Fuel Level Sensor Circuit Low Input
The P0462 code indicates that the Powertrain Control Module (PCM) has detected a low voltage signal from the fuel level sensor circuit. This typically means the sensor's resistance is too low (below the expected range) or there is a short to ground in the wiring. The fuel level sensor is a variable resistor that changes resistance based on fuel level; a low input suggests the sensor is reading empty or the circuit is grounded. Common causes include a faulty fuel level sensor, damaged wiring, or a poor electrical connection.
01. Most Common Causes
- Faulty fuel level sensor
- Short to ground in the fuel level sensor circuit
- Damaged wiring or connector at the fuel tank
- Corroded or loose electrical connections
02. Symptoms You Will Notice
- Inaccurate or erratic fuel gauge reading
- Fuel gauge stuck on empty
- Check Engine Light illuminated
- Possible no-start condition if fuel level is actually low
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check freeze frame data.
Step 2: Inspect the fuel level sensor wiring and connector for damage, corrosion, or loose pins.
Step 3: Measure the sensor resistance at the connector; compare to manufacturer specs (typically 10-100 ohms empty, 100-1000 ohms full).
Step 4: If resistance is out of range, replace the fuel level sensor (often part of the fuel pump module).
Step 5: Clear the code and test drive to confirm repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but you risk running out of fuel if the gauge is inaccurate. Have it diagnosed soon.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, but can be higher if the fuel pump module needs replacement.