My enclave will not go in reverse and the trans oil smells burnt. Do you think the flex plate is damaged?

do you think it is just the wave plate damage? my enclave will not go in reverse and the trans oil smells burnt. do I have to replace the whole transmission? the last transmission check was in march of this year. I m trying not to lose my job so I'm looking for a reliable tranny for my car which is impossible. the car stays at 40rpms when it broke down.

My car has 133001 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. If your transmission oil is black or burned and the transmission will not go into reverse, then the reverse input clutch is burned and slipping. There is nothing wrong with the flex plate as it would effect all of the gears in the transmission. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transmission.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The 2009 Buick Enclave comes equipped with an automatic transmission that`s prone to gear failure. Usually, this comes to light when the vehicle refuses to shift into reverse and starts slipping while moving between the other gears. To remedy the issue, techs have to replace the transmission.
An automatic transmission that won`t go in reverse is just one symptom of a low transmission fluid level. You may notice fluctuating shifting or an engine that overheats or stalls. Weird things happen when your car`s systems have to work harder than they are supposed to.
If your transmission oil is black or burned and the transmission will not go into reverse, then the reverse input clutch is burned and slipping.
Check to see if the brakes are applied and see if the master cylinder is full of brake fluid. If you need further assistance with your vehicle not moving when putting the transmission in drive or reverse, then seek out a professional, such as one from Your Mechanic, to help you.
Vehicle Speed Sensor (VSS)

The Vehicle Speed Sensor measures vehicle speed. When it fails the transmission can stop shifting or shift late and harsh. A bad VSS may also inhibit overdrive and the converter clutch.

If your car has an automatic transmission, the shift solenoid will shift the gears for you. The transmission control unit will take the information from the engine and speed sensors along with other parts of your vehicle to then decide when to shift gears for power and fuel efficiency.
But if the solenoid malfunctions mechanically, no reverse or delayed and slipping reverse may occur.
A surefire sign of a failing torque converter is when the vehicle won`t shift into a specific gear at all. If you can`t get it to go into reverse or forward drive won`t engage, then it`s probably something wrong with your torque converter.
This means that it is not shifting smoothly from gear to gear or that it is not staying fully in gear as you drive. This can be the sign of internal damage or it may just mean you are due for a standard transmission service to replace the transmission fluid, filter and pan gasket.
Transmission Fluid Low or Poor Condition – Vehicles low on transmission fluid or that are operating with worn out or contaminated fluid are likely to experience hard shift conditions. Lack of adequate lubrication within the transmission can cause several problems, including hard shifting.
Problems Reversing – One common problem that can happen with a clogged filter is difficulty moving in reverse. The lack of fluid flowing through the transmission can cause the reverse gear to lock. This may prevent the car from going in reverse altogether, or it may cause it to hesitate before launching into reverse.
Difficulty while shifting gears can be caused by a variety of issues such as a worn clutch, low or contaminated gear oil, or problems with the shift linkage. Other factors like driving habits, poor clutch adjustment, or mechanical damage can also contribute to difficulty shifting gears.
An indication that a vehicle is not receiving the right mixture of air and fuel is if the vehicle jerks or surges forward at high speed. Several components of the fuel or air intake system could cause this jerking or surging sensation to happen. Issues within these systems can also cause fuel economy to worsen.
Buick Enclave Transmission Issues

Transmission problems are common on all Enclaves, but the 2008 model has the most complaints. Owners have mostly noted transmission problems around 91,000 miles. The vehicle tends to shake, make clunky noises, or both when speeding up or changing gears.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My enclave will not go in reverse and the trans oil smells burnt. Do you think the flex plate is damaged?
ANSWER : Hi there. If your transmission oil is black or burned and the transmission will not go into reverse, then the reverse input clutch is burned and slipping. There is nothing wrong with the flex plate as it would effect all of the gears in the transmission. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transmission.

lost all oil pressure, replaced the oil pump, low oil sensor, oil pressure sensor, oil pan gasket,
ANSWER : The fuel pump will not stay on if you loose oil pressure. This is why it is shutting off. The loss of oil pressure may be from bad crankshaft bearings or camshaft bearings. The engine oil pan should be removed and the oil pump needs to be checked to ensure that you put in the pick up tube seal to the pump and connected the pump to the block. Then remove at least one main bearing cap and inspect the bearings for excessive wear and crankshaft damage. If you need some help with this, consider YourMechanic, as a certified technician can help diagnose the issue with your oil pressure firsthand and help you fix it accordingly.

