P0443 on 2010-2015 Hyundai Tucson: EVAP Purge Valve Circuit Malfunction Causes and Fixes

What's Unique About the 2010-2015 Hyundai Tucson

For the second-generation Hyundai Tucson (and its platform-mate, the Kia Sportage), the P0443 code is a very common and straightforward issue. The 2.4L Theta II GDI engine, widely used in this model, has an easily accessible purge valve located on top of the engine near the intake manifold, making diagnosis and replacement simpler than on many other vehicles. There are no widespread, unique design flaws or TSBs for this specific problem on this platform; it's typically a standard case of a component failing with age and heat cycles.

Symptoms You May Notice

• Check Engine Light is on.
• Slightly rough idle or engine hesitation, particularly if the valve is stuck open.
• Minor decrease in fuel economy.
• A faint fuel odor near the vehicle.
• Difficulty starting the engine after refueling (in some cases where the valve is stuck open, flooding the engine with vapors).
• A 'whooshing' sound from the gas tank when removing the cap, indicating pressure issues.

Most Likely Causes

1. Faulty EVAP Purge Control Valve (Solenoid) 🔴 High Probability This is a common failure point on many vehicles due to age and constant use. The internal coil winding can develop an open or short, or the valve can become mechanically stuck from fuel vapor residue.
   How to confirm: After checking the wiring, you can test the valve itself. With the engine off, disconnect the electrical connector and check the resistance across the two pins with a multimeter. 🎬 See how to test the purge valve using a multimeter. A reading between 20-30 Ohms is typical for a good valve. An open circuit (infinite resistance) or a short (near-zero resistance) indicates a bad valve. You can also (carefully) apply 12V power to the pins to see if the solenoid clicks open and closed; no click means it's failed.
   Typical fix: Replace the purge control valve. It is typically mounted on or near the intake manifold with two hoses and one electrical connector.
   Est. part cost: $40-$120
2. Damaged Wiring or Connector 🟡 Medium Probability The wiring harness in the engine bay is exposed to heat and vibration, which can cause wires to become brittle and crack or rub through their insulation over time.
   How to confirm: Visually inspect the wiring harness leading to the purge valve for any signs of cracking, fraying, or rodent damage. Disconnect the connector and check for corrosion, bent pins, or water intrusion. Use a multimeter to check for 12V power on one wire and for continuity to the PCM on the other (ground-side control) wire with the key on.
   Typical fix: Repair the damaged section of wire or clean/replace the electrical connector.
   Est. part cost: $5-$25

Rare But Worth Checking

• Blown Fuse: The EVAP system is often on a shared fuse. While not common for this to be the only component affected, it's a quick and easy check in the fuse box before replacing parts.
• Faulty Powertrain Control Module (PCM): This is a very rare cause. The PCM's internal driver for the purge valve circuit can fail. This should only be considered after the valve and wiring have been definitively ruled out by testing.

Diagnosis Steps

1. Scan for Codes: Use an OBD-II scanner to confirm P0443 is the active code. Note any other codes present, like P0444, P0445, or P0171.
2. Inspect the Purge Valve Connector and Wiring: Locate the purge valve on the engine, near the intake manifold. Visually inspect the electrical connector and nearby wires for any obvious damage, corrosion, or loose connections.
3. Test the Circuit for Power: Disconnect the connector. With the ignition on, use a multimeter to verify that one of the pins in the connector has battery voltage (approx. 12V).
4. Test the Purge Valve Solenoid: With the connector still unplugged, set your multimeter to measure resistance (Ohms) and touch the probes to the two pins on the purge valve itself. A healthy valve should have a specific resistance value (typically 20-30 Ohms). An open circuit (infinite resistance) or a short (zero resistance) indicates a bad valve.
5. Check for a Blown Fuse: Consult the owner's manual to locate the fuse for the EVAP system or emissions components and visually inspect it.
6. Command the Valve On (Advanced): If you have a bidirectional scanner, you can command the purge valve to open and close. You should hear an audible click from the valve. If it doesn't click, and the wiring is confirmed to be good, the valve is faulty.
7. Clear Codes and Test Drive: After performing repairs (like replacing the valve), clear the trouble codes with the scanner and perform a test drive to ensure the Check Engine Light does not return.

Parts You'll Likely Need

• EVAP Vapor Canister Purge Valve / Solenoid (OEM #28910-2E000 or 28910-3C200 (verify by VIN)) — This is the most frequent point of failure for a P0443 code, either due to an internal electrical failure of the solenoid coil or the valve becoming mechanically stuck.
  Trusted brands: Hyundai (OEM), Dorman (911-676), Standard Motor Products (CP816), Beck Arnley
  OEM price range: $60-$100
  Aftermarket price range: $30-$75

Related Codes That Often Appear With This One

• P0444 — This code indicates an 'EVAP Purge Control Valve Circuit Open', which is a more specific version of the P0443 general circuit fault, often pointing directly to a broken wire or failed solenoid coil.
• P0445 — This code indicates an 'EVAP Purge Control Valve Circuit Shorted', another specific fault that falls under the general P0443 category, pointing to a short in the wiring or solenoid.
• P0171 — If the purge valve is stuck open, it can create a vacuum leak, allowing un-metered air (and fuel vapor) into the intake manifold. This can cause the engine to run lean and trigger a P0171 'System Too Lean' code.

