The fuel level sensor is a float on a resistor track in the tank unit. It is no emission part, but other monitors depend on it – the EVAP leak tests, for example, need at least 15 % fuel – so CARB requires it to be monitored and the usual exemption from the warning lamp does not apply. Low and high refer to the signal, not the fuel level: on GM a full tank is about 40 Ω and a low voltage, while Ford judges the resistance directly. P0462 means the signal is below its lower limit: GM below 10 % of the 5 V reference (100 of 125 samples, MIL after two trips), Saab 9-4X below 0.25 V for 5 s, Ford a resistance below 5 Ω for 30 s. Typical is a signal wire shorted to ground or a shorted sensor. The gauge sticks at one end and a substitute value is used.
Low severity. Can I keep driving?You can normally keep driving. If it affects the fuel level, do not trust the gauge and refuel earlier than usual.
Symptoms
- Fuel gauge wrong, stuck or jumping
- Range display and low-fuel warning wrong
- Check engine light (depending on the maker)
Most likely causes
- Signal wire shorted to ground (chafed at tank or underbody)
- Sensor shorted or damaged internally
- Water or corrosion in the tank connector
- Evaluating module faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P0462 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 4: Emissions
- 62: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0462?
You can normally keep driving. If it affects the fuel level, do not trust the gauge and refuel earlier than usual.
What causes code P0462?
The most common causes are: signal wire shorted to ground (chafed at tank or underbody); sensor shorted or damaged internally; water or corrosion in the tank connector.
Related codes
- P0460Fuel Level Sensor A Circuit
- P0461Fuel Level Sensor A Circuit Range/Performance
- P0463Fuel Level Sensor A Circuit High
- P0464Fuel Level Sensor A Circuit Intermittent
- P2067Fuel Level Sensor B Circuit Low
Sources
- gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
- gsi.ext.gm.com: 14OBDG10 Engine Diagnostics
- fordservicecontent.com: OBD Operations Summary Gasoline 2020 2023
- saabwisonline.com: p0462 00
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.