P2A64: Alternative Fuel Tank C Level Sensor Circuit

What it means

The alternative fuel tank C level sensor circuit has a fault, so the control module may not be able to read the tank level correctly.

At a glance

• Usually lights the check-engine light

How it works

Tank C’s level sensor reports how much alternative fuel remains to the alternative-fuel control module. This circuit code sets when the module detects a fault in the sensor circuit and cannot rely on that reading.

Common causes

Most likely first.

1. Level sensor failed
2. Wiring or connector fault

Symptoms

• Check-engine or alternative-fuel system warning light
• Alternative-fuel tank level or remaining range may be inaccurate
• Alternative-fuel operation may be limited

How to diagnose it

1. Record freeze-frame data and compare the alternative-fuel level reading with the displayed gauge to see when the fault occurred.
2. Inspect tank C’s level-sensor connector and wiring for loose plugs, corrosion, damage, or poor repairs.
3. With the vehicle secured and the relevant service information available, check the sensor circuit connections and ground for continuity or unwanted resistance.
4. Compare the sensor output and its circuit response with the manufacturer's specification to distinguish a sensor fault from a wiring fault.
5. Repair the confirmed circuit or sensor fault, then clear the code and verify that the tank C reading is stable.

Common fixes

• Reconnect and secure a loose tank C level-sensor connector.
• Clean or repair corroded connector terminals and damaged wiring.
• Repair a poor sensor ground or circuit connection.
• Replace the tank C level sensor if its output fails the manufacturer's checks.

Can I keep driving?

The code can make the alternative-fuel level and remaining range unreliable, and the system may limit alternative-fuel operation. Do not rely on the gauge to judge how much fuel remains; switch fuels or stop safely if the vehicle's alternative-fuel operation becomes unreliable.