2017 GMC P0440: What It Means & Is It Safe to Drive?
P0440 on the 2017 GMC: Evaporative Emission System Control System Malfunction. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes on the 2017 GMC
- Gas cap loose or faulty
- Purge or vent valve stuck
- Charcoal canister or hose leak
Symptoms
- Check Engine Light
Typical fixes
- Replace gas cap
- Test purge/vent valves
- Smoke test EVAP system
Repair cost range
For a 2017 GMC, repairs for P0440 typically fall between $20 and $400, depending on the root cause and labor rates in your area.
Known issues on GMC
GMC P0440 on Sierra and Yukon trucks typically traces to a cracked EVAP purge solenoid hose near the intake manifold or a gas cap seal. These trucks share the same EVAP architecture as Chevrolet Silverado and Tahoe—purge solenoid hose inspection is the first step.
Most commonly affected models
Sierra 1999–2007Yukon 2000–2006Terrain 2010–2017