P0463 GMC Code - Fuel Level Sensor 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
- P0463 GMC indicates Fuel Level Sensor 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 P0463 GMC 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 P0463 GMC?
- 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 P0463 GMC?
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 P0463 GMC 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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Information for Specific GMC Models
- P0463 2014 GMC Sierra — Fuel Level Sensor Circuit High Voltage
- P0463 2015 GMC Sierra — Fuel Level Sensor Circuit High Voltage
- P0463 2016 GMC Sierra — Fuel Level Sensor Circuit High Voltage
- P0463 2017 GMC Sierra — Fuel Level Sensor Circuit High Voltage
- P0463 2018 GMC Sierra — Fuel Level Sensor Circuit High Voltage
Frequently Asked Questions about P0463 GMC Code
1. What are the common symptoms of OBDII code P0463 in a GMC vehicle?
The common symptoms of OBDII code P0463 in a GMC vehicle include inaccurate fuel gauge readings, fluctuating fuel gauge readings, and the fuel gauge showing full even when the tank is not full.
2. What can cause the OBDII code P0463 to trigger in a GMC vehicle?
The OBDII code P0463 in a GMC vehicle is triggered when the fuel level sensor circuit reports a high voltage signal to the engine control module (ECM), indicating a potential issue with the fuel level sensor or its wiring.
3. How serious is the OBDII code P0463 in a GMC vehicle?
While the OBDII code P0463 itself may not cause immediate drivability issues, it can lead to inaccurate fuel level readings, which may result in running out of fuel unexpectedly. It is important to address this code to ensure proper fuel level monitoring.
4. Can the fuel level sensor circuit high voltage issue be caused by a faulty fuel pump in a GMC vehicle?
Yes, a faulty fuel pump can potentially cause the fuel level sensor circuit high voltage issue (P0463) in a GMC vehicle. It is important to diagnose the root cause properly to determine if the fuel pump or the fuel level sensor is the culprit.
5. What are some DIY repair tips for addressing the OBDII code P0463 in a GMC vehicle?
Some DIY repair tips for addressing the OBDII code P0463 in a GMC vehicle include checking the fuel level sensor wiring for any damage or corrosion, inspecting the fuel level sensor for proper operation, and ensuring the fuel pump is functioning correctly.
6. Is it safe to continue driving a GMC vehicle with the OBDII code P0463 active?
While driving with the OBDII code P0463 active may not pose an immediate safety risk, it is not recommended as it can lead to inaccurate fuel level readings. It is best to address the issue promptly to avoid running out of fuel unexpectedly.
7. How can a professional mechanic diagnose the OBDII code P0463 in a GMC vehicle?
A professional mechanic can diagnose the OBDII code P0463 in a GMC vehicle by using a scan tool to read the code and checking the fuel level sensor circuit for proper voltage readings. They may also perform a visual inspection of the sensor and its wiring.
8. What is the typical cost to repair the OBDII code P0463 in a GMC vehicle?
The cost to repair the OBDII code P0463 in a GMC vehicle can vary depending on the root cause of the issue. Repairs may involve replacing the fuel level sensor, repairing damaged wiring, or addressing issues with the fuel pump. Costs can range from $100 to $500 or more.
9. Can resetting the OBDII code P0463 in a GMC vehicle temporarily solve the issue?
Resetting the OBDII code P0463 in a GMC vehicle may temporarily clear the code, but if the underlying issue with the fuel level sensor circuit high voltage is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.
10. How long does it typically take to repair the OBDII code P0463 in a GMC vehicle?
The time it takes to repair the OBDII code P0463 in a GMC vehicle can vary depending on the extent of the issue and the specific repairs needed. In general, a repair for this code can take anywhere from 1 to 3 hours, but it may take longer if additional diagnostics or parts replacement are required.
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