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P0628 Lincoln Code - Fuel Pump 'A' Control Circuit Low

Quick Answer

The P0628 diagnostic trouble code for Lincoln vehicles indicates an issue with the fuel pump 'A' control circuit being detected as operating at a lower than specified voltage level. Common causes include Faulty fuel pump control module, Damaged wiring or connectors in the fuel pump 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
P0628 Lincoln indicates Fuel Pump 'A' Control Circuit Low.
Common causes
Common causes include Faulty fuel pump control module, Damaged wiring or connectors in the fuel pump 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 12, 2024
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Code P0628 Lincoln Description

The P0628 diagnostic trouble code for Lincoln vehicles indicates an issue with the fuel pump 'A' control circuit being detected as operating at a lower than specified voltage level. This code is typically triggered when the powertrain control module (PCM) detects that the fuel pump control circuit is not functioning within the expected parameters. 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 this circuit operates at a low voltage level, it can result in inadequate fuel delivery, leading to poor engine performance, reduced fuel efficiency, and potential drivability issues.

OBDII Code P0628 Lincoln - Fuel Pump 'A' Control Circuit Low
P0628 Lincoln Code - Fuel Pump 'A' Control Circuit Low

Common Causes of P0628 Lincoln

  1. Faulty fuel pump control module
  2. Damaged wiring or connectors in the fuel pump circuit
  3. Malfunctioning fuel pump relay
  4. Issues with the PCM

Symptoms of P0628 Lincoln

  1. Hard starting
  2. Stalling
  3. Rough idling
  4. Hesitation during acceleration
  5. Engine misfires

How to Fix P0628 Lincoln

  1. Perform a thorough inspection of the fuel pump control module, wiring, and connectors to check for any signs of damage or corrosion.
  2. Test the fuel pump relay to ensure it is functioning correctly and replace it if necessary.
  3. Check the PCM for any fault codes or issues and address them accordingly.
  4. If no visible issues are found, consider testing the fuel pump itself to ensure it is operating within specifications.
  5. Clear the diagnostic trouble code from the PCM and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0628 Lincoln

The typical repair costs for addressing a P0628 fuel pump 'A' control circuit low code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost for parts and labor to address this problem can range from $200 to $500. However, it is important to note that the actual cost may be higher or lower based on factors such as the vehicle's make and model, the location of the repair shop, and any additional components that may need to be replaced. It is recommended to obtain a detailed estimate from a qualified mechanic to determine the precise costs involved in resolving this issue.

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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 Lincoln Code

1. What are common symptoms of OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low?

Symptoms may include difficulty starting the vehicle, engine stalling, and a lack of power while driving.

2. What are the possible causes of OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low?

Possible causes include a faulty fuel pump control module, damaged wiring or connectors, or a defective fuel pump relay.

3. How can I diagnose the issue causing OBDII code P0628 in my Lincoln related to the Fuel Pump 'A' Control Circuit Low?

Perform a thorough inspection of the fuel pump control module, check for damaged wiring or connectors, and test the fuel pump relay for proper functionality.

4. Can driving with OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low cause further damage?

Continuing to drive with this code may lead to fuel pump failure, engine stalling, or other serious issues, so prompt diagnosis and repair are recommended.

5. What are some repair tips for resolving OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low?

Consider replacing the fuel pump control module, repairing any damaged wiring or connectors, and testing or replacing the fuel pump relay as necessary.

6. Is it safe to reset the OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low without addressing the underlying issue?

Resetting the code without fixing the root cause may temporarily turn off the check engine light, but the problem will likely reoccur and potentially lead to more severe issues.

7. Can a DIY enthusiast repair OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low?

While some basic troubleshooting and repairs may be possible for experienced DIYers, diagnosing and fixing this code often requires specialized tools and knowledge best handled by a professional mechanic.

8. How much does it typically cost to repair OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low?

Costs can vary depending on the exact cause of the issue, but expect to pay for parts such as a fuel pump control module or relay, as well as labor for diagnosis and repair.

9. Will OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low affect fuel efficiency?

Yes, this code can impact fuel efficiency due to issues with the fuel pump control circuit, potentially causing the vehicle to run rich or lean, leading to poor gas mileage.

10. How urgent is it to address OBDII code P0628 in a Lincoln related to the Fuel Pump 'A' Control Circuit Low?

It is important to address this code promptly to prevent potential engine stalling, fuel pump failure, or other drivability issues that could compromise the safety and performance of the vehicle.

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