AutoCodes – Ford – B14F8 Ford

B14F8 Ford Code - Low Side Driver 1

Quick Answer

The Upfitter Interface Module utilizes a Field Effect Transistor (FET) protective circuit strategy to protect the low and high side driver output circuits. Common causes include Faulty Upfitter Interface Module, Upfitter Interface Module harness is open or shorted, Upfitter Interface Module 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: B14F8 Ford indicates Low Side Driver 1.
Common causes: Common causes include Faulty Upfitter Interface Module, Upfitter Interface Module harness is open or shorted, Upfitter Interface Module 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 1,529

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 Apr 23, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B14F8 Ford Description

The Upfitter Interface Module utilizes a Field Effect Transistor (FET) protective circuit strategy to protect the low and high side driver output circuits. Output loads (current levels) are monitored for excessive current (which is typically caused by a short circuit to ground) and are shut down (turns off the voltage or ground provided by the module) when a fault is detected.
A short to battery voltage occurring on either a low or high side driver output circuit may also result in a temporarily loss of operation in the output circuit (no voltage or ground will be applied to the output circuit) to protect the module against a potential over temperature condition.
A Field Effect Transistor (FET) is a type of transistor that the module uses to control and monitor current flow on module output circuits. The Field Effect Transistor (FET) protection strategy prevents damage from occurring to the module.
Whenever a FET is turned off because of a fault condition a Diagnostic Trouble Code (DTC) is set in the module which corresponds to the specific fault observed. The module resets the Field Effect Transistor (FET) protection and allows the circuit to function when the fault is corrected or the ignition is cycled off and then back on. The ignition should always be cycled from off to on after a fault is corrected to ensure that FET protection is reset.

OBDII Code B14F8 Ford - Low Side Driver 1 - AutoCodes.com — B14F8 Ford Code - Low Side Driver 1

What does this mean?

What are the Possible Causes of the DTC B14F8 Ford?

Faulty Upfitter Interface Module
Upfitter Interface Module harness is open or shorted
Upfitter Interface Module circuit poor electrical connection

How to Fix the DTC B14F8 Ford?

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 does this mean?

Code Tech Notes

B14F8:11 Low Side Driver 1 Short To Ground
B14F8:12 Low Side Driver 1 Short To battery
B14F8:13 Low Side Driver 1 Open Circuit

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B14F8 Ford 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.

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Need Help with the Code?

Get the B14F8 Ford 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 B14F8 Ford Code

1. What are the common symptoms of OBDII code B14F8 for Low Side Driver 1 in a Ford vehicle?

- Common symptoms include issues with the fuel system, such as difficulty starting the engine, rough idling, misfiring, or a decrease in engine performance.

2. What can cause the OBDII code B14F8 for Low Side Driver 1 to trigger in a Ford car or truck?

- This code is typically triggered by a malfunction in the low side driver circuit, which controls the fuel injectors or other components related to fuel delivery.

3. How can I diagnose the OBDII code B14F8 related to the Low Side Driver 1 in my Ford vehicle?

- Diagnosis involves using a diagnostic scanner to read the trouble code, checking the wiring and connections related to the low side driver circuit, and testing the fuel injectors for proper function.

4. Are there any common mistakes to avoid when dealing with the B14F8 trouble code in a Ford vehicle?

- One common mistake is replacing components like fuel injectors without first checking the wiring and connections for faults, which could be the actual cause of the issue.

5. Can a DIY enthusiast repair the OBDII code B14F8 for Low Side Driver 1 in a Ford, or is professional help necessary?

- Depending on the underlying cause, DIY enthusiasts with good mechanical skills and proper tools may be able to repair this issue, but complex wiring or circuit problems may require professional assistance.

6. Is it safe to continue driving a Ford vehicle with the OBDII code B14F8 related to the Low Side Driver 1 issue?

- It is not recommended to drive the vehicle for an extended period with this code active, as it can lead to further engine damage and poor performance.

7. How much does it typically cost to repair the OBDII code B14F8 for Low Side Driver 1 in a Ford vehicle?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing faulty components, repairing wiring, or addressing other related problems. Costs can range from a few hundred to over a thousand dollars.

8. Can a faulty fuel pump be a potential cause of the OBDII code B14F8 in a Ford vehicle?

- While the low side driver circuit issue is more commonly associated with this code, a faulty fuel pump or related components could also contribute to triggering the B14F8 code.

9. Are there any specific maintenance tips to prevent the recurrence of the OBDII code B14F8 in a Ford car or truck?

- Regularly inspecting and maintaining the fuel system, ensuring proper wiring connections, and using high-quality fuel can help prevent issues that may lead to the B14F8 trouble code.

10. How long does it typically take to repair the OBDII code B14F8 for Low Side Driver 1 in a Ford vehicle?

- Repair times can vary based on the complexity of the issue and the availability of parts. Simple fixes may take a few hours, while more involved repairs could require a day or more to complete.