P0024 on 2009-2015 Toyota Venza 3.5L: Exhaust Cam Timing Over-Advanced Causes and Fixes

What's Unique About the 2009-2015 Toyota Venza

The Toyota 2GR-FE V6 is a robust engine, but its VVT-i system is highly sensitive to oil level and cleanliness. For this reason, the most common cause of P0024 is often not a major mechanical failure, but simply low/dirty oil or a clogged Oil Control Valve (OCV) solenoid that regulates oil flow. Early production 2009 Venza models are also included in a Toyota Technical Service Bulletin (TSB T-SB-0094-09) for a potential ticking noise accompanied by VVT codes, which in some cases pointed to a more serious issue with the VVT-i gear itself. Additionally, many early 2GR-FE engines (approx. 2006-2009) were built with a rubber VVT-i oil line for Bank 1 (rear bank) that was prone to rupturing, causing catastrophic oil loss. While this doesn't directly cause P0024, it highlights the VVT system's critical dependence on oil pressure and the importance of checking 🎬 Watch: How the VVTi system works and why it rattles. for the updated all-metal line.

Symptoms You May Notice

• Check Engine Light is on
• Rough or unstable idle
• Poor acceleration and loss of power
• Engine hesitation or stalling
• Decreased fuel economy
• Engine makes a rattling or knocking noise, particularly on cold start
• Shuddering during acceleration

Most Likely Causes

1. Low or Dirty Engine Oil 🔴 High Probability The VVT-i system relies on clean oil and proper pressure to function. Sludge, debris, or a low oil level can impede the movement of the VVT components, causing timing to become over-advanced.
   How to confirm: Check the engine oil dipstick. The oil should be within the proper range and not appear black, thick, or sludgy. Ensure the correct viscosity oil is being used (typically 5W-30 or 0W-20, check owner's manual).
   Typical fix: Perform an oil and filter change using a high-quality synthetic oil of the manufacturer-specified viscosity and an OEM filter.
   Est. part cost: $30-$70
2. Faulty Bank 2 Exhaust Oil Control Valve (OCV / VVT Solenoid) 🔴 High Probability → Shop Engine Variable Valve Timing (VVT) Solenoid The OCV is a small solenoid that can get clogged with debris from the oil or fail electrically, causing it to stick in the advanced position. It's the most common component failure for this code.
   How to confirm: Swap the Bank 2 (front) exhaust OCV with the Bank 2 intake OCV. Clear the codes and drive. If the code changes to P0021 (Intake 'A' Camshaft Position - Timing Over-Advanced), the OCV is faulty. You can also test the solenoid's resistance with a multimeter (should be 6.9-7.9 ohms at 68°F/20°C) or apply 12V to see if it clicks.
   Typical fix: Replace the Bank 2 exhaust Oil Control Valve. It is located on the front of the engine on the valve cover and is easily accessible by removing a single 10mm bolt.
   Est. part cost: $40-$180
3. Clogged Oil Control Valve (OCV) Filter 🟡 Medium Probability → Shop Engine Variable Valve Timing (VVT) Solenoid A tiny mesh filter protects each OCV. This filter can become clogged with sludge or debris, starving the VVT system of oil pressure and preventing the phaser from returning to its base position.
   How to confirm: When removing the OCV for inspection or replacement, remove the bolt holding the filter housing (a small cap near the OCV) and inspect the small screen for blockage.
   Typical fix: Clean the filter with brake cleaner or, ideally, replace it. It is highly recommended to replace this inexpensive filter whenever replacing an OCV.
   Est. part cost: $5-$15

Rare But Worth Checking

• Failing VVT-i Camshaft Gear (Phaser): → Shop Engine Camshaft This is a more serious mechanical issue. Early 2GR-FE engines were more prone to this, sometimes causing a brief, loud rattle on cold startup as the gear's internal lock pin fails or oil pressure bleeds off. Toyota issued TSB T-SB-0094-09 for 2009 Venza models that experienced a ticking noise with this code, which could require replacing the gear assembly. This is an expensive, labor-intensive repair often requiring engine removal.
• Stretched Timing Chain: → Shop Engine Timing Chain While possible on very high-mileage engines or those with severe oil maintenance neglect, this is not a common failure point for the 2GR-FE engine. This would typically be accompanied by persistent rattling noises, not just on startup, and potentially other timing-related codes for both banks.
• Faulty ECM (Engine Control Module): In extremely rare cases, the engine computer itself can be the source of the problem, incorrectly interpreting sensor data or failing to properly command the OCV. This should only be considered after all other mechanical and electrical possibilities have been exhaustively ruled out.

