P0464 GMC Code - Fuel Level Sensor Circuit Intermittent
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
- P0464 GMC indicates Fuel Level Sensor Circuit Intermittent.
- 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 P0464 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 fuel level change is greater than 10% for a duration lasting less than 30 seconds.
What are the Possible Causes of the DTC P0464 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 P0464 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 P0464 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.
Need more information about the P0464 GMC code?
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Information for Specific GMC Models
- P0464 2014 GMC Sierra — Fuel Level Sensor Circuit Intermittent
- P0464 2015 GMC Sierra — Fuel Level Sensor Circuit Intermittent
- P0464 2016 GMC Sierra — Fuel Level Sensor Circuit Intermittent
- P0464 2017 GMC Sierra — Fuel Level Sensor Circuit Intermittent
- P0464 2018 GMC Sierra — Fuel Level Sensor Circuit Intermittent
Frequently Asked Questions about P0464 GMC Code
1. What does the OBDII code P0464 mean on a GMC vehicle?
P0464 indicates an intermittent issue with the fuel level sensor circuit, which means the sensor is not consistently providing accurate readings to the vehicle's computer.
2. What are the common symptoms of code P0464 in a GMC?
Symptoms include an erratic or inaccurate fuel gauge, the check engine light turning on, and potentially poor fuel economy due to incorrect fuel level readings.
3. What causes the P0464 code to appear in a GMC?
Common causes include a faulty fuel level sensor, loose or damaged wiring, corroded electrical connections, or a malfunctioning instrument cluster.
4. Can a bad fuel pump cause the P0464 code in my GMC?
While the fuel pump itself typically doesn’t trigger P0464, the fuel level sensor, which is often part of the fuel pump assembly, may fail and cause the code.
5. How is the P0464 code diagnosed on a GMC?
A mechanic will use a scan tool to retrieve the code, inspect the wiring and connectors for damage, and test the fuel level sensor for proper operation.
6. Can I drive my GMC with a P0464 code?
While the vehicle may still run, driving with this code can lead to inaccurate fuel level readings, increasing the risk of running out of fuel unexpectedly.
7. How do you fix the P0464 code on a GMC vehicle?
Repairs may involve replacing the fuel level sensor, fixing damaged wiring or connectors, or reprogramming the vehicle’s computer if necessary.
8. How much does it cost to fix the P0464 code on a GMC?
The repair cost can vary but typically ranges from $150 to $400, depending on whether the fuel level sensor or other components need replacement.
9. Can a software update fix the P0464 code on a GMC?
In some cases, a software update to the vehicle’s computer may resolve the issue if it’s caused by a programming error.
10. How can I prevent the P0464 code from recurring on my GMC?
Regularly inspect the fuel system wiring and connectors for damage, and ensure the fuel tank and sensor are not exposed to excessive moisture or contaminants.
Discuss the causes and fixes for P0464 GMC OBDII Code
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