P0443
System
Powertrain (EVAP)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Evaporative Emission Control System Purge Control Valve Circuit

Understand P0443, common causes, and the right TOPDON scanner to diagnose it.

Electrical fault on purge valve solenoid circuit.

Common symptoms

  • Check engine light
  • May appear with P0441 or P0455

Typical causes

  • Failed purge solenoid
  • Wiring open/short
  • Blown fuse

What scanner do you need?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose P0443 with a basic code reader?
P0443 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0443?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.