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Engine-Codes – GMC – P0231 2016 GMC Sierra

P0231 2016 GMC Sierra Code - Fuel Pump Control Circuit Low Voltage

Quick Answer

The P0231 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a Fuel Pump Control Circuit Low Voltage. Common causes include Faulty wiring or connectors in the fuel pump control circuit, Malfunctioning fuel pump relay, Defective fuel pump. 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 2016 GMC Sierra indicates Fuel Pump Control Circuit Low Voltage.
Common causes
Common causes include Faulty wiring or connectors in the fuel pump control circuit, Malfunctioning fuel pump relay, Defective fuel pump.
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 2016 GMC Sierra Description

The P0231 diagnostic trouble code (DTC) for a 2016 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 expected. 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 combustion. When the voltage in this circuit is too low, it can lead to issues with fuel delivery, potentially causing drivability problems and affecting the vehicle's overall performance.

OBDII Code P0231 2016 GMC Sierra - Fuel Pump Control Circuit Low Voltage
P0231 2016 GMC Sierra Code - Fuel Pump Control Circuit Low Voltage

Common Causes of P0231 2016 GMC Sierra

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

Symptoms of P0231 2016 GMC Sierra

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

How to Fix P0231 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the fuel pump control circuit, checking for any damaged wiring or connectors. Repair or replace any faulty components as needed.
  2. Test the fuel pump relay to ensure it is functioning correctly. Replace the relay if it is found to be faulty.
  3. Check the fuel pump itself for any signs of damage or malfunction. If necessary, replace the fuel pump with a new unit.
  4. Verify the operation of the powertrain control module (PCM) and address any issues with its functionality. Replacing the PCM may be necessary in some cases.
  5. Clear the diagnostic trouble codes from the PCM's memory and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0231 2016 GMC Sierra

The typical repair costs for addressing a P0231 code on a 2016 GMC Sierra can range from $200 to $600, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the cost of diagnosing the problem, replacing any faulty components such as the fuel pump relay or fuel pump, and labor charges for the repair work. It's important to note that the actual cost may vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It's recommended to obtain quotes from multiple repair shops to compare prices and ensure a fair cost 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 2016 GMC Sierra Code

1. What does the OBDII code P0231 mean on a 2016 GMC Sierra?

P0231 indicates a low voltage condition in the fuel pump control circuit, which can prevent the fuel pump from functioning properly.

2. What are the common symptoms of P0231 in a 2016 GMC Sierra?

Symptoms include difficulty starting, engine stalling, reduced engine performance, or the engine not starting at all.

3. What causes the P0231 code to appear in a 2016 GMC Sierra?

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

4. How can I diagnose the P0231 code on my 2016 GMC Sierra?

Start by checking the fuel pump relay, inspecting the wiring and connectors for damage, and testing the voltage at the fuel pump. A scan tool can also help monitor live data for further troubleshooting.

5. Can a bad fuel pump trigger the P0231 code on a 2016 GMC Sierra?

Yes, a failing or faulty fuel pump can cause low voltage in the circuit, leading to the P0231 code.

6. How do I fix the P0231 code on my 2016 GMC Sierra?

Repairs may include replacing the fuel pump relay, repairing damaged wiring, cleaning corroded connectors, or replacing the fuel pump if it is faulty.

7. Is it safe to drive a 2016 GMC Sierra with the P0231 code?

Driving with this code is not recommended as it can lead to engine stalling or prevent the vehicle from starting, potentially leaving you stranded.

8. Can a blown fuse cause the P0231 code on a 2016 GMC Sierra?

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

9. Does the P0231 code always mean the fuel pump is bad on a 2016 GMC Sierra?

No, the code can also be caused by issues with the wiring, connectors, fuel pump relay, or even the PCM.

10. Will clearing the P0231 code fix the problem on a 2016 GMC Sierra?

Clearing the code will reset the check engine light, but the underlying issue must be addressed to prevent the code from returning.

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