P0460 on GMC: How to Diagnose & Fix
Fuel Level Sensor Circuit Malfunction
1 GMC model · 1 documented issue · $250-$900 repair
P0460 on GMC by model: symptoms, diagnosis and fix
On 2007–2014 Sierra 3500HD models, the fuel tank mounting straps and the fuel level sender unit are prone to corrosion, causing inaccurate fuel gauge readings and in some cases complete sender failure. NHTSA complaint data documents numerous owners reporting sudden fuel gauge drops to empty or erratic readings unrelated to actual fuel level. The plastic float arm on the sender can also crack, exacerbating the problem.
Common Symptoms
- Erratic or inaccurate fuel gauge readings
- Fuel gauge stuck on full or empty regardless of tank level
- Low fuel warning activating with significant fuel remaining
- Running out of fuel despite gauge showing fuel remaining
- DIC fuel range displaying incorrect distance to empty
How to Fix
Replace fuel level sender/pump module assembly (ACDelco M100087 or equivalent). Inspect and replace corroded fuel tank straps if necessary (GM part 15811919). Tank may require drop for full access. Application of anti-corrosion spray on new straps is recommended. Labor 2–3 hours; flush tank if sediment contamination is present.
Sources for this issue (3)
P0460 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0460 mean on a GMC?
P0460 stands for "Fuel Level Sensor Circuit Malfunction." This code means the powertrain computer sees a problem in the fuel level sensor circuit, the sender unit inside your fuel tank that tells the gauge and computer how much fuel is present. The reading may be erratic, stuck, or not changing as fuel is used, which the computer flags as a malfunction. While it mainly causes an inaccurate or erratic fuel gauge, the computer also uses fuel level for some emissions (EVAP) tests, so it can affect monitor readiness. It generally points to the sending unit or its wiring rather than the engine itself. On GMC it is documented across 1 model: Sierra 3500HD.
What are the most common causes of P0460?
The most common causes of P0460 are: Faulty fuel level sending unit (float/sensor) in the tank, Corroded or worn sensor resistor card, Damaged or shorted wiring to the fuel level sensor, Loose or corroded connector at the tank or harness, Stuck or broken float arm, Poor ground in the fuel sender circuit, Faulty instrument cluster or PCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P0460 on a GMC?
Published repair estimates on GMC range from $250 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.