P0023 Code: Bank 2 Exhaust Cam Actuator Circuit

P0023 bank 2 exhaust camshaft actuator circuit diagnostic illustration
BANK 2 EXHAUST CAM CIRCUIT

P0023: Check the Correct Circuit

Identify Bank 2 and prove actuator control before replacing a sensor or opening the timing system.

Updated September 16, 2026About 12 min readBy iCARZONE

DIAGNOSTIC FOCUS

CIRCUIT / OPEN
FAULT TYPE
Bank 2 B camshaft actuator control
FIRST CHECKS
Correct bank, connectors and electrical evidence

An actuator circuit code does not prove a position sensor or timing chain has failed.

QUICK ANSWER

P0023 means Camshaft Position B Actuator Circuit/Open (Bank 2). On the cited Toyota and GM applications, this concerns the exhaust camshaft actuator solenoid or oil control valve circuit. Confirm the full manufacturer description before selecting a component.

Preserve the scan, identify the correct bank and compare the circuit's measured behavior with its command. The word position does not make this a camshaft position sensor replacement instruction. An open-circuit description can also include other electrical faults under the manufacturer's monitor.

What Does the P0023 Code Mean?

Variable valve timing can use an electrically controlled oil valve to direct hydraulic pressure to a camshaft timing mechanism. The controller commands the valve while separate position information helps it assess timing. The valve circuit, hydraulic response and position-sensor signal are related, but they are different diagnostic paths.

P0023 concerns the B actuator circuit on Bank 2. B is the exhaust designation in the cited applications. Bank 2 is the bank without cylinder 1; its physical location depends on the engine. Do not assume that passenger side, rear bank or a particular connector color identifies it on every vehicle.

The code records an electrical problem, not a failed part. A disconnected terminal, damaged wire, defective solenoid or controller problem requires different evidence. Timing-chain repairs need separate mechanical or correlation findings.

Identify the circuit

Match the VIN, engine, reporting module and full fault description.

Prove electrical behavior

Compare the diagram, commanded state and measured control path.

Keep timing separate

Use companion timing and sensor faults to guide additional tests.

Clean-looking connectors can still have poor terminal retention or internal wire breaks. A dirty-looking valve does not prove an electrical fault.
P0013: Bank 1 B actuator circuitP0020: Bank 2 A actuator circuitP0023: Bank 2 B actuator circuitP0024: Bank 2 B timing performance

P0023 Symptoms, Severity, and Driving Safety

Engine warning light
Save the fault status and event conditions before erasing anything. The lamp does not identify the failed component.
Rough idle
Altered cam control may accompany unstable running, but misfire and airflow faults need their own checks.
Reduced response
A fallback strategy may affect performance. Record when it happens without forcing an unsafe acceleration test.
Difficult starting
If present, preserve starting and synchronization evidence. A starting problem is not unique to this actuator circuit.
Changed fuel use
Document the observation rather than assigning a fixed percentage. Many operating conditions affect consumption.
Normal apparent operation
An intermittent connection or protected control strategy can leave few obvious symptoms. Normal idle does not prove the circuit is sound.

Arrange diagnosis promptly. Stop for a flashing warning light with severe rough running, repeated stalling, unsafe power loss, low oil-pressure warning, overheating or new mechanical noise. Follow the owner's manual and actual symptoms; P0023 cannot establish a guaranteed safe driving distance.

Keep hands and test leads clear of belts, fans and hot engine parts. Follow the specified shutdown and isolation procedure before disconnecting components. Do not continue running an engine with an oil-pressure warning or severe mechanical noise merely to collect more scan data.

P0023 Causes and the Evidence That Separates Them

These six branches follow a test sequence, not a failure-frequency ranking. Identify the component and inspect connections before testing the circuit and condemning an assembly.

1

Disconnected or disturbed connector

Recent engine work can leave the correct actuator connector loose, damaged or confused with a nearby connection.

How to prove it: Identify Bank 2 exhaust from the engine diagram, then inspect the latch, terminals and service history.

Check first
2

Open or damaged harness

Heat, rubbing, tension or an internal conductor break can interrupt the control path.

How to prove it: Use the OEM isolation procedure and circuit checks. A visual inspection alone cannot prove continuity under the relevant condition.

Check first
3

Short or unwanted connection

The circuit may contact another conductor, a supply or ground. The monitor's wording and failure mode vary.

How to prove it: Test the correct isolated circuit against the diagram; do not apply a universal expected voltage to every driver state.

Verify directly
4

Solenoid electrical defect

A coil or internal connection can fail while its external connector remains intact.

How to prove it: Use the specified component test and temperature conditions. A scan command or audible click alone is incomplete evidence.

Verify directly
5

Shared supply or controller-side condition

Related electrical faults may indicate a common feed, connector or controller operating problem.

