P0443 — EVAP Purge Control Valve Circuit

What P0443 means

The ECM commanded the EVAP purge solenoid and didn't get the correct circuit response back. This is the wiring and solenoid code, not a flow code — meaning the valve itself may be fine but the electrical path to it has a problem.

Most likely causes (in order)

1. Purge solenoid coil open or shorted — measure resistance (typically 20–30 ohms)
2. Connector corroded, broken pin, or backed-out terminal
3. Wiring harness chafed on chassis or exhaust heat shield
4. Fuse or relay for purge circuit blown
5. ECM output driver (diagnose all else first)

Symptoms you might notice

• CEL on
• possible fuel smell if valve sticks open
• EVAP monitor not completing

What to check first

Measure purge solenoid resistance at the valve connector — 20–30 ohms is typical; infinite resistance (open coil) or near-zero (shorted coil) means replace the valve. If resistance is normal, check for 12V supply on one pin and ECM ground-switching on the other.

Repair cost & difficulty

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