Fuel Level Sensor Circuit High
The P2068 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the fuel level sensor that is higher than the expected range. This typically means the sensor's resistance is too low or there is a short to voltage in the circuit. The fuel level sensor is a variable resistor that changes resistance based on fuel level; a high voltage reading suggests the sensor is reporting a full tank or a fault. Common causes include a faulty sensor, wiring issues (short to power), or a problem with the ECM.
1. Most Common Causes
- Faulty fuel level sensor
- Short to voltage in the sensor circuit
- Corroded or damaged wiring/connectors
- Failed ECM (rare)
2. Symptoms You Will Notice
- Inaccurate fuel gauge reading (always shows full or erratic)
- Check Engine Light illuminated
- Possible hard starting or stalling if sensor affects fuel pump operation
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check fuel level sensor voltage.
Step 2: Visually inspect the sensor wiring and connector for damage, corrosion, or shorts.
Step 3: Test the sensor resistance with a multimeter; compare to manufacturer specs.
Step 4: Check for a short to voltage by disconnecting the sensor and measuring voltage at the harness.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but inaccurate fuel readings can lead to running out of gas. If the sensor affects the fuel pump, it may cause stalling.
How much does it cost to fix?▼
Repair costs range from $50 to $150 for DIY sensor replacement, or $100 to $300 at a shop including labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.