How to prove it: Compare companion codes and prove the shared paths before treating each stored code as a separate failed part.

Verify directly
6

Intermittent fault or final controller branch

An event may disappear after movement or cooling; a controller diagnosis requires completed upstream checks.

How to prove it: Reproduce the original conditions safely and follow the manufacturer's final test branch, including applicable service information.

Final branch

Oil condition matters to hydraulic timing, but an oil change cannot repair an open wire or winding. Record maintenance and electrical findings separately.

Using UR800 During P0023 Diagnosis

The iCARZONE UR800 can organize supported fault records, available freeze frame, live data and diagnostic reports before the original event is cleared.

Confirm coverage for the exact VIN and ECU. Available camshaft data and actuator tests depend on vehicle software and tool support. General bidirectional capability does not guarantee a Bank 2 exhaust oil-valve command on every engine.

Use the scanner alongside a wiring diagram and appropriate electrical instruments. It does not directly measure coil resistance, terminal tension, voltage drop, oil pressure or mechanical timing. An unsupported test is a coverage limitation, not proof that the actuator is defective.

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Preserve the cam-control fault event and compare supported commands with measured circuit behavior.

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How to Diagnose P0023 in 6 Steps

Use these six steps to separate identification errors, control-circuit faults and additional timing concerns. Follow the current VIN-specific procedure for the actual tests.

P0023 Quick Diagnostic Path

  • 1

    Save the complete diagnostic event

    • Read the reporting module and accessible companion modules. Record P0023 status, any suffix, battery-related faults and available freeze frame before clearing.
    • Note recent engine work, when the light appeared and whether symptoms depend on heat or vibration. Preserve the original report for the final comparison.
  • 2

    Locate the correct bank and actuator

    • Use the VIN, engine identification and cylinder-numbering diagram to find Bank 2. Confirm that the B designation identifies the exhaust actuator on this application.
    • Distinguish the oil control valve or solenoid from the camshaft position sensor and the mechanical phaser. Similar connectors do not establish interchangeable parts.
  • 3

    Inspect accessible connections safely

    • With the engine safely stopped and the prescribed isolation complete, examine the identified connector, terminal retention and harness routing near heat or moving components.
    • Check work areas recently disturbed and look for tension, rubbing or fluid contamination. Do not force probes into terminals or disconnect components while the procedure prohibits it.
  • 4

    Test the electrical path and component

    • Follow the manufacturer's sequence for the valve, harness and controller circuits. Use the specified test equipment and distinguish powered checks from isolated resistance checks.
    • Record the actual result and operating state. Do not use uncontrolled jumpers, a generic coil-resistance limit or a presumed driver voltage to decide whether the circuit passes.
  • 5

    Compare supported commands and response

    • If an approved active test is available, meet its prerequisites and observe the specified response with the engine and test area safe. Keep command, electrical delivery and mechanical response separate.
    • If the electrical path passes but timing faults remain, follow their hydraulic, sensor or mechanical procedure. An absent PID or unsupported test is not evidence of a failed component.
  • 6

    Repair the demonstrated fault and retest

    • Repair the proven wiring, connector or component problem and restore routing and protection. Complete any setup required for the actual repair rather than assuming every solenoid needs a relearn.
    • Run the applicable confirmation procedure safely, review current and pending faults, and save the final report. A cleared lamp or a single restart is not equivalent to a completed monitor.
Do not measure resistance on a powered circuit, short a controller output to battery voltage or repeatedly energize a valve to force movement. Running-engine tests require safe lead routing and the manufacturer's approved procedure. Stop when operation becomes unsafe.

How to Fix P0023 and Verify the Repair

01

Restore the correct connection

Repair proven terminal or connector damage and reconnect the identified actuator properly. Correct the cause of strain or contamination rather than merely clearing the code.

02

Repair the tested harness fault

Restore the damaged conductor or insulation with the approved method. Retest for the actual open or unwanted connection and secure the harness away from heat and movement.

03

Replace only a failed component

Replace the solenoid or valve when the appropriate test supports that decision. Match the part and installation procedure to the engine; do not substitute a position sensor because of the code's wording.

04

Resolve the remaining OEM branch

Investigate controller, calibration or additional timing concerns only where the completed test tree directs. A successful circuit repair does not automatically resolve a separate mechanical or sensor fault.

01

Diagnostic work

VIN-specific quote
Main cost driver

Request a quote identifying scan analysis, circuit tests and access time. A code scan alone is not the same service as proving the failure.

02

Connector or wiring work

VIN-specific quote
Main cost driver

Cost depends on damage location, access and repair method. Ask whether protective routing and a post-repair circuit test are included.

