![]() However, if there’s an obstruction, shifting could be delayed or erratic. It resembles a maze, pushing fluid through a particular set o passageways when it’s needed. With the automatic transmission, the valve body is responsible for directing hydraulic fluid to the valves. It can also prevent the vehicle from starting if the data isn’t transferred that the car is in Park or Neutral. When the sensor fails, the car may not shift into Reverse or it could shift into a gear you haven’t chosen. To start a car, the gear shifter must be located in the Park or Neutral spot, which is why cars have a lever sensor. This sensor is responsible for telling the car what gear the shifter is in. It could also cause problems with getting into other gears, especially over third. With a faulty sensor, the system may not know to go into Reverse. This data is used to regulate shifting pressure during gear changes and it helps the computer decide what gear is to be engaged. The transmission range sensor monitors the speed of this vital component. When trouble arises, you may have the Reverse problem, as well as delayed or unpredictable shifting patterns. The transmission shift solenoids are designed to control fluid flow. In fact, this problem has been common with the FNR5 transmission. ![]() Normally speaking, a bad shift solenoid will cause trouble with upshifts as well as Reverse, but it’s not impossible to only have trouble backing up. If the fluid is burnt or old, it can no longer provide the support needed for gears to shift, causing you trouble when you try to put the car in Reverse. Fluid can leak from the pump or any of the hoses.Īdditionally, contaminated fluid is just as dangerous as when it’s low. You may be dealing with a leak that requires repair. You should also notice trouble getting into any gear.īecause the transmission is a sealed system, you shouldn’t be low on fluid. When the fluid runs low, the transmission may no longer be able to shift into Reverse. It must lubricate the transmission and keep the components from creating friction. If you drive an automatic transmission car, the fluid is imperative to keeping everything running smoothly. Low or Dirty Transmission Fluid Level (Automatic) It could also be a bad gear shifter mechanism, a shifter cable, broken gear teeth, or a clutch that’s to blame.īy examining each possibility, you can see which reason best fits what you are experiencing. Conclusion Reasons Why Your Car Won’t Go In Reverseĭepending on whether you have an automatic or manual car, the fluid could be low or contaminated, a shift solenoid could be bad, a sensor might have failed, or there’s a faulty valve body.
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