AutoCodes – Lincoln – U0109 Lincoln

U0109 Lincoln Code - Lost Communication With Fuel Pump Control Module

Quick Answer

The Powertrain Control Module (PCM) monitors the Fuel Pump Monitor (FPM) circuit for the presence of a duty cycled signal. Common causes include Fuel pump monitor circuit open or short to ground, Fuel pump monitor circuit short to voltage, Damaged Inertia Fuel Shutoff (IFS) switch (if equipped). 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: U0109 Lincoln indicates Lost Communication With Fuel Pump Control Module .
Common causes: Common causes include Fuel pump monitor circuit open or short to ground, Fuel pump monitor circuit short to voltage, Damaged Inertia Fuel Shutoff (IFS) switch (if equipped).
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 2,675

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 Mar 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0109 Lincoln Description

The Powertrain Control Module (PCM) monitors the Fuel Pump Monitor (FPM) circuit for the presence of a duty cycled signal. If the FPM circuit is fixed at a low or high voltage, the PCM begins to increment a counter. The test fails when the PCM is still not detecting a duty cycled signal on the FPM circuit after a calibrated amount of time.

OBDII Code U0109 Lincoln - Lost Communication With Fuel Pump Control Module - AutoCodes.com — U0109 Lincoln Code - Lost Communication With Fuel Pump Control Module

What does this mean?

What are the Possible Causes of the DTC U0109 Lincoln?

Fuel pump monitor circuit open or short to ground
Fuel pump monitor circuit short to voltage
Damaged Inertia Fuel Shutoff (IFS) switch (if equipped)
Damaged fuel pump control module relay

How to Fix the DTC U0109 Lincoln?

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 U0109 Lincoln 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 U0109 Lincoln code?

Need more information on how to fix the U0109 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0109 Lincoln code diagnosed by a professional: Find a repair shop in your area

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 U0109 Lincoln Code

1. What are common symptoms of OBDII code U0109 in a Lincoln indicating lost communication with the fuel pump control module?

Symptoms may include the vehicle stalling, rough idling, difficulty starting, or a non-functioning fuel pump.

2. What are some possible causes of OBDII code U0109 in a Lincoln?

Potential causes include a faulty fuel pump control module, damaged wiring or connectors, a blown fuse, or a software issue.

3. How can I diagnose the issue related to OBDII code U0109 in my Lincoln?

You can start by checking the fuel pump control module's wiring and connectors for any damage or loose connections. Testing the module itself and inspecting related fuses is also recommended.

4. Can a DIY enthusiast repair OBDII code U0109 in a Lincoln?

Depending on the root cause, a DIYer could potentially repair U0109 by replacing a faulty fuel pump control module, fixing damaged wiring, or addressing other similar issues. However, some cases may require professional assistance.

5. Is it safe to continue driving with OBDII code U0109 in a Lincoln?

It is not recommended to drive with this code present, as it could lead to fuel pump failure and potentially result in the vehicle stalling or not starting.

6. How much does it typically cost to repair OBDII code U0109 in a Lincoln?

The cost of repairing U0109 can vary depending on the specific issue causing the code. It may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can a faulty fuel pump control module cause other OBDII codes to appear in a Lincoln?

Yes, a malfunctioning fuel pump control module can trigger other related codes, such as P0230 (Fuel Pump Primary Circuit Malfunction) or P0231 (Fuel Pump Secondary Circuit Low).

8. Are there any preventive maintenance tips to avoid encountering OBDII code U0109 in a Lincoln?

Regularly inspecting the fuel pump control module, ensuring proper wiring connections, and addressing any fuel system issues promptly can help prevent U0109 from occurring.

9. How urgent is it to address OBDII code U0109 in a Lincoln?

It is important to address U0109 promptly to avoid potential fuel system failures and related safety hazards while driving.

10. Can a Lincoln dealership or certified mechanic help with diagnosing and repairing OBDII code U0109?

Yes, seeking assistance from a Lincoln dealership or a certified mechanic is advisable for accurate diagnosis and proper repair of OBDII code U0109 related to the fuel pump control module.