The 5 Charger Screens That Confuse Everyone

Charger screens were designed for technicians, not for drivers. The messages come from OCPP, a protocol built for charger-to-backend communication. Nobody rewrote them for the person standing outside in February trying to get home.

Consumer Reports found that hardware issues make up 36% of all public charging problems. Of those, 76% involve screens that are broken, unresponsive, or showing error messages drivers cannot interpret. EVcourse app data tells the same story: confusing interfaces are one of the most common reasons drivers report a bad session. And even though reported charger uptime is 98-99%, only about 71% of first-time charging attempts actually succeed. The gap is real.

Here are the five screens that cause the most confusion, what they actually mean, and what to do.

You plug in, the screen says "Preparing" or "Connecting," and nothing happens. You wait a minute. Two minutes. Still preparing. This is the single most common confusing charger screen.

What it means: Your car and the charger are trying to negotiate voltage, current, and safety parameters. This handshake normally takes 5-30 seconds. When it gets stuck, it usually means the communication link between the car and the charger failed silently.

What to do: Unplug, wait 10 seconds, and plug in again. Make sure the connector clicks firmly into your charge port. If it happens again, try a different stall. A cold battery can also extend this phase significantly, especially below minus 10 degrees Celsius.

When to walk away: If it stays on "Preparing" for more than three minutes after two attempts, the charger likely has a backend issue. Move to a different station.

This one sounds alarming, and it should get your attention, but it is not as scary as it sounds.

What it means: The charger detected a tiny amount of electrical current leaking to ground through an unintended path. This is a safety mechanism called GFCI (Ground Fault Circuit Interrupter) or RCD (Residual Current Device). It trips to protect you from electrical shock. Common causes: moisture in the connector (rain, condensation), a damaged cable, or an internal charger component fault.

What to do: Unplug. Check the connector and your car's charge port for visible moisture or debris. Wipe them dry if needed. Try again. If it trips again, try a different stall. Do not try to force or override the charger.

When to walk away: If it keeps tripping, the issue is likely inside the charger. Report it through the network's app and use a different station. If you see this on multiple chargers, your car's charge port or onboard charger may have a fault. Have a service center check it.

Perhaps the most confusing message in the OCPP vocabulary. You are plugged in. The charger seems to recognize your car. But the screen says "Suspended" and no power is flowing.

What it means: "Suspended EVSE" means the charger has paused the session from its side. Maybe the grid operator requested a pause, the charger is throttling due to load management, or there is a backend issue. "Suspended EV" means your car told the charger to stop. This happens when the battery reaches its charge limit, the battery management system detects an issue, or the battery is too cold to accept charge.

What to do: If "Suspended EV," check your car's dashboard. The car may have reached your set charge limit, or the battery may need to warm up. If "Suspended EVSE," wait 2-3 minutes, as it may be temporary load management. If it does not resume, unplug and restart the session.

When to walk away: If "Suspended EVSE" persists after a restart, the charger has a problem you cannot fix. Move on.

This error shows up most often on DC fast chargers. You plug in, the charger starts its sequence, and then stops with a communication error.

What it means: PLC stands for Power Line Communication. Your car and the charger exchange data through the charging cable itself. When this communication link breaks, the charger stops the session for safety. Causes include a loose connection, a damaged pin in the connector, temperature extremes (very hot or very cold), or a firmware incompatibility between the charger and your car.

What to do: Unplug, inspect the connector pins (both on the cable and in your car's port) for damage or debris. Plug back in firmly. If it fails again, try a different stall. Cold weather is a common trigger, so if you can precondition your battery before arriving, do it.

When to walk away: If two different stalls at the same station give this error, the station has a problem. If the error follows you to a different station, your car may have a charge port issue. Contact your dealer.

This is the one that drives people crazy. The charger looks fine. The screen is on. It says "Available." You plug in, authenticate, and nothing happens. No error message. No beep. No power. Just silence.

What it means: The charger's screen is running on a separate system from the actual charging hardware. The screen can be "alive" while the power electronics behind it have crashed, lost their network connection, or are in a fault state that the screen is not displaying. Industry data shows that more than one-third of charger failures happen on chargers that appear operational. Reported uptime is 98-99%, but actual first-time charge success rate is only about 71%.

What to do: Try authenticating again (re-tap your card or restart the app session). Unplug, move to a different connector on the same unit if available. Check the network app to see if the station is reporting any issues. Sometimes the backend knows the charger is down even though the screen does not.

When to walk away: If the charger does not respond after two authentication attempts and a replug, it is down. Report it and move on. Do not spend more than 5 minutes troubleshooting a silent charger.

The Pattern: Unplug, Wait, Retry, Move

For all five screens, the troubleshooting flow is the same:

1. Unplug the connector
2. Wait 10 seconds
3. Plug back in firmly until it clicks
4. If it fails again, try a different stall
5. If the whole station fails, move to the next one

Most charger issues are transient. A simple reconnect fixes them more often than you would expect. The key is not to waste too much time. Two attempts, then move.

Frequently asked questions