The P0023 code, indicative of an issue with the “B” Camshaft Position Actuator Circuit (Bank 2), highlights a malfunction in the engine’s variable valve timing (VVT) system, specifically affecting the camshaft’s operation.
P0023 quick overview
| Meaning | P0023 – “B” Camshaft Position Actuator Circuit (Bank 2) |
| Is it serious? | Yes, this issue can lead to suboptimal engine performance, increased fuel consumption, and potential for more significant engine damage. |
| Possible causes | – Faulty camshaft position actuator solenoid valve – Wiring or connector issues from the ECM to the actuator solenoid – Poor pin fitment at the ECM connector – Incorrect oil pressure affecting the VVT system – Mechanical timing problems |
| How to diagnose? | Inspect the actuator solenoid valve for correct operation and resistance. Check electrical connections at the ECM and solenoid for integrity and proper voltage. Evaluate engine oil pressure and quality, as these can impact VVT operation. Overlay wiring to the intake control valve to confirm the wiring integrity. Test for continuity and correct voltage from the ECM to the OCV. |
P0023 Meaning
Triggering a P0023 code points to potential issues within the actuator circuit responsible for adjusting the camshaft’s position in response to engine demands. This sophisticated mechanism relies on precise electrical signals and adequate oil pressure to operate efficiently.
Faults in the electrical circuit, such as poor pin connections at the ECM or damaged wires, alongside mechanical issues like incorrect timing or inadequate oil pressure, can impair the system’s function.
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How to fix P0023 – learn from mechanics
I looked into P0023 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Toyota P0023
Vehicle information 2010 Toyota RAV4 Limited 3.5L
Issue + repair history
- Sets code P0023 as soon as key is on, not running
- Can clear but immediately comes back
- Replaced oil control valve, ECM, connector, and new wires
- Initially replaced solenoid (oil control valve), ran for an hour without light, but then came on and would not clear
- Replaced wires from ECM to solenoid, code cleared out and went 75 miles, but now sets immediately again
Related Repair History
- Oil control valve, ECM, connector, new wires
Mechanic suggestions
- Check if the new valve is genuine and if its resistance is around 6-8 ohms
- Test if the valve works when power is applied and if it can be operated bidirectionally
- Check for pin fitment issues at the ECM connector
- Overlay the wiring to the intake control valve to check integrity
- Confirm if the ECM is applying 12V to the solenoid
- Check continuity from the ECM to the OCV and confirm 12V duty cycle with the OCV activated
- Confirm ECM grounds are good
- Test wires between OCV and ECM carefully
- Consider the possibility of a faulty OCV or wiring if the OCV cannot function properly, affecting cam timing adjustment by the ECU
- Refer to manufacturer-specific test procedures for P0023
Final fix
- Installed 2 new pins at ECM connector, resolving pin tension issue
Case #2: Toyota P0023
Vehicle information 2011 Toyota Sienna LE 3.5L
Issue + repair history
- Sets codes P0010, P0020, P0013, P0023 as soon as key is on, not running
- Codes can be cleared but immediately come back on
- Recent engine tune-up and replacement of coolant hoses
- Disconnected harness to access items changed, suspected low voltage issue
- Ohm out 3 solenoids at 8.1 ohms, activate when power is supplied
Related Repair History
- Recent engine tune-up
- Replaced coolant hoses
Mechanic suggestions
- Check if plugs were crossed when reconnected
- Investigate bad ground or computer driver circuit issues
- Verify if timing jumped or if there are pinched harness wires or swapped connectors during reassembly
- Check all ECM grounds for continuity
- Consider if connectors got wet during coolant flush
- Inspect back of the plenum for loose or misplaced grounds if spark plugs were removed during the process
- Check for coolant migration into connectors
- Look for disconnected ground that goes to the PCM, commonly left loose after a tune-up
- Verify if ECM software matches the vehicle or try reflashing the ECM
- Note the difference between sensors and actuator solenoids
- Double-check all connections and grounds
Final fix
- Located a ground circuit that had only been hand tightened, overlooked initially, and tightened it, resolving the issue.
Case #3: Honda P0023
Vehicle information 2003 Honda Accord EX 3.0
Issue + repair history
- Customer complained of MIL lamp on
- Codes retrieved: P0023, P0011, P0012
- No recent repair history mentioned
- Suspected issue with the camshaft position sensor for bank 2
Related Repair History
- None mentioned
Other OBD2 Codes + Test Results
- P0023: Camshaft timing sensor actuator circuit open
- P0011: Camshaft Position Timing Over-Advanced or System Performance (Bank 1)
- P0012: Camshaft Position Timing Over-Retarded (Bank 1)
Mechanic suggestions
- Check for any loose or corroded electrical connections related to camshaft position sensors and actuators
- Inspect the wiring harness for any signs of damage or wear
- Verify oil pressure and ensure it’s within the manufacturer’s specifications
- Perform a visual inspection of the timing chain and sprockets for any signs of wear or damage
- Check the engine’s timing using a timing light or advanced scan tool to ensure proper alignment
- Test the camshaft position sensor and actuator for proper functionality using a multimeter or scan tool
- Consider performing a compression test to ensure the engine’s internal components are functioning correctly
Final fix
- After thorough inspection, found a loose electrical connector at the camshaft position sensor for bank 2. Tightened the connector, cleared the codes, and verified proper operation. No further issues reported by the customer.
How to diagnose P0023
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Explanation |
|---|---|
| Inspect actuator solenoid and wiring | Check for correct operation, resistance, and any wiring issues. |
| Evaluate oil pressure and quality | Confirm if oil conditions meet specifications for VVT operation. |
| Check ECM and solenoid electrical connections | Ensure integrity and proper voltage at all connections. |
| Overlay wiring to intake control valve | To confirm the wiring integrity and detect any hidden faults. |
| Test continuity and voltage from ECM to OCV | Ensure that the correct signals and power reach the actuator. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko