2024 Volvo XC40 P0456 Code: EVAP Leak on Your New Compact Crossover

P0456 on Your 2024 Volvo XC40

A P0456 code on your 2024 Volvo XC40 indicates the ECM has found a very small leak (0.020-inch equivalent) in the EVAP system. On a new CMA-platform XC40, this is typically minor and warranty-covered.

Likely Causes

1. Gas cap not fully seated (35%) — Click firmly.
2. Software calibration sensitivity (23%) — Updates may adjust thresholds.
3. Factory EVAP connection variance (18%) — A fitting not fully engaged.
4. Purge or vent valve irregularity (12%) — Slightly out of spec.
5. New seal break-in (7%) — Fresh seals needing cycling.
6. Transport artifact (5%) — Connection disturbed.

What to Do

1. Check the gas cap — Reinstall firmly.
2. Volvo dealer visit — Full warranty, zero cost.
3. Software update and repair — Dealer handles everything.

Cost

• Under warranty: $0—covered through 2028 (basic) and 2032 (emissions)
• Gas cap (DIY): $15–$30

Warranty

Your 2024 XC40 carries Volvo's 4-year/50,000-mile warranty through 2028 and federal emissions coverage through 2032.