Engine-Codes - Ford - B14FB Ford

B14FB Ford Code - Low Side Driver 4

- Code Popularity: 496 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B14FB Ford?

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

|How to Fix the B14FB Ford Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Code B14FB Ford Tech Notes

B14FB:11 Low Side Driver 4 Short To Ground
B14FB:12 Low Side Driver 4 Short To battery
B14FB:13 Low Side Driver 4 Open Circuit

|What is the Cost to Diagnose the Code B14FB Ford?

Labor: 1.0

The cost to diagnose the B14FB Ford code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your car have Safety Recalls? → Check here

|What are Code B14FB Ford Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B14FB Ford Code Mean?

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.

Low Side Driver 4

|Need more Information on the B14FB Ford Code?

Need more information on how to fix the B14FB Ford code? Get Access to Factory Service Manuals

|Need Help with the B14FB Ford Code?

Get the B14FB Ford code diagnosed by a professional: Find a repair shop in your area