Solving P0455 on Your 2019 Chevrolet Equinox
A P0455 on your 2019 Equinox means the ECM detected a large EVAP leak—equivalent to a 0.040-inch or larger opening. Your 3rd-generation Equinox with the 1.5L turbo is out of GM's basic warranty but covered by the federal emissions warranty. Start with the gas cap.
Symptoms
- Check engine light with P0455
- Faint fuel odor near the rear
- Gas cap seal worn after 6+ years
- Emissions test failure
Causes by Probability
- Gas Cap Seal (Very High Likelihood): Worn rubber seal. Replace for $10–$25.
- Vent Valve Solenoid (Medium Likelihood): GM's vent solenoid failing. $100–$200.
- Purge Solenoid (Medium Likelihood): Stuck open. $80–$180.
- Vapor Line Deterioration (Low Likelihood): Rubber hoses cracking with age. $80–$200.
- Charcoal Canister (Low Likelihood): Saturated from overfilling. $200–$350.
Diagnostic Steps
Replace the gas cap ($10–$25), clear the code, drive 2–3 cycles. If P0455 returns, a smoke test will locate the leak. On the Equinox, the vent valve solenoid is near the charcoal canister under the rear.
Warranty Coverage
GM's basic warranty (3 years/36,000 miles) has expired. The federal emissions warranty (8 years/80,000 miles) covers EVAP through 2027. Check mileage with your dealer.
Safe to Drive?
Yes. P0455 doesn't affect the Equinox's engine, transmission, or AWD.