What an intermittent ground fault actually means here
Your EV charger has a small brain inside it called a CCID (charge circuit interrupting device). Its whole job is to watch for current leaking to ground and shut down fast if it sees any.
When you get an "intermittent ground fault" error, that brain is catching something. The word intermittent is the clue: it comes and goes, which points at a condition that changes, like moisture, temperature, or a connection that shifts.
Here's the reassuring part. Most of these are nuisance-level causes, not a house-on-fire emergency. That's why we rate this low urgency.
Here's the honest part. Low urgency doesn't mean ignore it. A few of these causes (a loose ground, a nicked cable) are genuinely dangerous if they go unaddressed, so you do need to run down the source.
The usual suspects, ranked
After enough of these calls, a pattern emerges. Moisture wins by a landslide.
Garage and outdoor chargers pull in humidity, condensation, and the occasional splash from a wet car. Water finds its way onto the connector pins and creates a tiny leakage path. The charger sees it, faults, and then clears itself once things dry.
Second most common is a loose neutral or ground somewhere on the circuit. Terminals back off over months of heat cycling. The connection gets flaky, the ground reference gets noisy, and the charger throws a fault when the contact shifts.
After that, it's a mix: an aging or twitchy CCID, a nuisance trip coming from the car itself, or (less often) a GFCI breaker fighting the charger's internal protection.
The rare but serious one is physical cable damage. A pinched or chewed conductor leaks current as the cable flexes, and cold weather makes it worse. That one you never tape over.