Diagnosis Steps

1. Read the code with an OBD-II scanner and confirm P0024 is present. Note any other codes and freeze frame data.
2. Check the engine oil level and condition. If it is low, dirty, or the wrong viscosity, perform an oil and filter change first, clear the code, and see if it returns. This solves the problem a surprising amount of the time.
3. Locate the Bank 2 (front) exhaust Oil Control Valve (OCV). It is on the valve cover closest to the radiator, held in by a single 10mm bolt.
4. Disconnect the electrical connector and remove the bolt. Gently twist and pull the OCV out. Inspect it for sludge or debris. Check that the internal plunger moves freely.
5. Diagnostic Swap: Swap the suspect exhaust OCV with the intake OCV on the same bank (they are identical parts). Reinstall, clear the codes, and drive the vehicle. If the code changes to P0021 ('A' Camshaft Position Timing Over-Advanced), you have confirmed the OCV is the faulty part. This is the most definitive and cost-effective diagnostic step.
🎬 See two quick DIY methods to fix the P0024 code.
6. Bench Test (Optional): Test the solenoid's resistance with a multimeter (should be ~6.9-7.9 ohms at 68°F/20°C). You can also briefly apply 12V power to its terminals to see if the internal plunger clicks open and closed.
7. While the OCV is removed, locate and remove the small OCV filter screen. It's usually under a cap bolt near the OCV port. Clean it thoroughly with brake cleaner or replace it.
8. If the oil is good and the OCV tests fine (or the swap doesn't move the code), the issue may be more complex. Listen for a cold start rattle which could indicate a failing VVT gear. At this point, professional diagnosis with a tool like Techstream to monitor VVT angles in real-time may be necessary.

Parts You'll Likely Need

• Engine Oil Control Valve (VVT Solenoid) (OEM #15330-0P020 (Supersedes 15330-31020)) — This is the most common part to fail for code P0024. It gets stuck or clogged with oil sludge, preventing proper camshaft timing adjustment.
  Trusted brands: Toyota (OEM), Aisin (OEM Supplier), Denso (OEM Supplier)
  OEM price range: $120-$180
  Aftermarket price range: $40-$90
• Oil Control Valve Filter (OEM #15678-46020) — This small, inexpensive screen can get clogged and restrict oil flow to the OCV and VVT phaser. It is best practice to replace it when servicing the OCV.
  Trusted brands: Toyota (OEM)
  OEM price range: $5-$15
  Aftermarket price range: $5-$10

Related Codes That Often Appear With This One

• P0025 — P0025 is for 'Timing Over-Retarded' on the same camshaft. Seeing both may indicate an erratic OCV or a more significant mechanical issue with the VVT phaser.
• P0014 / P0015 — These are the equivalent over-advanced/over-retarded codes for Bank 1 (the rear bank). If you have codes for both banks, it points towards a systemic issue like very low/dirty oil or low oil pressure from a failing pump.
• P0017 / P0018 — These are camshaft/crankshaft correlation codes. If seen with P0024, it can point more strongly towards a stretched timing chain or a failing VVT gear, as the ECM is seeing a discrepancy between the crank's position and the cam's position.

Technical Service Bulletins (TSBs) & Recalls

• T-SB-0094-09 Rev1: 2GR-FE Engine Ticking Noise and/or MIL 'ON' with VVT DTCs (including P0024).
• T-SB-0105-11: Intermittent VVT System Malfunction with related DTCs.
• T-SB-0041-13: Brief Engine Knock/Rattle Noise at Cold Startup (for related 1AR/2AR engines, but describes similar VVT gear issues).

Platform-Specific Known Issues

• TSB T-SB-0094-09 Rev1: Affects 2009 Venza models. Some vehicles may exhibit a ticking noise from the engine and set VVT codes, including P0024. The TSB procedure may involve replacing the camshaft and VVT gear assembly, a major repair covered under the powertrain warranty for 60 months/60,000 miles.

Mechanic-Grade Diagnostic Values

• Camshaft Oil Control Valve (OCV) Resistance — expected: 6.9 to 7.9 Ω at 20°C (68°F). Failure: A reading outside this range indicates a faulty solenoid coil.
• Techstream Live Data - VVT Target vs. Actual Angle — expected: The 'Actual' angle should closely follow the 'Target' angle as engine RPM changes.. Failure: A significant, persistent lag or a stuck 'Actual' angle while the 'Target' angle changes indicates a mechanical or hydraulic problem (stuck OCV or phaser).

Scan Tool Commands That Help

• Techstream: Active Test: 'Control the VVT System (Bank 2)' — This bidirectional control allows a technician to command the OCV to advance or retard the cam timing while the engine is idling. It's used to verify if the OCV and VVT phaser are mechanically capable of responding to ECM commands, helping to isolate a sticky OCV or phaser from an electrical or sensor issue.

Wiring & Ground Locations

• B3 — Top rear of the engine.. This is a primary ground point for the Engine Control Module (ECM) on the 3.5L engine. A corroded or loose ground at this location can cause erratic behavior in various engine systems, including the VVT solenoids, potentially leading to incorrect operation and fault codes.
• OCV Connector (Bank 2 Exhaust) — On the front valve cover (radiator side), connected to the outermost solenoid.. This is the direct electrical connection for the component in question. Technicians will test for 12V power and a duty-cycle ground signal from the ECM at this connector's pins to rule out wiring issues between the ECM and the solenoid.

