B14FA Code - Low Side Driver 3
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
- B14FA indicates Low Side Driver 3.
- 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.
Code B14FA Description
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.
What are the Possible Causes of the DTC B14FA?
- Faulty Upfitter Interface Module
- Upfitter Interface Module harness is open or shorted
- Upfitter Interface Module circuit poor electrical connection
How to Fix the DTC B14FA?
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.
Code Tech Notes
B14FA:12 Low Side Driver 3 Short To battery
B14FA:13 Low Side Driver 3 Open Circuit
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B14FA 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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Information for Specific Makes
- B14FA Ford — Low Side Driver 3
Frequently Asked Questions about B14FA Code
1. What does OBDII code B14FA mean?
Code B14FA refers to a fault in Low Side Driver 3, typically indicating an issue with the control circuit or the associated component it operates.
2. What are common symptoms of B14FA?
Symptoms may include malfunctioning or unresponsive components (e.g., lights, actuators, or motors) controlled by Low Side Driver 3, and the illumination of the check engine or warning light.
3. What causes the B14FA code to trigger?
Common causes include a short to ground or power in the circuit, damaged wiring, a defective Low Side Driver module, or a failure in the component being controlled.
4. How can I diagnose the B14FA code?
Diagnosis involves visually inspecting the wiring and connectors, checking for shorts or open circuits, using a multimeter to test continuity, and verifying the operation of the associated component.
5. Can I drive with the B14FA code active?
It depends on the affected component. If the fault impacts a critical system, such as safety or performance-related components, driving is not recommended.
6. How do I fix the B14FA code?
Repairs may include replacing damaged wiring, repairing or replacing connectors, addressing shorts in the circuit, or replacing the faulty Low Side Driver or controlled component.
7. What tools are needed to troubleshoot B14FA?
Basic tools include a diagnostic scanner, multimeter, wiring diagram for the vehicle, and possibly an oscilloscope for advanced circuit testing.
8. Can a blown fuse cause the B14FA code?
Yes, a blown fuse in the circuit related to Low Side Driver 3 can cause the code, as it may disrupt power to the driver or controlled component.
9. Is B14FA a manufacturer-specific code?
The code structure follows OBDII standards, but its specific meaning and components involved may vary by manufacturer. Always consult the vehicle's service manual.
10. Does B14FA require reprogramming the ECU after repairs?
In most cases, reprogramming is not required, but clearing the code with a diagnostic scanner and testing the system after repairs is necessary.
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