Diagnosing P0455 on Your 2024 Chevrolet Colorado
A P0455 on your 2024 Colorado means the ECM detected a large EVAP leak. Your all-new 3rd-generation Colorado with the 2.7L turbo is fully under warranty. A software update or assembly issue is possible on this new platform alongside the typical gas cap cause.
Symptoms
- Check engine light with P0455
- Possible faint fuel smell
- Gas cap not clicking
- EVAP monitor incomplete
Most Likely Causes
- Gas Cap (Very High Likelihood): Loose or not seated. Tighten until it clicks.
- Software Calibration (Medium Likelihood): New platform may need ECM TSB update.
- Vent Valve Solenoid (Medium Likelihood): Factory defect. Warranty replacement.
- EVAP Line Fitment (Low Likelihood): Assembly issue. Warranty-covered.
- Purge Solenoid (Low Likelihood): Stuck open. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 returns, visit a Chevy dealer. They'll check for TSBs on the new platform and run diagnostics—all free under warranty.
Warranty Coverage
Your 2024 Colorado is covered by GM's 3-year/36,000-mile warranty through 2027 and the federal emissions warranty (8yr/80k) through 2032. Let the dealer handle it.
Safe to Drive?
Yes. P0455 doesn't affect the Colorado's 2.7L turbo, 8-speed, 4x4, or towing.