AutoCodes – GMC – P0231 2018 GMC Sierra

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

Quick Answer

The Engine Control Module (ECM) supplies voltage to the fuel pump driver control module when the ECM detects that the ignition is on. Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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: P0231 2018 GMC Sierra indicates Fuel Pump Control Circuit Low Voltage.
Common causes: Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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 239

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 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0231 2018 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to the fuel pump driver control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump driver control module remains active for 2 s, unless the engine is in crank or run. While this voltage is being received, the fuel pump driver control module supplies a varying voltage to the fuel tank fuel pump module in order to maintain the desired fuel line pressure. The fuel pump driver control module monitors the fuel pump voltage to determine if the fuel pump is functioning as commanded. The Diagnostic Trouble Code (DTC) will be set if the fuel pump driver control module detects that the fuel pump current is greater than 14.48 A for 1 s.

OBDII Code P0231 2018 GMC Sierra - Fuel Pump Control Circuit Low Voltage - AutoCodes.com — P0231 2018 GMC Sierra Code - Fuel Pump Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0231 2018 GMC Sierra?

Faulty Fuel Pump
Fuel Pump harness is open or shorted
Fuel Pump circuit poor electrical connection
Faulty Fuel Pump Driver Control Module

How to Fix the DTC P0231 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0231 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.

Need more information about the P0231 2018 GMC Sierra code?

Need more information on how to fix the P0231 2018 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 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.