The shift lock solenoid fuse is a crucial component of a car’s automatic transmission system that prevents the shifter from moving out of the park position without pressing the parking brake pedal.
When this fuse fails, the driver may find it challenging to shift gears, which can be a safety hazard.
This blog will explore possible causes of shift lock solenoid fuse failure and other relevant information!
What Is The Shift Lock Solenoid Fuse?
The shift lock solenoid is a safety feature that keeps the driver from shifting out of the park without pressing the brake pedal.
The shift interlock solenoid fuse is a protective device that protects the solenoid from short-circuiting or overheating.
Where is the shift lock solenoid located? The solenoid is located near the shifter assembly and is activated by an electrical signal from the brake lights.
When you step on the brake pedal sensor, the brake light switch sends a signal to the solenoid, unlocking the shifter lock so that you can shift into gear.
If the solenoid draws too much current or becomes stuck, it can blow out the fuse, disabling the solenoid and preventing the shifter from unlocking.
This can be a serious safety issue, as the driver will be unable to shift out of Park position and may be stranded or unable to move the car.
What Can Make The Shift Lock Solenoid Fuse Fail?
When the 2017 Nissan Sentra shift lock solenoid fails, it can cause a number of issues, such as electrical issues, overloading, wear and tear, a faulty solenoid, moisture, and a dead car battery.
Electrical Issues
Electrical issues can prompt a shift lock solenoid failure. This can include problems with the car’s electrical system, such as a short circuit, a faulty switch, or a malfunctioning solenoid control unit.
My car used to be equipped with aftermarket electronics and poorly installed equipment, which overloaded the electrical system and resulted in a blown-out shift interlock solenoid fuse.
Overloading
The shift solenoid may stop working because the electrical system is overloaded.
This might occur when too many electrical components are used simultaneously or when a part is utilized incorrectly.
I once ran my headlights when the car was off, and it drained the my battery and blew the shift lock fuse system.
Wear And Tear
Over time, the solenoid can experience wear and tear that can lead to failure of the solenoid or its associated fuse.
As the solenoid ages, its internal components will wear out and become less efficient at performing their function.
This eventually ends up with increased electrical resistance, which can overheat the solenoid.
Additionally, physical wear and tear can lead the brake shift interlock to become misaligned or malfunction, which explains a fuse failure.
Faulty Solenoid
The transmission shift solenoid unlocks the shifter when the brake pedal is depressed. If the solenoid is damaged or fails, it may cause the fuse to blow.
My solenoid malfunctioned when the system contained moisture or the solenoid was subjected to extremely high or low temperatures.
The solenoid can sometimes be fixed, but it is usually necessary to replace it.
If you suspect a faulty component, it is best to have it checked by a repair shop to avoid any further damage to the car.
Moisture
Moisture is another factor that may put an end to the shift lock solenoid fuse, as it can seep into the fuse box and electrical circuit.
This is likely to happen to my car in wet conditions and when my car is parked in an area with moisture in the air.
Moisture can also wreak havoc on the solenoid, as the water can cause damage to the electrical components.
It even left rust on my shift lock control unit and broken wire, blocking my brake shift interlock actuator from working properly.
Broken Shift Interlock System
The shifter interlock makes it impossible to move the shifter from the “Park” position without depressing the brake pedal.
The shift lock solenoid fuse might also blow due to a defective EPB shift interlock system.
The issue could occur if the interlock gets jammed or damaged, making it impossible for the brake pedal to engage the interlock switch.
Consequently, the fuse can explode should the shift lock solenoid continue to be powered on.
Car Battery
The car’s battery may also cause the shift lock solenoid fuse box to fail.
The solenoid may malfunction if the battery is weak or doesn’t hold a charge, which will break down the shift lock solenoid fuse.
This is because the solenoid needs enough power to function effectively, and a weak battery cannot supply it with the required voltage.
FAQs
Is It Easy To Fix The Faulty Shift Lock Solenoid Fuse?
The difficulty of fixing a bad shift lock solenoid fuse can vary depending on the underlying reason for the issue.
For example, when I have a blown fuse or a loose connection, I can remedy the problem myself.
However, a qualified mechanic might be needed if the problem is due to a bad solenoid or more complicated electrical issues.
How To Test Shift Interlock Solenoid?
To test the shift interlock solenoid, you can use a multimeter to check for continuity and resistance.
You can also check for power and ground at the solenoid connector while attempting to shift out of the park.
It is recommended to refer to the vehicle’s service manual for specific testing procedures and specifications.
If you are unsure how to test the solenoid, I advise seeking assistance from a professional mechanic.
What Fuse Controls The Gear Shift?
The fuse that controls the gear shift or the shift lock solenoid is typically labeled as “STOP” or “IGN” in the fuse box.
However, the exact location and labeling of the fuse may differ in each make and model of the vehicle.
Conclusion
The shift lock solenoid fuse plays a critical role in ensuring the safe operation of a car’s transmission system.
It’s crucial to address the issue immediately once you notice any signs of failure to avoid safety hazards while driving.
Remember to turn to professional assistance if unsure about performing any of the procedures discussed in this article.