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P0443 on a 2017 Honda Civic

EVAP Purge Valve Circuit Fault

P0443 on a 2017 Honda Civic indicates evap purge valve circuit fault. It usually stays drivable short-term but should be diagnosed promptly. The most common cause is failed evap purge valve solenoid (open or shorted coil) (typically $80–$300). Confirm the root cause before replacing parts.

Severity: low Safe to drive (short term) Compact Sedan

Reviewed by MECH AI Editorial · Last verified · Includes 20 active NHTSA TSBs

What does P0443 mean on a 2017 Honda Civic?

P0443 is an electrical code. The ECM drives the EVAP purge control solenoid and monitors that circuit; when the voltage or current it measures does not match what the commanded state should produce — an open coil, a short to ground, or a short to power — P0443 sets. It says nothing about whether vapor is actually flowing, which is what P0441 measures. P0443 means the circuit itself is not electrically healthy, so the test starts with a multimeter rather than a smoke machine.

The symptoms, causes, and diagnostic steps below describe P0443 itself, so they read the same on nearby Honda Civic model years. Powertrain and trim details vary year to year — confirm the specifics against your own vehicle before buying parts.

Is it safe to drive a 2017 Honda Civic with P0443?

In most cases a 2017 Honda Civic stays drivable for short trips with P0443 active, but diagnose and repair it promptly. This is a low-severity code — ignoring it can lead to further damage or a failed emissions test.

What are the symptoms of P0443 on a 2017 Honda Civic?

What causes P0443 on a 2017 Honda Civic?

Cause Likelihood Estimated repair (USD)
Failed EVAP purge valve solenoid (open or shorted coil) Most common $80–$300
Damaged or corroded wiring / connector at the purge valve Common $50–$250
Blown fuse feeding the purge solenoid circuit Cheap to check and cheap to fix — do it before ordering a solenoid. Occasional $5–$30
Aftermarket purge valve with a coil resistance outside the ECM's expected range Occasional $80–$300
Failed PCM driver for the purge solenoid Rare $400–$1,500

Cost ranges are editorial estimates for parts and labor at an independent U.S. shop — not quotes. What you actually pay moves with your region, the shop's hourly rate, which engine you have, and how much diagnostic time the job takes. Dealer service departments typically sit above these ranges.

How to diagnose this on a 2017 Honda Civic

  1. Locate the purge valve and inspect the connector

    On most vehicles the purge solenoid sits in the engine bay, in the hose run between the charcoal canister and the intake manifold. Unplug it and inspect for green corrosion, spread pins, or oil and coolant intrusion. Engine-bay connectors bake for years; a bad connector is far more common than a bad PCM.

    Tools: Connector unlock tool, Flashlight, Electrical contact cleaner

  2. Measure the solenoid coil resistance

    With the connector off, measure across the two solenoid terminals. Most purge solenoids read somewhere in the tens of ohms — check the service manual for the exact figure for this vehicle. An infinite reading means an open coil. A near-zero reading means a shorted coil, and it will often take the fuse with it.

    Tools: Multimeter, Wiring diagram

  3. Check for supply voltage and a PCM-side ground

    Purge solenoids are normally fed battery voltage on one side and switched to ground by the PCM on the other. Key on, back-probe the supply wire — you should see battery voltage. Then confirm the PCM pulls the other side to ground when purge is commanded. Missing supply voltage points upstream at the fuse or the relay, not at the valve.

    Tools: Multimeter, Back-probe pins, Wiring diagram

  4. Check the fuse that feeds the circuit

    Find the fuse for the EVAP / emissions circuit in the underhood box and test it with a test light rather than trusting a visual check. If a replacement fuse blows immediately, you have a hard short — usually a chafed wire or a shorted solenoid coil, not a PCM problem.

    Tools: Test light or multimeter, Replacement fuse

  5. Command the valve with a bidirectional scan tool

    With the connector plugged back in, command the purge valve on and off while listening at the valve body. A healthy solenoid clicks crisply each time. Silence with confirmed voltage and ground at the connector means the solenoid is dead internally.

    Tools: Bidirectional scan tool with EVAP purge command

Known Technical Service Bulletins for the 2015-2019 Honda Civic

Manufacturers publish Technical Service Bulletins (TSBs) when a known issue affects a specific vehicle. These bulletins come from the NHTSA database for your Honda Civic.

+14 more TSBs available in MECH AI's TSB explorer for this vehicle.

NHTSA complaints & recalls for the 2017 Honda Civic

Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2017 Honda Civic. Use these to gauge how common a problem is on your specific vehicle before you start chasing Honda Civic diagnostics.