03

Valve or solenoid service

VIN-specific quote
Main cost driver

Confirm the failed test, exact part and any seals or associated service required. Do not assume both banks need new parts from one stored code.

04

Further timing or controller work

VIN-specific quote
Main cost driver

Ask for separate evidence and approval before expanding the job. Additional branches are conditional, not a list of repairs that every P0023 vehicle needs.

There is no defensible universal repair price for P0023. Obtain a vehicle-specific estimate that separates diagnosis, parts, labor and final verification. Any additional timing work should have its own documented reason.

Keep original and final scans with measured findings to distinguish a repeated circuit problem from a new companion fault.

P0023 OEM Differences and DIY Limits

The cited 2016 Toyota Sienna 2GR-FE procedure identifies the Bank 2 exhaust oil control valve circuit and includes valve and harness checks. Its bank identification, active-test details and electrical specifications belong to that engine and production range.

Toyota example

Exhaust oil control valve circuit; confirm the specified Sienna application.

GM example

Electrical integrity and timing performance are separate monitor paths.

Your engine

Use its bank diagram, full code text and current test procedure.

GM's 2013 OBDG05A document separates P0023 electrical integrity monitoring from P0024 exhaust timing performance. This supports a circuit-first distinction, not a universal GM test voltage or repair. Always match the current service procedure to the VIN and controller.

Reasonable DIY Checks
  • Save the scan and warning messages.
  • Document recent work and operating conditions.
  • Check the owner's manual for warning guidance.
  • Inspect accessible external wiring only when safe.
Professional-Level Work
  • Use qualified help for uncertain circuit identification.
  • Follow approved electrical and running-engine tests.
  • Do not jump controller outputs or force mechanisms.
  • Stop for oil-pressure warnings or severe noise.

Related Camshaft Circuit and Timing Code Guides

Use these guides to distinguish banks, intake and exhaust control, timing results and sensor feedback. They provide context; their vehicle-specific tests and repair conclusions do not transfer automatically to your P0023 case.

P0013
Exhaust camshaft position actuator circuit, Bank 1
P0010
Intake camshaft position actuator circuit, Bank 1
P0020
Intake camshaft position actuator control circuit, Bank 2
P0021
Intake camshaft timing over-advanced, Bank 2
P0022
Intake camshaft timing over-retarded, Bank 2
P0024
Exhaust camshaft timing over-advanced, Bank 2
P0341
Camshaft position sensor A range/performance

For other stored faults, use the iCARZONE OBD-II fault-code center.

Frequently Asked Questions About P0023

What does the P0023 code mean?
It identifies the Camshaft Position B Actuator Circuit/Open on Bank 2. The cited applications use the exhaust actuator solenoid or oil control valve. Confirm the full OEM text and engine before selecting a connector or test.
Is P0023 a camshaft position sensor code?
Not directly. It concerns actuator control, while a position sensor supplies feedback. Investigate a sensor only when its own evidence or the manufacturer's diagnostic procedure supports that branch.
Which side of the engine is Bank 2?
It is the bank without cylinder 1. Its physical side depends on engine orientation and cylinder numbering. Use the engine diagram rather than a universal driver-side or passenger-side rule.
Can low or dirty oil cause P0023?
Oil problems can affect hydraulic cam timing, but this code requires attention to the monitored actuator circuit. Check required maintenance and warnings without assuming an oil change repairs an open wire, terminal or coil.
Can I drive with P0023?
Follow the owner's manual and symptoms. Stop for severe rough running, unsafe power loss, repeated stalling, an oil-pressure warning or new mechanical noise. The code cannot guarantee a safe distance.
Can UR800 test the exhaust cam solenoid?
Only if the exact VIN, ECU and software support the relevant active test. Confirm coverage before purchase. A command on the screen does not by itself prove that the electrical signal reached the valve.
Should I replace the timing chain?
P0023 alone does not justify that repair. Establish the actuator circuit condition first, then follow separate correlation, timing or mechanical evidence if present. A large repair needs a demonstrated failure.
How do I confirm the P0023 repair?
Complete the applicable manufacturer confirmation procedure and compare the final scan with the original event. Check current and pending faults and monitor completion. Avoid treating repeated erasure as proof of a repair.

Sources and Technical Review Notes

Bottom line: Identify the actual Bank 2 exhaust actuator and prove its circuit. Repair the supported fault, then complete the right monitor; do not select a sensor or timing-chain repair from the code alone.
iCARZONE
iCARZONE

Technical sources checked September 16, 2026. This is a source-based diagnostic guide, not a report of a hands-on vehicle repair. Confirm bank identification, actuator design, circuit states and test limits against current service information for the exact VIN.

Educational guidance only. Hot parts, moving components and incorrect electrical tests can cause injury or damage. Use current OEM procedures and qualified service where needed.

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