Engine-Codes - Generic - B14FB

B14FB Code - Low Side Driver 4

- Code Popularity: 525 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC B14FB?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Upfitter Interface Module
  • Upfitter Interface Module harness is open or shorted
  • Upfitter Interface Module circuit poor electrical connection

Code 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

⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC B14FB?

Check 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 pins.

Search for B14FB Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

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

What are Code Possible Symptoms?

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

What Does the B14FB 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.

B14FB Code - Low Side Driver 4

Need more Information on the Code?

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

Code B14FB Information for Specific Makes

Need Help with the Code?

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