P0024 on 2022-2025 Genesis GV70 3.5T: Exhaust Cam Timing Causes and Fixes

What's Unique About the 2022-2025 Genesis GV70

The GV70's 3.5L 'Smartstream' twin-turbo V6 has a sophisticated CVVT system that is highly sensitive to engine oil quality and pressure. Unlike some more severe mechanical issues, timing codes like P0024 on this modern engine are very frequently traced back to simple maintenance issues like overdue oil changes or oil sludge affecting the system's hydraulic actuators (the Oil Control Valves). Because turbocharged engines can degrade oil more quickly, sticking to the recommended oil change intervals with high-quality synthetic oil is critical. Furthermore, Genesis has issued a TSB for an ECM update that can fix overly sensitive P0024 fault logic, highlighting a potential software cause.

Symptoms You May Notice

• Check Engine Light is on
• Rough or unstable idle
• Reduced engine power and sluggish acceleration
• Hesitation when pressing the throttle
• Decreased fuel economy
• Engine may stall at low speeds
• Hard starting condition

Most Likely Causes

1. Low, Dirty, or Incorrect Viscosity Engine Oil 🔴 High Probability The CVVT system is entirely dependent on oil pressure to function. The Smartstream engine's performance and turbocharging can degrade oil, and any sludge, low level, or incorrect viscosity directly impairs the ability of the cam phasers to adjust timing correctly.
   How to confirm: Check the engine oil dipstick. The oil level should be full, and the oil should be amber/brown and translucent, not black, thick, or gritty.
   Typical fix: Perform an engine oil and filter change using a high-quality full synthetic oil that meets Genesis specifications (typically 0W-30 or 5W-30) and an OEM filter. Genesis offers complimentary maintenance for 3 years/36,000 miles which may cover this.
   Est. part cost: $60-$120
2. Faulty Bank 2 Exhaust Oil Control Valve (OCV/VVT Solenoid) 🟡 Medium Probability → Shop Engine Variable Valve Timing (VVT) Solenoid This solenoid is the most common hardware failure for CVVT-related codes. It can become clogged with oil debris or fail electronically, causing it to stick and prevent proper oil flow to the cam phaser. Before replacing, ensure TSB 23-EM-004H for an ECM update has been performed, as it addresses fault logic for this code.
   How to confirm: A common and effective diagnostic step is to swap the Bank 2 exhaust OCV with the Bank 2 intake OCV (if they are the same part). Clear the codes and drive. If the code changes to P0021 (Intake Camshaft Position Timing Over-Advanced Bank 2), the OCV is confirmed to be faulty.
   Typical fix: Replace the Bank 2 (driver's side) exhaust Oil Control Valve.
   Est. part cost: $100-$250
3. Faulty Bank 2 Exhaust Camshaft Position Sensor (CMP) ⚪ Low Probability → Shop Engine Camshaft Position Sensor
   How to confirm: If an oil change and OCV replacement or swap do not resolve the issue, the sensor may be sending inaccurate data. Its signal can be checked with an oscilloscope. Swapping it with the sensor from another camshaft (e.g., Bank 1 exhaust) is another way to see if the code follows the sensor.
   Typical fix: Replace the Bank 2 (driver's side) exhaust camshaft position sensor.
   Est. part cost: $100-$180

Rare But Worth Checking

• Stretched Timing Chain or Failed Camshaft Phaser: → Shop Engine Timing Chain This is a major mechanical failure that is much less common than oil or solenoid issues. It would typically be accompanied by other symptoms like a rattling noise on startup. This should only be considered after all other common causes have been ruled out.

