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P0628 2018 Chevrolet Silverado Code - Fuel Pump Speed Output Circuit Low Voltage

Quick Answer

The P0628 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a Fuel Pump Speed Output Circuit Low Voltage. Common causes include Damaged wiring or connectors in the fuel pump speed output circuit, Faulty fuel pump control module, Malfunctioning 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
P0628 2018 Chevrolet Silverado indicates Fuel Pump Speed Output Circuit Low Voltage.
Common causes
Common causes include Damaged wiring or connectors in the fuel pump speed output circuit, Faulty fuel pump control module, Malfunctioning 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 21, 2024
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Code P0628 2018 Chevrolet Silverado Description

The P0628 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a Fuel Pump Speed Output Circuit Low Voltage. This code is triggered when the powertrain control module (PCM) detects that the voltage signal from the fuel pump speed output circuit is lower than the specified range. The fuel pump speed output circuit is responsible for controlling the fuel pump's speed, which directly impacts the fuel delivery to the engine.

OBDII Code P0628 2018 Chevrolet Silverado - Fuel Pump Speed Output Circuit Low Voltage
P0628 2018 Chevrolet Silverado Code - Fuel Pump Speed Output Circuit Low Voltage

Common Causes of P0628 2018 Chevrolet Silverado

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

Symptoms of P0628 2018 Chevrolet Silverado

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

How to Fix P0628 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the wiring and connectors in the fuel pump speed output circuit to identify any damage or corrosion. Repair or replace any faulty components as needed.
  2. Test the fuel pump control module to determine if it is functioning correctly. Replace the module if it is found to be faulty.
  3. Check the fuel pump itself for any signs of malfunction. If necessary, replace the fuel pump to ensure proper fuel delivery.
  4. Inspect the PCM for any signs of damage or malfunction. If the PCM is determined to be the issue, it may need to be reprogrammed or replaced.
  5. Clear the DTC and test drive the vehicle to ensure that the issue has been resolved and that the fuel pump speed output circuit is operating within the specified range.

Cost to Fix P0628 2018 Chevrolet Silverado

The typical repair costs for addressing a P0628 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of parts such as a fuel pump control module or a new fuel pump can range from $200 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour. Additional costs may include diagnostic time and any necessary reprogramming of the PCM. It's advisable to check with local auto repair shops for a more accurate estimate based on your location and vehicle specifics.

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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 P0628 2018 Chevrolet Silverado Code

1. What does the OBDII code P0628 mean for a 2018 Chevrolet Silverado?

P0628 indicates that the fuel pump speed output circuit is experiencing low voltage, which can affect fuel delivery to the engine.

2. What are the common symptoms of a P0628 code in a 2018 Chevrolet Silverado?

Symptoms include engine stalling, difficulty starting, reduced fuel efficiency, poor acceleration, or the engine not starting at all.

3. What causes the P0628 code to appear in a 2018 Chevrolet Silverado?

Common causes include a faulty fuel pump control module, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or a blown fuse.

4. Can I drive my 2018 Chevrolet Silverado with a P0628 code?

Driving with a P0628 code is not recommended, as it can lead to engine stalling or failure to start, potentially leaving you stranded.

5. How do you diagnose the P0628 code on a 2018 Chevrolet Silverado?

Diagnosis involves checking the fuel pump control module, inspecting the wiring and connectors for damage, testing the fuel pump, and verifying proper voltage in the circuit.

6. How much does it cost to fix a P0628 code on a 2018 Chevrolet Silverado?

Repair costs vary depending on the issue. Replacing a fuel pump control module typically costs $200–$600, while fixing wiring issues may cost less.

7. Can a weak battery cause the P0628 code on a 2018 Chevrolet Silverado?

Yes, a weak or failing battery can cause low voltage in the fuel pump circuit, triggering the P0628 code.

8. How can I fix the P0628 code on my 2018 Chevrolet Silverado?

Repairs may include replacing the fuel pump control module, repairing damaged wiring, replacing a faulty fuel pump, or addressing power supply issues.

9. Is a software update needed to fix the P0628 code in some cases?

In rare cases, a software update to the vehicle's Powertrain Control Module (PCM) may resolve the issue if it's related to incorrect system parameters.

10. How can I prevent the P0628 code from reoccurring on my 2018 Chevrolet Silverado?

Regularly inspect and maintain your fuel pump system, ensure wiring and connectors are in good condition, and replace components like the fuel pump or control module as needed.

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