P2065 Fuel level sensor: circuit fault ("B")

By: Diagno editorial team · Updated: 2026-10-15

P2065 means: Fuel level sensor: circuit fault ("B"). A float in the tank measures the fuel level and passes it to the gauge and the engine computer. OK to drive, but have it checked soon. The most common repair costs about €45–90 in Estonia, depending on make and model.

What it means

A float in the tank measures the fuel level and passes it to the gauge and the engine computer. The computer found a fault in the electrical circuit: the part, a wire, a connector or a fuse.

What you may notice

• Fuel gauge wrong or jumping
• Engine light on

What could be wrong

1. 1Connector loose, damp or corroded · Wiring or connector repair €45–90
2. 2Wire broken or chafed · Wiring or connector repair €45–90
3. 3Faulty fuel level sender · Sensor replacement €80–160
4. 4Engine computer fault (rare) · Control unit check and software €150–300

Repair difficulty: Moderate

What you can check yourself

First look at the connector and wiring: anything loose, melted or green with corrosion? Until it's fixed, keep track of your mileage so you don't run out of fuel. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

1. We read the fault data on the diagnostic tool and check whether the fault is constant
2. We measure the circuit's supply, ground and signal
3. We repair the wire or replace the connector
4. If the wiring is fine, we replace the fuel level sender

Standard SAE description: Fuel Level Sensor "B" Circuit