569 owner complaints
22 involved a crash
6 involved a fire
11 reported injuries
  • ENGINE 65
  • STEERING 161
  • UNKNOWN OR OTHER 160
  • ELECTRICAL SYSTEM 99
  • SERVICE BRAKES 35

6 active recalls

  • STEERING:ELECTRIC POWER ASSIST SYSTEM Sep 2018

    Honda (American Honda Motor Co.) is recalling certain 2017-2018 Honda Civic and CR-V vehicles. The magnet that controls the torque sensor output signal for the electronic power steering system may not be properly secured, allowing the magnet to become dislodged. During a full…

    NHTSA campaign 18V663000
  • EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL Nov 2018

    Honda (American Honda Motor Co.) is recalling certain 2017-2018 Honda Civic Hatchback and Civic Type R vehicles. The owners guide in these vehicles may not have been included or if included, the owner's guide may not have been properly provided required information. As such, t…

    NHTSA campaign 18V817000
  • AIR BAGS Apr 2018

    Honda (American Honda Motor Co.) is recalling certain 2017 Honda Civic Hatchback and Civic Type R vehicles. Driver and front passenger seatback pads sold as replacement service parts were made without slit openings for the seat-mounted side air bags. In the event of a crash nece…

    NHTSA campaign 18V266000
  • POWER TRAIN:DRIVELINE:DRIVESHAFT Nov 2017

    Honda (American Honda Motor Co.) is recalling certain 2017 Honda Civic Sedan and Coupe vehicles. The right halfshaft may have been improperly heat treated, reducing its strength.…

    NHTSA campaign 17V706000

How do I fix P0443 on a 2017 Honda Civic?

Engines in the 2017 Honda Civic

The 2017 Honda Civic was offered with the 1.5L 4-cylinder and 2.0L 4-cylinder engines. Which one you have changes where P0443 is most likely to originate, so confirm your engine before ordering parts.

Engine data: EPA fueleconomy.gov.

P0443 vs P0441

These two get confused constantly, and they lead to different repairs:

If both set together, fix the electrical fault first. A solenoid that cannot be driven obviously cannot flow, so P0441 will often clear on its own once P0443 is resolved.

Test the circuit before you buy the valve

The purge solenoid is one of the most-replaced parts in the EVAP system, and a fair number of those replacements do not fix anything. Two ten-minute measurements — coil resistance at the valve and supply voltage at the connector — tell you whether the problem is the part or the wiring feeding it. The valve is cheap enough that guessing is tempting; the wiring repair you skipped will set the code again in a week.

Aftermarket parts and circuit codes

The ECM on many modern vehicles measures the actual current through the solenoid, not just whether the circuit is complete. A cheap aftermarket valve with a coil resistance outside the OEM window can draw the wrong current and set P0443 while working mechanically. If P0443 appeared shortly after someone installed a non-OEM purge valve, that valve is the first thing to suspect.

Living with P0443

The car drives normally in most cases, and the fault does not damage anything mechanically. What it does do is guarantee an emissions failure and prevent the EVAP monitor from ever completing. There is no urgency in the “pull over now” sense — but it is not going to fix itself either, and vapor that should be burned in the engine is being vented instead.

P0443 on a 2017 Honda Civic: frequently asked questions

What does diagnostic trouble code P0443 mean on a 2017 Honda Civic?

P0443 is an electrical code. The ECM drives the EVAP purge control solenoid and monitors that circuit; when the voltage or current it measures does not match what the commanded state should produce — an open coil, a short to ground, or a short to power — P0443 sets. It says nothing about whether vapor is actually flowing, which is what P0441 measures. P0443 means the circuit itself is not electrically healthy, so the test starts with a multimeter rather than a smoke machine.

What are the symptoms of P0443 on a 2017 Honda Civic?

Check Engine Light is illuminated. Often no drivability symptoms at all. Rough idle or stalling if the solenoid has failed in the open position. Hard start after refueling (solenoid failed open). EVAP readiness monitor will not complete. Vehicle will fail emissions / smog testing

What causes P0443 on a 2017 Honda Civic?

Failed EVAP purge valve solenoid (open or shorted coil) (most-common). Damaged or corroded wiring / connector at the purge valve (common). Blown fuse feeding the purge solenoid circuit (occasional). Aftermarket purge valve with a coil resistance outside the ECM's expected range (occasional). Failed PCM driver for the purge solenoid (rare)

Is it safe to drive a 2017 Honda Civic with P0443?

In most cases a 2017 Honda Civic stays drivable for short trips with P0443 active, but it should be diagnosed and repaired promptly — this is a low-severity code. Ignoring it can lead to further damage or a failed emissions test.

Related diagnostic codes

P0443 on other Honda Civic model years