B14F9 Code - Low Side Driver 2
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
- B14F9 indicates Low Side Driver 2.
- 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 B14F9 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 B14F9?
- Faulty Upfitter Interface Module
- Upfitter Interface Module harness is open or shorted
- Upfitter Interface Module circuit poor electrical connection
How to Fix the DTC B14F9?
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
B14F9:12 Low Side Driver 2 Short To battery
B14F9:13 Low Side Driver 2 Open Circuit
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B14F9 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
- B14F9 Ford — Low Side Driver 2
Frequently Asked Questions about B14F9 Code
1. What are common symptoms of OBDII code B14F9 (Low Side Driver 2)?
- Common symptoms include malfunctioning turn signals, hazard lights not working, or issues with the vehicle's exterior lighting.
2. What can cause the OBDII code B14F9 to trigger?
- The code B14F9 is typically triggered by a fault in the low side driver circuit responsible for controlling the operation of specific vehicle lights.
3. How can I diagnose the OBDII code B14F9 issue?
- Diagnosis involves using a diagnostic scanner to retrieve the code, checking the affected lights for functionality, and inspecting the wiring and connections related to the low side driver 2 circuit.
4. What are some possible repair tips for OBDII code B14F9?
- Repair tips may include checking and replacing blown fuses, repairing damaged wiring, replacing a faulty low side driver module, or addressing any issues with the vehicle's lighting system.
5. Can OBDII code B14F9 be fixed at home, or do I need professional help?
- Depending on your knowledge and skills, you may be able to fix the issue at home by following repair guides or consulting with automotive forums. However, seeking professional help is recommended if you are unsure about the repair process.
6. Is it safe to continue driving with the OBDII code B14F9 illuminated?
- While the vehicle may still be operable with this code triggered, it is not recommended to ignore the issue, especially if it affects crucial lighting functions like turn signals. It is advisable to address the problem promptly.
7. Are there any common mistakes to avoid when dealing with OBDII code B14F9?
- Common mistakes include overlooking simple fixes like checking fuses, ignoring intermittent light malfunctions, or assuming the issue will resolve on its own. Thorough diagnosis and proper repair are essential.
8. Will resetting the OBDII system clear the B14F9 code permanently?
- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the B14F9 code is not addressed, it is likely to reappear once the problem resurfaces.
9. How do I prevent OBDII code B14F9 from occurring in the future?
- To prevent the B14F9 code from recurring, regular maintenance of the vehicle's lighting system, timely repairs of any lighting issues, and addressing electrical problems promptly can help avoid triggering this code.
10. Can a dead or weak car battery cause the OBDII code B14F9 to appear?
- A dead or weak car battery can potentially cause electrical issues, including triggering the B14F9 code. It's advisable to ensure the battery is in good condition and properly charged to prevent such problems.
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