P0463 on a Mazda: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

Safe to drive, but the fuel gauge may be wrong — track your miles or fill up often so you don't run out of gas.

What P0463 means on a Mazda

On a Mazda, P0463 means the fuel level sender is sending a signal that's too high, so the computer thinks the tank is full. The sender is part of the fuel pump module on most Mazdas, and its resistor strip wears with age and mileage. The engine runs normally; the gauge is what's stuck.

Is P0463 common on Mazdas?

P0463 is common on higher-mileage Mazdas like the Mazda3, Mazda6, and CX-5. Sender wear is the usual cause, and the module sits in the tank, so replacing it means accessing the pump from inside the car or under the vehicle. It's a gauge problem, not a drivability problem.

Commonly reported on: Mazda3, Mazda6, CX-5.

Symptoms

Check engine light on
Fuel gauge stuck on full
Fuel gauge reads wrong or drops suddenly
No change in how the car drives

Common causes

most common: Worn fuel level sender in the fuel pump module
common: Corroded connector at the fuel pump module
common: Short or damaged wiring in the fuel level circuit
less common: Faulty instrument cluster reading

How to fix it

Fix	DIY?	Typical cost
Check the fuel level sensor wiring and connector	Yes	$0–40
Replace the fuel pump module with sender	Mechanic	$250–550
Repair a short or broken wire in the sensor circuit	Mechanic	$80–200