Platform-Specific Known Issues

• Common Failure on Theta II Engines: The P0443 code is a well-documented and frequent issue across the Hyundai/Kia lineup for vehicles equipped with the 2.4L Theta II engine, including the Sonata, Optima, and Sportage. The cause is almost always the purge valve itself failing electrically.
• Owner Experience: Simple DIY Fix: Multiple owners on forums like Reddit and Hyundai-Forums confirm that replacing the purge valve for a P0443 code is a beginner-friendly DIY repair that takes less than 30 minutes, requiring only basic tools to remove the engine cover and release the hose clamps and electrical connector.
🎬 Watch: A quick walkthrough of this common Hyundai Tucson fix.

Mechanic-Grade Diagnostic Values

• Purge Control Valve Solenoid Resistance — expected: 20-30 Ω (Ohms). Failure: A reading outside 15-35 Ω, infinite resistance (open), or near-zero resistance (short) indicates a faulty valve coil.
• Purge Valve Connector - Power Supply Pin — expected: Battery Voltage (~11-14 V) with Key On, Engine Off.. Failure: No voltage suggests a blown fuse or an open in the power supply wire.
• Purge Valve Connector - Control Pin (Back-probed) — expected: Near 0V when commanded ON by a scan tool; near battery voltage when commanded OFF.. Failure: Voltage does not change when commanded, indicating a wiring issue to the PCM or a faulty PCM driver.

Scan Tool Commands That Help

• Hyundai GDS (or equivalent bidirectional scanner): EVAP Purge Test / Actuation Test — This function allows the technician to command the purge valve solenoid to open and close manually. It's used to verify if the valve clicks audibly and if the control circuit is functioning correctly by observing voltage changes.
• Hyundai GDS (or equivalent bidirectional scanner): Resetting Adaptive Values — After replacing a component like the purge valve, it can be beneficial to reset the engine control module's adaptive learning values to ensure the system recalibrates with the new part immediately.
• Advanced Scan Tool: Monitor Fuel Tank Pressure (FTP) PID — To test for a mechanically stuck-open purge valve, command the vent valve closed and the purge valve closed (off). If the FTP sensor shows vacuum building in the tank with the engine running, it confirms the purge valve is leaking vacuum from the intake manifold into the EVAP system.

Wiring & Ground Locations

• Canister Purge Control Solenoid Valve — Located on the left side of the engine, near the top of the intake manifold runners on the 2.4L engine.. This is the component and connector that must be tested for the P0443 circuit code.
• Ghg01 (Ground) — Located on the left front of the engine compartment.. A poor ground at this location could potentially affect various engine sensor circuits, including the EVAP system, leading to intermittent electrical faults.
• PCM (Engine Control Module) — Located in the left rear of the engine compartment.. The control wire for the purge valve terminates at the PCM. A continuity check must be performed between the valve connector and the PCM connector if a wiring break is suspected.

OEM Part Supersession History

• 28910-25100 → 28910-2E000 (among others, depending on application) — Part consolidation and potential design updates across multiple Hyundai/Kia platforms.
  Heads up: While many valves look physically similar, using the wrong part number can result in incorrect flow rates or electrical characteristics. The Pass 2 listed part numbers 28910-2E000 and 28910-3C200 are correct for this generation, while 28910-25100 is generally for earlier models. Always verify by VIN.

Model Year Variations Within This Range

• 2011-2013: Some parts catalogs show specific wiring harness options for SULEV (Super Ultra Low Emission Vehicle) vs. non-SULEV models, which could potentially affect EVAP component wiring or PCM logic. This is most relevant when diagnosing complex wiring issues.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used OEM purge valve from a low-mileage donor vehicle is a reasonable choice for this repair. The part is not a major wear item and is easy to access and replace, minimizing labor risk if the used part fails prematurely. Given the high failure rate, a used part is a cost-effective gamble.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Check for cracks or damage to the plastic housing and hose ports.
• Ensure the electrical connector pins are straight and free of corrosion.
• If possible, perform a resistance test on the spot with a multimeter (should be 20-30 ohms).
• Avoid parts from vehicles with obvious signs of engine fire or flood damage.

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

• Powertrain Control Module (PCM) - Due to programming requirements, a used PCM is not a simple plug-and-play solution and should be avoided unless you have access to specialized programming tools.

Aftermarket brands forum-validated for this vehicle:

• Dorman (specifically part 911-676) is a widely available and commonly used aftermarket replacement.
• Standard Motor Products (SMP)
• Beck/Arnley

Brands owners have reported issues with on this vehicle:

• No-name, unbranded parts from online marketplaces may have lower quality control and are a higher risk, though some may function correctly.

Real Owner Stories

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

Related OBD-II Codes

• P0444 — A more specific version of P0443, indicating an 'Open Circuit' in the purge valve control system. This can be caused by a broken wire or a failed-open coil inside the valve solenoid.
• P0445 — A more specific version of P0443, indicating a 'Shorted Circuit' in the purge valve control system. This points to wiring that is shorted to ground or a shorted coil inside the valve solenoid.
• P0171 — A fuel trim code for 'System Too Lean'. This can appear alongside P0443 if the purge valve is mechanically stuck open, creating a vacuum leak that allows unmetered fuel vapor into the intake manifold.

Frequently Asked Questions