Auxiliary Emissions ControlOBD2 Codes

P0443 – Meaning, Causes, Symptoms, & Fixes

What Does Code P0443 Mean?

  • P0443 definition: Evaporative Emission Control System Purge Control Valve Circuit Malfunction
  • Issue Severity: LOW – Continued driving for a short period of time is okay.
  • Repair Urgency: Get this fixed within the next month.
  • Diagnosis: This trouble code severely impacts the drivability of your vehicle. The most common problems consist of increased engine stalling, rough engine idle, lowered fuel economy, and rattling/knocking noises from the engine. Continuing to drive the vehicle in this condition can cause severe damage to multiple internal engine components.

Find a Certified Shop

We've partnered with RepairPal to recommend trustworthy shops in your area. Enter your details to see certified shops near you that offer upfront estimates, guaranteed fair pricing, and a minimum 12-month, 12,000-mile warranty.














The evaporative control (EVAP) system collects raw fuel escaping from the fuel tank. This information is then communicated to the ECM which regulates the emissions of the vehicle. The P0443 code is set when the ECM detects a malfunction within the purge control valve or a short in the purge valve circuit.

P0443 Causes

  • Short in control circuit wiring
  • Short in purge valve wiring
  • Faulty vent valve solenoid
  • Faulty purge valve solenoid
  • Faulty ECM

P0443 Symptoms*

*No noticeable adverse conditions in some cases

How Do I Fix Code P0443?

With a P0443 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction related to the EVAP system. Using the live data function of the FIXD sensor and app allows you to read and analyze engine data to properly diagnose a P0443 code.

If the sensors are all reading correctly and you’re not comfortable further diagnosing this issue at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs. 

These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.

> Find a RepairPal Certified Shop Near You

How Much Does It Cost to Fix Code P0443?

If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0443 code.

Right shop, right price

We've partnered with RepairPal to recommend certified and trustworthy shops in your local area. 

  • Upfront cost estimates
  • Minimum 12-month, 12,000-mile warranty
  • Fair price guarantee

Possible Repair Costs for P0443

When it comes to making repairs associated with the P0443 code, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • EVAP purge solenoid: $
  • ECM: $

DIY Steps to Diagnose Code P0443

If you’d like to try to fix code P0443 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Complete diagnosis may require some specialized equipment beyond what the FIXD Sensor can provide, but for the most part, this diagnosis and repair can be attempted by beginner DIYers. 

DIY difficulty level: Beginner

This repair can be attempted by beginner DIYers.

Tools/parts needed:

STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.

Scan your vehicle to verify P0443 is the only code present. If other codes are present, they must be addressed first.

STEP 2: INSPECT GAS CAP. 

Check your gas cap to see if it is loose or damaged. If your gas cap is loose, tighten it and clear the code. Inspect your gas cap for physical damage or deterioration. However, it should be noted that damage to the gas cap or deterioration of its components is not always noticeable. If your gas cap was not loose and you do not see any indications of failure, try replacing the gas cap anyway and clearing the codes. Gas caps are relatively inexpensive and are often the fix for codes related to the EVAP system.

STEP 3: CHECK FREEZE FRAME DATA.

Using FIXD, monitor the fuel tank pressure readings to ensure the fuel tank pressure sensor is properly functioning. The fuel tank pressure sensor provides the primary feedback on engine leaks to the EVAP system of your vehicle.

STEP 4: INSPECT WIRING.

Visually inspect the wiring around the purge valve circuit for damage or disconnection.

STEP 5: CONSULT A PROFESSIONAL.

If at this point the vehicle is still setting the same code, you may have a more serious problem with your car’s EVAP system, and you should bring the vehicle to a certified shop to have further diagnostic work performed.  

Common P0443 diagnosis mistakes

Prematurely replacing any component when the issue can be resolved by changing the oil and filter and adjusting the oil level to the correct level per your vehicle’s manufacturers specifications.

Still Need Help Fixing Code P0443?

If you’ve followed the steps above and are still experiencing issues with the oxygen sensor system and code P0443, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.

Jeffrey-Ross

Lifelong automotive enthusiast with a soft spot for offroading. Wrencher turned writer, but I still love to tinker on just about anything with an engine. Dream car: tie between a ‘71 Hemi ‘Cuda and a ’91 GMC Syclone. #GirlDad #SaveTheManuals

Jeffrey N. Ross
Lifelong automotive enthusiast with a soft spot for offroading. Wrencher turned writer, but I still love to tinker on just about anything with an engine. Dream car: tie between a ‘71 Hemi ‘Cuda and a '91 GMC Syclone. #GirlDad #SaveTheManuals

You may also like

14 Comments

  1. I have an 04 dodge ram with a 5.7 L engine. I’ve replaced the purge valve solenoid, the leak detector valve and the gas cap. My code p0443 still comes up.
    The vehicle has 208,000 miles. Any suggestions on what to check next?

    1. Check wiring, follow the wires back and see if they are melted together anywhere. IF you have access to a multimeter test for continuity or voltage and verify it’s as it should be. Check that all hoses are fully seated and not cracked on the side you cannot see. Good luck

    2. I have a 2014 Ford Focus titanium. Showing code P0443 . I’ve replaced the evap purge solenoid but light still comes on. I’ve checked the ohms of the purge valve it reads 16.2, is that low for resistance, and I also checked the vent valve on the Evap canister it reads 37 Ohms . I’m stumped.

    3. I replaced the the top hose on my wife’s Explorer and cut about an inch of the bottom hose. I then added a water hose clamp to the bottom hose to make sure it was getting a good seal. Gas milage increased 5 mpg in the city and appears be idling better.

  2. Hi I tried everything test both wires from the purge valve when the ignition is of I got reading from one when it should be both. Also test for continually it was ok from the purge vvalve to the com with a multimeter can you please tell me what to look for thank you

    1. 2003 chevy tahoe, p0443 & p0455 codes come up together, changed the evap purge control 2 times, any help

      1. I have the same problem..have u figured your if so can u help me

  3. I have a 2001 BMW 740iL. The PO443 code comes up. I also have a catalytic converters issue and several bank misfires. What can I do and does any of this connected with the code? I know nothing about under the hoods of cars.

    1. I also have a 2001 bmw 740 and have the same code I replaced some vacuum lines and it went away for awhile or just a coincidence,and came back but I also have a little leak in the exhaust by the cat on passenger side.I cannot figure it out if you find anything let us know please thank you..and if I do I will let you know…oh and I had cam sensor code before this changed cam sensors ,then I started getting these codes….

  4. Thank you I have same issue with a 2007 Ram

  5. Where is purge control valve located on E-450 superduty v10 6.8 L engine

  6. I have a 2002 Sable with a 3.0 Duratec v-6 and the check engine light still comes on after
    purge valve replacement – what else can i do ?

    1. Where is the purge Valve located on 2006 Acura TL is and easy fix ! I already replaced fuel cap ?

  7. Where is the purge Valve located on 2006 Acura TL is and easy fix ! I already replaced fuel cap ?

Leave a reply

Your email address will not be published.