident in your technical skills, you can check the VVT solenoid valve, wiring condition, and change the oil. However, it is best to leave complex malfunctions to experts.
Is the P0023 error harmful to the engine?
Yes, prolonged operation with this error can lead to serious damage to timing components and shorten engine life.
Related OBD2 Errors:
P0010 – A Camshaft Position Actuator Circuit/Open (Bank 1)
P0020 – A Camshaft Position Actuator Circuit/Open (Bank 2)
P0021 – A Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)
Important! If the problem is not resolved, it may lead to a shortened engine lifespan and expensive repairs to the phase shifter or camshaft. Regularly change the engine oil, monitor its quality, and do not delay repairs if errors occur. This will help avoid costly engine repairs.