AutoCodes – GMC – P0231 2015 GMC Sierra

P0231 2015 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 2015 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 226

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 2015 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 2015 GMC Sierra - Fuel Pump Control Circuit Low Voltage - AutoCodes.com — P0231 2015 GMC Sierra Code - Fuel Pump Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0231 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the P0231 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 2015 GMC Sierra Code

1. What does the OBDII code P0231 mean on a 2015 GMC Sierra?

P0231 indicates a low voltage condition in the fuel pump control circuit, meaning the power supply to the fuel pump is insufficient for proper operation.

2. What are the symptoms of a P0231 code on a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine, engine stalling, reduced power, or a no-start condition.

3. What causes the P0231 code on a 2015 GMC Sierra?

Common causes include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or issues with the Powertrain Control Module (PCM).

4. Can a bad fuel pump trigger the P0231 code?

Yes, a failing fuel pump can cause low voltage in the circuit and trigger the P0231 code.

5. How can I diagnose the P0231 code on my GMC Sierra?

Inspect the fuel pump relay, wiring, and connectors for damage or corrosion. Test the fuel pump and check for proper voltage using a multimeter.

6. Can a blown fuse cause the P0231 code?

Yes, a blown fuel pump fuse can disrupt the circuit and result in the P0231 code.

7. Is the P0231 code serious on a 2015 GMC Sierra?

Yes, it can lead to engine performance issues or a no-start condition, so it should be addressed promptly.

8. How do I fix the P0231 code on my GMC Sierra?

Repairs may include replacing the fuel pump relay, repairing or replacing damaged wiring, inspecting and replacing the fuel pump, or reprogramming the PCM if necessary.

9. Can a weak battery cause the P0231 code?

A weak or failing battery could potentially cause low voltage in the fuel pump circuit, but it is less common. Always verify battery health during diagnostics.

10. Do I need to replace the PCM if I get the P0231 code?

Replacing the PCM is rarely necessary for this code. Only consider it after all other components in the fuel pump circuit have been tested and verified to be in good condition.