P2068 2018 GMC Sierra Code - Fuel Level Sensor 2 Circuit High Voltage
Quick Answer
Diesel Engine The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2068 2018 GMC Sierra indicates Fuel Level Sensor 2 Circuit High Voltage.
- Common causes
- Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P2068 2018 GMC Sierra Description
The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The Fuel Pump Driver Control Module monitors the signal circuits of the primary fuel level sensor and the secondary fuel level sensor and sends the signal information to the Engine Control Module (ECM) for all further handling. The ECM uses this value in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level sensors are low, and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high, and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel gauge.
Gasoline Engine
The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The Engine Control Module (ECM) monitors the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level sensors are low, and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high, and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel gauge.
The Diagnostic Trouble Code (DTC) will be set if the ECM detects the signal voltage is greater than 4.7 V.
What are the Possible Causes of the DTC P2068 2018 GMC Sierra?
- Faulty Fuel Level Sensor
- Fuel Level Sensor harness is open or shorted
- Fuel Level Sensor circuit poor electrical connection
- Faulty Instrument Cluster
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2068 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2068 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P2068 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P2068 in a 2018 GMC Sierra related to the Fuel Level Sensor 2 Circuit High Voltage?
- Common symptoms include inaccurate fuel level readings on the dashboard, fluctuating fuel gauge readings, and the check engine light being illuminated.
2. What are the possible causes of OBDII code P2068 in a 2018 GMC Sierra?
- The code P2068 can be triggered by issues such as a faulty fuel level sensor, damaged wiring or connectors in the fuel level sensor circuit, or a malfunctioning instrument cluster.
3. How can I diagnose the Fuel Level Sensor 2 Circuit High Voltage issue in my 2018 GMC Sierra?
- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code (P2068), conducting a visual inspection of the fuel level sensor and its wiring, and performing electrical tests to check for voltage irregularities.
4. Is it safe to continue driving my 2018 GMC Sierra with OBDII code P2068 related to the Fuel Level Sensor 2 Circuit High Voltage?
- It is generally not advisable to drive the vehicle with this issue as inaccurate fuel level readings can lead to running out of fuel unexpectedly. It is recommended to address the problem promptly.
5. Can I repair the Fuel Level Sensor 2 Circuit High Voltage problem in my 2018 GMC Sierra myself?
- Depending on your level of automotive expertise, you may be able to address the issue yourself by replacing the faulty fuel level sensor or repairing damaged wiring. However, professional diagnosis and repair are recommended for complex electrical issues.
6. How much does it typically cost to repair OBDII code P2068 in a 2018 GMC Sierra?
- The cost of repairing the Fuel Level Sensor 2 Circuit High Voltage issue can vary depending on the root cause of the problem, the extent of the repairs needed, and whether you choose to do the work yourself or take the vehicle to a professional mechanic.
7. Are there any preventive maintenance tips to avoid encountering OBDII code P2068 in a 2018 GMC Sierra?
- Regularly checking and maintaining the fuel system components, including the fuel level sensor, can help prevent issues that may trigger code P2068. Additionally, prompt repair of any dashboard warning lights can prevent further damage.
8. Can a faulty fuel level sensor cause other problems in a 2018 GMC Sierra besides triggering OBDII code P2068?
- Yes, a faulty fuel level sensor can cause issues such as inaccurate fuel level readings, incorrect fuel gauge readings, and potential fuel system malfunctions that may affect the vehicle's performance and efficiency.
9. Will resetting the OBDII system clear the P2068 code related to the Fuel Level Sensor 2 Circuit High Voltage in a 2018 GMC Sierra?
- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is recommended to diagnose and repair the root cause of the problem.
10. How urgent is it to address OBDII code P2068 in a 2018 GMC Sierra linked to the Fuel Level Sensor 2 Circuit High Voltage?
- While the vehicle may still be operable with this issue, it is important to address it promptly to avoid potential fuel-related problems and ensure accurate fuel level monitoring. Ignoring the problem could lead to inconvenience and potential damage.
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