Real Owner Repair Stories

• YouTube user comment on '2gr-fe 3.5 catastrophic cam gear/ timing chain issue' video (2006 Toyota Avalon (same 2GR-FE engine)) — Check Engine Light with codes indicating crank/cam correlation issues after a tune-up.
  ❌ Tried (didn't work) Extensive diagnosis (20-30 hours) by the owner., A Toyota dealership spent three days diagnosing and ultimately recommended a full engine replacement.
  ✅ What actually fixed it The center section of the exhaust cam phaser/actuator had physically 'walked out', relieving spring pressure and preventing it from returning to its base position. The owner replaced the faulty VVT phaser/actuator himself with the engine in the car, which resolved the code.
• NHTSA ODI #10326139 (Toyota Avalon with 2GR-FE engine) — An owner reported VVT timing malfunctions including P0024 and P0012. A technician found the oil level was one quart low and leaking from the VVT-i line. The repair required replacing both VVT cams, cam housings, cam gears, and the oil pump.

OEM Part Supersession History

• 15330-31020 → 15330-0P020 — Standard part revision and consolidation by Toyota over the years.
  Heads up: The new part number (15330-0P020) is the correct and direct replacement for the original. There are no known incompatibility issues.

Model Year Variations Within This Range

• 2009-2010 (approx.): Early 2GR-FE engines were equipped with a VVT-i oil line for Bank 1 (rear bank) that used a rubber hose section. This hose was prone to rupturing, causing rapid oil loss. Later models were updated with an all-metal line (PN 15772-31030). While this part is on Bank 1 and doesn't directly cause a Bank 2 code like P0024, its failure can cause system-wide oil starvation, triggering multiple timing codes.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Rupturing VVT-i Oil Line (Bank 1) 🔴 High — Common on early models (approx. 2009-2010) that have not had the updated part installed. Can fail at any mileage, leading to catastrophic oil loss. (Ref: Toyota Limited Service Campaign (LSC) ZE2)
• Water Pump Failure 🟠 Medium — A known weak point on the 2GR-FE, typically failing between 80,000-130,000 miles. Failure is usually a slow leak from the weep hole, but can fail internally.
• VVT-i Cam Gear Rattle on Cold Start 🟡 Low — Very common across the 2GR-FE engine family, especially on higher mileage vehicles. A brief (~1 second) rattle is often considered 'normal' by many owners, but can be a precursor to VVT gear failure. (Ref: T-SB-0094-09)
• Timing Cover Oil Leak 🟠 Medium — Can occur on higher mileage engines (100k+ miles). It is a slow seep that is expensive to fix due to the high labor cost of removing components to access and reseal the cover.
• Steering Column Rattle/Noise 🟡 Low — A number of owners report a rattle or clunk from the intermediate steering shaft when turning or going over bumps. Not a safety issue but can be an annoyance. (Ref: T-SB-0005-11)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used Oil Control Valve (OCV) is generally not recommended. The cost of a new, reliable aftermarket part from an OEM supplier like Aisin or Denso is low enough that the risk of getting a used, sludged-up part from a junkyard isn't worth the small savings. A used part only makes sense for ancillary components like a wiring connector or mounting bolt if they were damaged during repair.

Donor-vehicle mileage cap: roughly under 100000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• If considering a used OCV, ask the salvage yard if the donor vehicle's oil cap can be removed.
• Look for any signs of thick, black sludge on the underside of the oil cap, which indicates poor maintenance and a high likelihood the OCV is also contaminated.
• Prioritize parts from vehicles in dry climates to minimize the risk of corrosion on electrical connectors.

OEM-only on this vehicle (don't cheap out):

• VVT-i Camshaft Gear (Phaser): If this component fails, using a new OEM part is critical. Aftermarket or used phasers are a significant gamble for a labor-intensive job.

Aftermarket brands forum-validated for this vehicle:

• Aisin (OEM supplier)
• Denso (OEM supplier)
• NTK (NGK)

Brands owners have reported issues with on this vehicle:

• Unbranded, low-cost solenoids from online marketplaces like Amazon or eBay are frequently reported by users on forums to fail quickly or be dead-on-arrival.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0021 — The intake-side equivalent for Bank 2; if you swap a faulty exhaust OCV with an intake OCV, P0024 will often turn into P0021.
• P0014 — The Bank 1 equivalent to P0024, indicating the exhaust camshaft on the rear bank is over-advanced.
• P0011 — A related VVT timing code often cited in TSBs alongside P0024 regarding VVT system malfunctions.
• P0012 — Another VVT-i system code related to timing over-retarded, often appearing when oil pressure or OCV issues affect the 2GR-FE.

Frequently Asked Questions