Transmission failsafe program

My transmission failsafe program message came on my dash . Did a manual reset of the computer didn't work. Changed the battery as well because I read it could be the battery or aletnator that did not work as well. When i put the car in reverse I get a knocking noise , worried it's something to do with the transimission . Any advice appreciated . Thanks

My car has 95000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
When you get the transmission fail safe warning, it means the transmission controller has detected a fault in the transmission or in the various sensors that it reads. The controller can adapt to a certain amount of wear and tear in the transmission, but when it reaches a point where it can no longer adapt, it will go into failsafe so that the transmission can continue to operate, though not as well. The transmission controller will have stored fault codes to help specify where the problem lies. You need to have this thing checked out by someone with the capability to read and interpret the codes. By contacting Your Mechanic, you can have a technician com to your home or office to check out your BMW, read the codes and let you know what steps you need to take to fix it.

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It means that the ECU (Electronic Control Unit) has detected a problem in the transmission itself or in one of the devices or sensors that controls it. The ECU then substitutes whatever information its not getting with a fixed value so the transmission can continue to operate in spite of the failure.
Note: A transmission in fail-safe (or limp mode) will sometimes correct itself when the engine is shut off and restarted. So, if you find yourself in this situation, find a safe place to pull off the road and shut the engine off. Wait one minute and then restart the engine.
FAIL SAFE means the transmission is in limp mode, in limp mode you only have one gear and no torque converter lock up. If you see this message, pull over and have the vehicle towed to where you can work on it, unless it is a short drive. The BMW E39 I received this message on was stuck in fourth gear.
This is due to a failing alternator or a failing battery. It can also be caused by a bad connection at the negative battery cable. All of these are common issues. I usually start by load testing the battery and alternator first. If those are fine, then I check the ground connections.
What Causes the Engine Failsafe Mode? Sometimes the engine failsafe mode is triggered by an actually damaged component, such as an oil pump, timing chain or belt, crankshaft or camshaft, or other internal engine components.
Hydraulic system malfunctions or physical damage of the automatic transmission. During the process of self-diagnostics, the ECU can detect a malfunction in the mechanical part of the automatic transmission and, as a result, go into failsafe mode.
Turn off your vehicle`s ignition and wait patiently for 5 to 10 seconds. Start the engine and allow it to idle for several seconds. Switch off the ignition and wait patiently for another 30 to 40 seconds. Repeat these steps 2 to 3 times in order to reset your vehicle`s transmission control module.
How to get your car out of limp mode. You may be able to reset the car by switching it off and on again after about 30 seconds. If the warning lights disappear and the car behaves normally, then it may have just been a temporary glitch.
The “Transmission Malfunction” light will come on when the car suspects there to be a problem with the transmission. Your car will typically put the car into “limp mode” when this light comes on. This “Limp Mode” limits the car in speed in an attempt to save the transmission from further damage.
A BMW gearbox fault means there is an issue with your transmission. If there is a problem with the transmission on your BMW, you could experience a range of issues with your vehicle and even find it goes into `limp mode` to prevent further damage – meaning it needs to be towed to a mechanic.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

There is automatic transmission fluid in a manual transmission. Is it okay to leave or do I need manual transmission fluid?
ANSWER : This would depend on what the manufacturer recommends. Many manual transmissions do take automatic transmission fluid. If your transmission has ATF in it, it is very likely that it is supposed to have that in there. If not, it is likely that the transmission would not function properly with the wrong fluid. Many manual transmissions will also take engine oil as a lubricant. The best way to know for sure is to check your owner’s manual or call your local General Motors dealership to inquire.

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2013 Ford Focus Transmission Issue. Is it worth keeping the car?
ANSWER : Hi There,
This is a known issue in this generation Ford Focus and some Fiestas with the "Power Shift" transmission and there have been numerous recalls and lawsuits. Although, it is would be difficult to determine how much longer your transmission will last given the fact that you have many new parts, I would not recommend junking the car as it may still provide some valuable life left for you. I would recommend taking it to the dealer to see if these parts may be covered under the recall.

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Kia Optima 2004 v6 LX new engine old transmission no problems before with transmission now my transmission is shifting a high rpm
ANSWER : Hi There,
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.

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security key programs garage door, but not security gate
ANSWER : It is possible the gate has a rolling code, which will require an extra step of pressing the learning button on the gate transmitter while programming your HomeLink button. The Audi website has a customer service chat line where they can walk you through the programming. You may need a staff member from the community who has access to the gate receiver to complete the programming.

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Transmission fluid comes up out of the transmission vent tube attached to the transmission dipstick tube
ANSWER : Hi there. Fluid seepage out of the vent tube can sometimes be normal, but can also be caused by overfilling. Has a service been performed recently? Perform a fluid level and condition inspection by having the engine at idle, on a level surface, warmed up engine, and remove the dipstick and cleaning it with a shop towel. Reinsert the dipstick and fully remove to a horizontal position for inspection. Make sure the fluid is not milky, very dark, or has contamination. The level should be in the safe zone marked on the stick.

Have an inspection by a qualified technician determine if any problems truly do exist and provide you with some assurance. YourMechanic has several technicians available that can assist you with a transmission leak inspection and can perform a transmission fluid service if needed.

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Can too much transmission fluid cause speedometer malfunctions?
ANSWER : Hi there. In most cases when you overfill the transmission fluid it can cause excessive foaming of the fluid or possible internal component failure due to excessive pressure inside the hydraulic lines. Sensors like the speed sensors however are rarely impacted by this situation. However, in regards to the possibility of probability of this; I would say perhaps a 10% chance.

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Transmission failsafe program comes on dash 2001 BMW X5
ANSWER : Hi there – the first task is to have the transmission fluid level checked. This will require technical assistance and a lift, since there is no dipstick on this model, and the fluid level "port" is underneath. Correct fluid temperature is also required. If the fluid level is correct, and this is "lifetime" fluid, I would then recommend a transmission inspection by a reputable transmission shop, or by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs. There may be a problem with fluid pressure internally to the transmission (pump or valve issue), or a transmission clutch problem.

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Does this transmission have a transmission filter that can or needs to be change at certain miles?
ANSWER : Most vehicles have an internal transmission filter that can be changed by removing the transmission pan. Some diesel trucks will have an external filter that can be changed just like an oil filter. The transmission filter is usually recommended to be replaced either when the transmission fluid is replaced or around 100,000 miles depending on the manufacturer’s recommendation.

As for which fluid to use, I would recommend looking in you owners manual. Your owners manual will list all fluid specifications that are required for your vehicle including capacity and type. I would always recommend using what the manufacturer recommends for the vehicle.

If you’d like to have your transmission fluid and filter serviced, consider YourMechanic, as one of our mobile technicians can come to your home or office to do so.

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