Diagnosis Steps

1. Check for TSBs: Ask a dealer or use a subscription service to check if TSB #23-EM-004H ('ECM LOGIC IMPROVEMENT FOR DTC P0014/P0024') applies to your VIN. An ECM software update may resolve the issue without any parts replacement.
2. Check Engine Oil: Verify the oil level is full and the condition is clean. If low or dirty, perform an oil and filter change, clear the code, and see if it returns. This is the most common fix.
3. Scan for Other Codes: Use an OBD-II scanner to see if other codes are present. Codes for other camshafts (P0014, P0021, P0011) point towards a systemic oil issue.
4. Inspect Wiring: Visually check the wiring harness and connector for the Bank 2 (driver's side) exhaust OCV and camshaft position sensor. Look for damage, corrosion, or loose connections.
5. Test/Swap the Oil Control Valve (OCV): The most effective DIY test is to swap the Bank 2 exhaust OCV with the Bank 2 intake OCV. Clear the codes and drive. If the fault moves to the intake cam (P0021), the OCV is bad and needs to be replaced.
6. Test the Camshaft Position Sensor (CMP): If the OCV is confirmed good, the sensor itself can be tested. An advanced scan tool can monitor its live data, or it can be swapped with another sensor to see if the code follows.
7. Seek Professional Diagnosis: If none of the above steps resolve the issue, the problem may be more severe, such as a timing chain or phaser issue, which requires professional diagnosis.

Parts You'll Likely Need

• Engine Oil Control Valve (VVT Solenoid) (OEM #24375-3L300) — This is the most common hardware component to fail, either by getting clogged with oil sludge or failing electronically. Its failure is a frequent cause of P0024 after oil issues are ruled out.
  Trusted brands: Hyundai/Genesis Genuine
  OEM price range: $100-$250
  Aftermarket price range: $70-$150
• Engine Oil and Filter — Low, old, or incorrect-viscosity oil is the leading cause of all CVVT-related trouble codes on this engine.
  Trusted brands: Genesis OE Filter, Mobil 1, Pennzoil Platinum
  OEM price range: $25-$40
  Aftermarket price range: $15-$30
• Camshaft Position Sensor (OEM #39318-3L100) — A less common failure, but can be the cause if the OCV and oil are confirmed to be good. This part is confirmed to fit the 3.5T engine. 🎬 Watch: How to replace a camshaft position sensor
  Trusted brands: Hyundai/Genesis Genuine
  OEM price range: $100-$180
  Aftermarket price range: $60-$120

Related Codes That Often Appear With This One

• P0014 — This is the identical code for Bank 1 (passenger side). If both P0014 and P0024 are present, it strongly suggests a problem common to both banks, like low/dirty engine oil or low oil pressure.
• P0021 — This is the code for the intake camshaft on the same bank (Bank 2). It can appear if there's a widespread oil delivery issue on that side of the engine, or it can be intentionally triggered during diagnosis by swapping the intake and exhaust OCVs.
• P0300, P0302, P0304, P0306 — These are cylinder misfire codes for Bank 2. If the cam timing is sufficiently incorrect, it can lead to poor combustion and trigger misfires on that bank.

Technical Service Bulletins (TSBs) & Recalls

• TSB #23-EM-004H: Titled 'ENGINE CONTROL MODULE (ECM) LOGIC IMPROVEMENT FOR DTC P0014/P0024'. This bulletin involves a software update for the ECM to refine the diagnostic logic for these codes, potentially preventing false positives.

Platform-Specific Known Issues

• Owner Experience: OCV Replacement Under Warranty: A user on gv70forum.com with a 2022 GV70 3.5T reported the P0024 check engine light appeared around 20,000 miles. The dealership first performed an oil consumption test which passed, then proceeded to replace the Bank 2 exhaust Oil Control Valve (OCV) under warranty, which successfully resolved the code.
• Dealer Fix on G80 3.5T Platform Mate: On the genesisowners.com forum, a 2021 G80 3.5T owner with code P0024 reported the dealer checked the oil level, found it to be correct, and proceeded directly to replacing the Bank 2 OCV under warranty to fix the problem, indicating this is a common and recognized failure pattern for service technicians.

Mechanic-Grade Diagnostic Values

• Oil Control Valve (OCV) Coil Resistance — expected: 6.7 to 7.9 Ω at 20°C (68°F).. Failure: A reading significantly outside this range, or showing an open circuit (infinite resistance), indicates a faulty solenoid coil.
• ECM Diagnostic Trigger Condition — expected: The ECM sets DTC P0024 if the absolute difference between the target CVVT angle and the actual CVVT angle is greater than 6 degrees for 2 seconds, and this condition is met more than 5 times.. Failure: This is the internal logic that triggers the code; it is not a direct measurement but is useful for understanding scan tool data.
• OCV Connector Voltage (Key On, Engine Off) — expected: One pin should show battery voltage (approx. 12V).. Failure: No voltage suggests a problem in the wiring harness, a blown fuse, or an issue with the power supply from the ECM.

