Solving P0455 on Your 2019 GMC Acadia
P0455 on your 2019 Acadia means a large EVAP leak. Your 2.5L, 3.6L V6, or 2.0L turbo is unaffected. Check for P0449 companion code. Gas cap first.
Symptoms
- Check engine light with P0455
- P0449 may also appear
- Fuel smell possible
- Emissions test failure
Causes by Likelihood
- Gas Cap Seal (Very High Likelihood): Degraded. $10–$20.
- Vent Valve Solenoid (Medium Likelihood): GM vent valve. $90–$200 installed.
- Purge Solenoid (Medium Likelihood): Age-related. $100–$220 installed.
- Vapor Hose (Low Likelihood): Heat damage. $70–$190.
- Charcoal Canister (Low Likelihood): Saturated. $170–$350 installed.
Warranty
Basic warranty (3yr/36k) has expired. Federal emissions (8yr/80k) covers EVAP through 2027.
Safe to Drive?
Yes. P0455 is vapor only.