Fuel Level Sensor "A" Circuit High
What it means
The engine computer has detected that the fuel level sensor signal is above its allowed maximum. This usually means an open in the sensor circuit or its ground, or a worn resistor track that loses contact, so the fuel gauge shows a wrong reading.
Related lights
Dashboard lights that may come on with this code.
Symptoms4
- Fuel gauge stuck at full or empty depending on the vehicle design.
- Check engine light on.
- Low fuel warning sometimes on despite enough fuel.
- Risk of running out of fuel without warning.
Possible causes5
- Open sensor ground wire or a poor ground point.
- Loose or corroded connector on top of the tank.
- Open signal wire between the tank and the computer or instrument cluster.
- Resistor track worn until it loses contact at some levels.
- Signal wire shorted to a voltage source (less common).
How to diagnose5
- Watch the fuel level reading on a scan tool and compare it with the actual amount.
- Check the ground at the sensor connector.
- Measure the sensor resistance; an infinite reading means an internal open.
- Check continuity of the signal wire to the computer or instrument cluster.
- Inspect the connector on top of the tank for corrosion or looseness.
How to fix5
- Clean or replace the connector.
- Repair the ground wire or weak ground point.
- Repair the open signal wire.
- Replace the sensor, or the pump module it is built into, if the resistor track is damaged.
- Clear the codes and confirm the fuel gauge reads correctly.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
In the Saudi market: SAR 100–1,500 (≈ USD 27–400)
Our prices come from the Saudi market, converted at a fixed rate (SAR 3.75 per USD). Prices in your country may differ a lot, so we show the cost level.
The cost is low for a ground or connector fault, and rises when a new sensor or complete pump module is needed and the tank must be lowered.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
What is the difference between P0462 and P0463?
P0462 means the signal is too low, usually from a short to ground. P0463 means it is too high, usually from an open in the circuit or ground.
Why did the code appear after filling the tank?
On some vehicles the top part of the resistor track is worn or rarely used, so it loses contact when the tank is full, which points to a failing sensor.
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