Scan Tool Commands That Help

• Genesis GDS (Global Diagnostic System) or equivalent professional scan tool: CVVT Actuator Test / OCV Active Test — This bidirectional command is used to manually activate the Bank 2 exhaust OCV solenoid. When triggered at idle, a properly functioning OCV and phaser will cause a noticeable change in engine RPM or may even cause a stall. If the command is sent and no change in engine operation occurs, it strongly points to a failed OCV, a clog in the oil passage, or a seized cam phaser.

OEM Part Supersession History

• 24375-3L300 → No common supersession noted. — This part number appears to be stable for the specified model years.
• 39318-3L100 → No common supersession noted. — This part number appears to be stable for the specified model years.

Model Year Variations Within This Range

• 2022-2025: No significant changes to the 3.5L Lambda III twin-turbo engine, CVVT system, or related components that would affect the diagnosis of P0024 have been documented for this model year range. The primary causes and fixes remain consistent.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Rear Differential Whine/Hum 🟠 Medium — A widely reported issue, often noticeable between 40-60 mph under light throttle. Can occur at low mileage. (Ref: TSB 23-DS-004G instructs dealers to first re-torque a pinion nut, and if that fails, replace the entire rear differential assembly.)
• Infotainment System Glitches 🟡 Low — Owners report occasional freezing, random reboots, or failures of the backup camera display. Usually resolved by a system reset (turning the car off and on).
• Low-Pressure Fuel Pump Failure 🔴 High — Affects certain 2022-2023 models. A faulty impeller can cause the pump to shut down, leading to a loss of drive power. (Ref: Recall 022G (NHTSA 23V-612) was issued to inspect and replace the low-pressure fuel pump assembly.)
• Exploding Seat Belt Pretensioners 🔴 High — A defect can cause front seat belt pretensioners to deploy abnormally and explode in a crash, projecting metal fragments. (Ref: Recall 22V-930 (and others) was issued for this widespread Hyundai/Genesis issue affecting 2022-2023 models.)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific repair, sourcing a used part is generally not recommended. The primary failure modes for the Oil Control Valve (OCV) are electronic failure or internal clogging from oil sludge. A used part carries a high risk of having the same issues or a very short remaining service life.

Donor-vehicle mileage cap: roughly under 20000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• If considering a used OCV, it should only be from a very low-mileage vehicle with a verifiable history of regular, on-time oil changes.
• Inspect the screen on the used solenoid for any signs of metallic debris or thick, black sludge. If it's not perfectly clean, do not buy it.

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

• Engine Oil Control Valve (VVT Solenoid)
• Camshaft Position Sensor
• Engine Oil Filter

Aftermarket brands forum-validated for this vehicle:

• For engine oil, brands meeting Genesis specifications like Mobil 1 or Pennzoil Platinum are widely accepted.

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white-box' OCV solenoids and sensors from online marketplaces like Amazon or eBay should be avoided. These parts often have high failure rates and may not meet the precise operational tolerances required by the Genesis CVVT system, leading to the code returning quickly.

Real Owner Stories

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

Related OBD-II Codes

• P0014 — The Bank 1 equivalent to P0024; it indicates the exhaust camshaft timing on the opposite bank is over-advanced, often sharing the same root cause of oil quality or OCV failure.
• P0021 — Refers to Intake Camshaft Position Timing Over-Advanced on Bank 2; this code often appears during diagnostics if the Bank 2 exhaust OCV is swapped with the intake OCV to test for hardware failure.
• P0011 — Indicates Bank 1 intake camshaft timing issues; when appearing alongside P0024, it suggests a systemic oil pressure or contamination issue affecting multiple cam phasers.

Frequently Asked Questions