P0463 on a GMC: 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 GMC

On a GMC, 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 GMCs, and its resistor strip wears with age. The engine runs normally; the gauge is what's stuck.

Is P0463 common on GMCs?

P0463 is common on higher-mileage GMCs like the Sierra, Yukon, and Terrain. Sender wear is the usual cause, and the fuel pump module has to come out of the tank to replace it. It's a gauge problem, not a performance problem.

Commonly reported on: Sierra, Yukon, Terrain.

Symptoms

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