P0461 — Fuel level sensor rationality

Causes

• Faulty fuel level sender (float/potentiometer) or fuel pump module assembly
• Open, shorted or corroded wiring/connectors between sender and control module
• Poor or missing ground at sender or control module
• Float stuck, saturated, or mechanically obstructed (contaminants, debris, foam)
• Intermittent connector contact or water ingress in tank
• Corrupted or incorrect module calibration/software fault in instrument cluster/BCM/ECU

Symptoms

• MIL/Check Engine light illuminated
• Fuel gauge reads incorrectly (stuck, jumps, reads empty/full incorrectly)
• Fuel level displayed by scan tool differs from instrument cluster or actual fuel amount
• Erratic or intermittent fuel level changes during driving
• Inability to refuel reading to update (gauge does not change after filling)

What to check

• Retrieve freeze frame and live data with a diagnostic scanner; note fuel level percentage and related parameters.
• Confirm DTC is current and attempt to reproduce by cycling ignition and driving to see if code returns.
• Visually inspect wiring and connectors at fuel pump module and underbody for corrosion, damage, or chafing.
• Backprobe sender connector with key ON and monitor signal voltage and reference/ground.
• Measure sender resistance across terminals while moving the float (if accessible) and compare to expected change.
• Wiggle harness and connectors while watching live data for intermittent changes.

Signal parameters

• Sender reference voltage: typically an ignition-switched 5 V reference (verify exact value in factory manual).
• Typical sender signal: variable 0.1–4.9 V (model-dependent); empty and full voltages vary by vehicle — consult service data.
• Sender resistance: varies by model (many systems use low-ohm ranges, others use 0–250 Ω). Expect resistance to change smoothly as float moves.
• Continuity: good continuity between sender connector and control module; no short to battery or ground.

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