Fuel Level Sensor Circuit Low
The P0462 code means the vehicle's onboard diagnostic system has detected: Fuel Level Sensor Circuit Low. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Fuel gauge stuck on full
- Low fuel warning never activates
- Trip computer shows incorrect range
Probable Causes (Ranked by Likelihood)
- Short to ground in fuel level sensor wiring Very High
- Failed fuel level sensor (shorted internally) High
- Corroded connector at fuel pump module Moderate
- Instrument cluster input fault Low
Step-by-Step Diagnostic Procedure
-
Read fuel level PID on scan tool. If it shows full regardless of actual fuel level, circuit is shorted low.
-
Disconnect fuel pump connector and measure sensor resistance. Near 0 ohms indicates short.
-
Check wiring from fuel pump connector to PCM for short to ground.
-
With connector disconnected, verify scan tool reads empty (open circuit default).
Common Fixes by Vehicle
What techs usually find when diagnosing P0462 on specific vehicles — tap your vehicle for the fix and the exact part:
2004-2016 Ford F-150 5.4L/5.0L Moderate DIY
Low fuel level sensor input means the sender is reading near-zero resistance. On F-150s this is typically a worn-out resistor card on the fuel sender float arm. The sender is integrated into the fuel pump module. Replace the module or just the sender unit if available separately.
Labor: 2-3 hours2006-2016 Chevrolet Impala/Malibu 3.5L/3.6L Moderate DIY
The fuel level sensor signal wire shorts to ground in the body harness. Check the connector at the fuel pump module first for corrosion. Sulfur in fuel can corrode the sender contacts and cause low readings. Replace the fuel level sender with ACDelco SK1402 and use a fuel system cleaner.
Labor: 2-3 hours2008-2018 GMC Acadia/Buick Enclave 3.6L Moderate DIY
The fuel level sender in the GM Lambda platform SUVs is known for premature failure due to ethanol content in fuel degrading the resistor card. GM extended coverage under a special policy on some model years. Check with the dealer for warranty coverage before paying for repair.
Labor: 2-3 hoursFrequently Asked Questions
Why is my fuel gauge stuck on full?
A short in the fuel level sensor circuit sends a low resistance signal to the PCM, which it interprets as a full tank.
Can a corroded connector cause P0462?
Yes, corrosion between pins can create a low-resistance path that mimics a full-tank reading.
Is it dangerous to have the gauge stuck on full?
It can be. Without knowing your actual fuel level, you risk running out of fuel unexpectedly.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0462 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
See All Codes & Fixes for Your Vehicle
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