P0462 Code: Fuel Level Sensor Circuit Low Input

What the P0462 code means

The fuel level sender reports how much fuel is in the tank. Besides the gauge needle on the dash, the computer uses it to decide when to run the EVAP test (normally with the tank between 15 and 85 percent full) and to detect misfires caused by running out of fuel.

The sender is a variable resistor moved by a float, and the computer (or the instrument cluster) measures its resistance or the resulting voltage. The P0462 code is a low signal, which is usually caused by the signal wire shorted to ground or by a missing reference.

With the level signal failing, the needle may stay fixed or move at random, and the EVAP test does not run. Wear on the resistive track of the sender is very common as the years go by, and the needle jumps at certain levels. Look up the sensor guide to see how it is tested.

To confirm it, unplug the component with the key on and watch what happens to the reading or the code. If the value jumps to the opposite extreme, the wiring is fine and the component is the one pulling the signal to ground. If it does not change, look for the short in the wire, starting where the harness rubs against the engine, the chassis or the exhaust.

P0462 code symptoms

• Check engine light on.
• Incorrect fuel gauge reading and an incomplete EVAP test.
• Emissions monitor incomplete, so the vehicle cannot pass inspection.
• Often there are no other driving symptoms.

Likely causes of the P0462 code

1. Signal wire shorted to ground from rubbing or heat.
2. 5 V reference shorted, if other sensors are also failing.
3. Damaged sender with an internal short.
4. Connector with water. Very common on sensors mounted under the vehicle.

How to diagnose the P0462 code step by step

1. Read the sensor value on the scan tool and compare it with what you expect.
2. Inspect the connector for corrosion, water or loose pins.
3. Check the reference and ground and measure the sender resistance with the connector unplugged.
4. Measure the signal with the connector plugged in and see whether it changes with conditions.
5. Do a wiggle test on the wiring.
6. Check continuity to the computer.
7. Add a known amount of fuel and check whether the needle moves in proportion.
8. Measure the sender resistance at several levels at the fuel pump connector.

How to fix the P0462 code

• Repair the connector or the wiring.
• Replace the sender if the tests confirm it is bad.
• Correct the real condition if there is one (a leak or a blockage).
• Clear the codes and complete a drive cycle so the monitor runs.

Technical reference data

• Variable resistance (for example 10 ohms full and 180 ohms empty, or the other way around, depending on the manufacturer).
• Approximate values only: check the manufacturer data for your engine.

Brand-specific notes

On many vehicles the fuel level sender is sold together with the fuel pump module, and on others it is sold separately. Check which applies to yours before you price the repair.

When the signal is low, unplugging the sender with the key on is the quickest way to tell a bad sender from a shorted wire.

Frequently asked questions about P0462