The car’s transmission system is responsible for moving a vehicle forward and in reverse, ensuring a smooth and proper function all the time. Therefore, when your car won’t go in reverse or forward, the chances are that there is a problem with the transmission. There are several factors that may cause issues with the transmission.
Let’s take a look at all the possible reasons your car won’t go in reverse:
WHY CAR WON’T GO IN REVERSE IN MANUAL & AUTOMATIC TRANSMISSION
There are two types of car transmission, manual and automatic. We will discuss problems with the transmission system of both types.
LOW TRANSMISSION FLUID LEVEL (MANUAL AND AUTOMATIC)
The primary reason any car won’t go in reverse sometimes or at all is due to low transmission fluid levels. If your vehicle is running on low transmission fluid, the inadequate lubrication causes overheating of gears, leading to hard shifts. In other cases, there is a fluid leak. You must pay immediate attention to this fault because leaking fluid can cause other problems and stop your car from going in either direction.
DIRTY TRANSMISSION FLUID (MANUAL AND AUTOMATIC)
The transmission fluid can get polluted with debris over time, putting a strain on the system as a whole. If that’s the case and the car transmission fluid is found dirty, your car won’t go in reverse and would struggle in the process. You may also find contaminated transmission filters that would make matters worse for you. Therefore, you must always keep a check and whenever required change the car transmission fluid or flush it frequently.
BROKEN REVERSE GEAR TEETH (MANUAL AND AUTOMATIC)
Broken reverse gear teeth also prevent the vehicle from moving in reverse and usually affects the manual transmission more than automatic ones. This is usually because of driving habits, especially when new drivers fail to shift gears properly.
You can also detect this problem by keeping your ears alert for a loud clicking or clunking noise when shifting gears due to the worn-out reverse gear teeth. There is no quick-fix – it requires an expensive replacement of the damaged teeth.
FAILING TRANSMISSION SELECTOR SWITCH
The transmission selector switch is responsible to send a signal to the car’s computer for making it aware that it has to switch into reverse gear. When the switch malfunctions, the signal is no longer sent, and the car won’t go in reverse any longer.
THERE IS A DAMAGED LOCKOUT RING (MANUAL)
Lockout ring functions to stop the driver from accidentally shifting the transmission into reverse when the vehicle is moving. It is because this accidental shift is extremely dangerous and can cause fatal damages to both the car and driver. When the lockout ring becomes misaligned or damaged, the car won’t go in reverse manual transmission.
DAMAGED TRANSMISSION SYSTEM
A worst-case scenario is when the entire transmission system has weathered away, causing not one but a group of parts to stop the vehicle from going into reverse. In that case, you would have to repair the transmission system or replace it to ensure the smooth performance of your vehicle.
A crumbling transmission system might be saved by regular servicing and carrying out minor repairs. But when your car won’t go in reverse at all, you have no other option but to find a specialist who would replace the entire system.
WORN-OUT VALVE BODY (AUTOMATIC)
The valve body, if you didn’t already know, is the central control of every automatic transmission system. The body is like a network that transfers transmission fluid to several valves, which in turn, activate the appropriate clutch pack to shift into gears for each driving speed. Therefore, a lousy or frayed transmission valve body is another leading cause why your car won’t go into gear when running or reverse gear is not working in automatic transmission.
BAD TRANSMISSION POSITION SENSOR (AUTOMATIC)
In automatic transmission systems, there are position sensors that work for the Powertrain Control Module (PCM) to signal where the transmission should shift to in a specific gear. When the electronic sensor starts to malfunction, the car is ideally prevented from going into reverse. The problem may also activate the limp mode which translates to the car not going above 3rd gear.
Typically, you have to manually diagnose the vehicle to determine a faulty transmission position sensor. It will come up with the P0705 diagnostic trouble code (DTC) but because many other factors can trigger it, it’s recommended to consult a mechanic.
FAULTY ENGINE GASKETS
This cause is probable when almost everything looks fine in the transmission system yet the car won’t go in reverse. In such cases, there is always a faulty engine gasket that stops the gears in the system to shift smoothly. Fortunately, not only is this error an unlikely one most of the time but it can also be easily fixed with a replacement. When everything else goes in vain, and you’re unable to find the root of the problem, only then head over to check the engine gaskets.
FREQUENTLY ASKED QUESTIONS
CAN A BAD TRANSMISSION FILTER CAUSE NO REVERSE?
Yes, because transmission filters play a critical role in the overall optimal functioning of the system. If it’s clogged, failing, or damaged, it’s very likely that the car won’t go in reverse.
CAN A BAD SPEED SENSOR CAUSE NO REVERSE?
The speed sensor when malfunctioning ends up moving the car into the ‘fail safe’ or ‘limp home mode.’ When this happens, the transmission will not allow the vehicle to move beyond the 3rd gear. However, a defective speed sensor is viable by an illuminated warning light on the dashboard, signalling that it’s time to repair or replace the speed sensor.
These are the major causes that hamper the transmission system, due to which the car won’t go in reverse sometimes. Always keep it in mind to be kind to the transmission system by coming to a complete stop before shifting. Do not ever race the engine in neutral and then shift into the drive as it can internally damage the transmission.
Also, it goes without saying that you must follow a car maintenance checklist and flush off transmission fluid to keep the health and lifespan of your car up and always running. In case your car needs frequent costly repairs and replacement at regular intervals, then it’s better to get another one. You may opt to buy a used car in the UAE of any of your preferred auto brands that fit your budget and needs.
Stay tuned to UAE’s top auto blog for more information related to different car parts, their working and repair guides.
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