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Engine-Codes – GMC – P0231 2018 GMC Sierra

P0231 2018 GMC Sierra Code - Fuel Pump Control Circuit Low Voltage

Quick Answer

The P0231 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a Fuel Pump Control Circuit Low Voltage. Common causes include Faulty fuel pump, Damaged wiring or connectors in the fuel pump control circuit, Malfunctioning fuel pump relay. 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
P0231 2018 GMC Sierra indicates Fuel Pump Control Circuit Low Voltage.
Common causes
Common causes include Faulty fuel pump, Damaged wiring or connectors in the fuel pump control circuit, Malfunctioning fuel pump relay.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0231 2018 GMC Sierra Description

The P0231 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a Fuel Pump Control Circuit Low Voltage. This code is triggered when the powertrain control module (PCM) detects that the voltage in the fuel pump control circuit is lower than the specified range. The fuel pump control circuit is responsible for regulating the fuel pump's operation, ensuring that the correct amount of fuel is delivered to the engine for optimal performance.

OBDII Code P0231 2018 GMC Sierra - Fuel Pump Control Circuit Low Voltage
P0231 2018 GMC Sierra Code - Fuel Pump Control Circuit Low Voltage

Common Causes of P0231 2018 GMC Sierra

  1. Faulty fuel pump.
  2. Damaged wiring or connectors in the fuel pump control circuit.
  3. Malfunctioning fuel pump relay.
  4. Issues with the powertrain control module (PCM).
  5. Electrical issues such as a blown fuse or corroded connections.

Symptoms of P0231 2018 GMC Sierra

  1. Engine misfires or hesitation during acceleration.
  2. Reduced fuel efficiency.
  3. Engine stalling or difficulty starting.
  4. Illumination of the check engine light.
  5. Rough idling or engine performance issues.

How to Fix P0231 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the fuel pump, wiring, and connectors to identify any visible damage or issues.
  2. Test the fuel pump relay and replace it if necessary.
  3. Use a multimeter to check the voltage in the fuel pump control circuit and ensure it is within the specified range.
  4. If the voltage is low, check for any electrical issues such as blown fuses or corroded connections and repair as needed.
  5. If the issue persists, consider replacing the fuel pump or consulting a professional mechanic for further diagnosis and repair.

Cost to Fix P0231 2018 GMC Sierra

The typical repair costs for addressing a P0231 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a fuel pump relay or repairing wiring/connectors may cost between $100 to $300. However, if the fuel pump itself needs to be replaced, the cost can range from $300 to $800 or more, including parts and labor. It is essential to consider the specific diagnosis time and labor rates at auto repair shops, which can vary based on location, vehicle make and model, and engine type. It's advisable to consult with a professional mechanic to get an accurate estimate for the repair.

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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 P0231 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0231 in a 2018 GMC Sierra?

The common symptoms of code P0231 include engine stalling, poor acceleration, difficulty starting the vehicle, and illuminated Check Engine Light.

2. What does the OBDII code P0231 indicate in a 2018 GMC Sierra?

Code P0231 indicates a low voltage condition in the fuel pump control circuit of the vehicle.

3. What are the possible causes of OBDII code P0231 in a 2018 GMC Sierra?

Possible causes of code P0231 include a faulty fuel pump, damaged wiring or connectors in the fuel pump circuit, a defective fuel pump relay, or issues with the vehicle's PCM.

4. How can I diagnose the OBDII code P0231 in my 2018 GMC Sierra?

Diagnosing code P0231 involves checking the fuel pump fuse, inspecting the fuel pump relay, testing the fuel pump voltage, and examining the wiring and connectors for any visible damage.

5. What steps can I take to repair OBDII code P0231 in a 2018 GMC Sierra?

To repair code P0231, you may need to replace the fuel pump, repair or replace damaged wiring and connectors, replace the fuel pump relay, or reprogram the vehicle's PCM if necessary.

6. Can driving with OBDII code P0231 in a 2018 GMC Sierra cause further damage?

Continuing to drive with code P0231 can potentially cause damage to the fuel system components and may lead to more severe issues, such as engine misfires or complete fuel system failure.

7. How urgent is it to address OBDII code P0231 in a 2018 GMC Sierra?

It is important to address code P0231 promptly to avoid potential safety hazards, poor vehicle performance, and further damage to the fuel system components.

8. Is it possible to reset the Check Engine Light after repairing OBDII code P0231 in a 2018 GMC Sierra?

Once the underlying issue causing code P0231 is repaired, the Check Engine Light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

9. Can a DIY enthusiast repair OBDII code P0231 in a 2018 GMC Sierra, or should it be done by a professional mechanic?

While some DIY enthusiasts may be able to diagnose and repair code P0231, it is recommended to seek assistance from a professional mechanic, especially if dealing with fuel system components.

10. How can I prevent OBDII code P0231 from recurring in my 2018 GMC Sierra?

To prevent code P0231 from recurring, it is essential to perform regular maintenance on the fuel system, including checking fuel pump operation, inspecting wiring for damage, and addressing any issues promptly.

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