AutoCodes – GMC – P2068 2016 GMC Sierra

P2068 2016 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 2016 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.

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Code Popularity 204

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 29, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2068 2016 GMC Sierra Description

Diesel Engine
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.

OBDII Code P2068 2016 GMC Sierra - Fuel Level Sensor 2 Circuit High Voltage - AutoCodes.com — P2068 2016 GMC Sierra Code - Fuel Level Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2068 2016 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 2016 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.

What does this mean?

Code Tech Notes

A low fuel level can trigger this code. Before replacing any parts, try filling up the fuel tank and erasing the engine code. If the problem persists, it may be necessary to replace the fuel level sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2068 2016 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.

Need more information about the P2068 2016 GMC Sierra code?

Need more information on how to fix the P2068 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2068 2016 GMC Sierra Code

1. What does OBDII code P2068 mean for my 2016 GMC Sierra?

- OBDII code P2068 on a 2016 GMC Sierra indicates an issue with the Fuel Level Sensor 2 Circuit registering high voltage.

2. What are the common symptoms of OBDII code P2068 on a 2016 GMC Sierra?

- Common symptoms of code P2068 include inaccurate fuel level readings on the gauge, fluctuating fuel level readings, and possibly an illuminated check engine light.

3. What are the potential causes of OBDII code P2068 on a 2016 GMC Sierra?

- The code P2068 on a 2016 GMC Sierra can be triggered by issues such as a faulty fuel level sensor, damaged wiring or connectors in the sensor circuit, or a problem with the vehicle's powertrain control module (PCM).

4. How do I diagnose the Fuel Level Sensor 2 Circuit high voltage issue on my 2016 GMC Sierra?

- Diagnosing the P2068 code typically involves inspecting the fuel level sensor and its wiring for any visible damage, checking the sensor's resistance values, and testing the sensor's voltage output.

5. Can I still drive my 2016 GMC Sierra with OBDII code P2068?

- While it may be possible to drive your GMC Sierra with the P2068 code, it's recommended to address the issue promptly to prevent inaccurate fuel level readings and potential further damage to the sensor or related components.

6. How can I repair OBDII code P2068 on my 2016 GMC Sierra?

- Repairing code P2068 often involves replacing the faulty fuel level sensor, repairing any damaged wiring or connectors, and clearing the code with a diagnostic scan tool.

7. Is it necessary to reset the OBDII code P2068 after repairing the issue on my 2016 GMC Sierra?

- Yes, it's important to clear the P2068 code using a diagnostic scan tool after repairing the Fuel Level Sensor 2 Circuit high voltage problem on your 2016 GMC Sierra.

8. Can a DIY enthusiast fix OBDII code P2068 on a 2016 GMC Sierra?

- While some aspects of diagnosing and repairing the P2068 code may be within reach of a DIY enthusiast, it's recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is fully resolved.

9. How long does it usually take to repair OBDII code P2068 on a 2016 GMC Sierra?

- The time required to repair the P2068 code on a 2016 GMC Sierra can vary depending on the exact cause of the issue, but it typically ranges from 1 to 3 hours in a professional repair setting.

10. What happens if I ignore OBDII code P2068 on my 2016 GMC Sierra?

- Ignoring the P2068 code on your 2016 GMC Sierra can lead to inaccurate fuel level readings, potential fuel-related issues, and may cause further damage to the fuel level sensor or related components over time.