Just found out that my vehicle has been leaking oil for at least 2 yrs. Would smelling that burning oil smell cause health issues?
ANSWER : Hi Larry. As the co-founder or a non-profit that focuses on education, awareness and screening for respiratory diseases targeting the automotive community, I am happy to answer a few questions for you to clear up some facts. First, there are multiple materials, chemicals, and substances on a vehicle that are emitted from the mechanical actions of the vehicle that MIGHT reduce respiratory function and lead to a diagnosis of COPD (Chronic Obstructive Pulmonary Disease) or other respiratory diseases. However, it is nearly impossible to prove the precise source that can cause respiratory problems. Whether due to excessive exposure to these substances, social choices (smoking), workplace environment, indoor air quality in the home, even certain genetic conditions, it is possible for lung function to decrease over time. At Right2Breathe.org, we always recommend that anyone that is experiencing any breathing issues, visits their primary care physician and have them complete a spirometry exam (a non-evasive breathing test). This will allow them to measure your lung’s function and begin the official diagnosis process. Thank you very much for asking this important question. Feel free to contact us if you have further questions.

replace oil pump and pick up tube
ANSWER : Hi there. Typically when the oil pressure changes based on the type of oil you are using, it’s an issue with the pick-up itself. Quite often, the wrong sized or style of oil pump or a pick-up line that is too short / long, can cause inconsistent oil pressure. It’s also possible as you indicated that the oil pickup screen is clogged with sludge or debris (especially if the engine has not been rebuilt). It might be a good idea to have a professional mobile mechanic complete an oil pressure light inspection to help you pinpoint the source of the issue and recommend the right repairs.

Oil still leaking after I changed oil filter
ANSWER : Unless there is an imperfection (e.g., serious pitting or irregularities) on the engine mounting base for the filter gasket, the leak is probably not at the filter. There are other adjacent potential leak spots such as the oil pan gasket, oil pressure sending unit and so forth. If the leak is significant at all, merely thoroughly cleaning the suspect area and running the engine while looking for the leak should be sufficient. If you still can’t find the leak origin, a UV visible dye can be added to the engine oil which will then make the leak point visible using a detection light. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an oil leak diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

I smell oil burn smell in car. This started after my last oil change. What could it be?
ANSWER : Depending on how long ago your last oil change was, this may be the result of an oil leak or potentially oil that has dripped on the motor somewhere that has been heated up. This happens occasionally when changing oil and is usually not a cause for concern, however if there is any indication of an oil leak (even a slow or slight leak), this will need to be looked at by a qualified mechanic such as one from YourMechanic as this will only continue to get worse.

think i put wrong oil in car went few miles lose power car dies oil in spark plugs still starts low oil blinking light before die.
ANSWER : Hello. If you put too thick of an oil in the car, then you may have damaged the engine bearings but this should not have caused oil to get in to the spark plugs unless the oil got into the intake of the engine or one of the pistons rings broke. If you ran it without oil and then tried to put oil in thinking it would be okay after that, then you were not that lucky and broke or damaged all of the rings on the pistons. If you would like to have this looked over, a certified professional from YourMechanic can come to your car’s location to inspect the stalling issue and go over all of the relevant systems for a better diagnosis.

My car is leaking oil i got an oil change for it last month but it is still leaking oil what will cause my car to leak oil ?
ANSWER : Most older cars have oil leaks. Sealing technology has just not kept up with mechanical improvements to engines so much so that leaks often kill engines rather than mechanical problems. So, it is not unexpected at all to have an, indeed many, oil leaks on a 23 year old car. Oil leaks vary hugely in terms of severity and priority of repair. Oil leaking onto a hot engine manifold is the worst case (the oil can start a fire; at best, you are left breathing oil fumes in the cabin, as the oil burns off of the manifold) while de minimus seepage of oil at the oil drain plug or oil pan gasket, while annoying and messy, if limited enough is not an emergency. Some leaks are easy to repair, while others literally require the engine to be removed just to get physical access to all the leak points. In your circumstance, if you smell burning oil, oil is probably leaking onto a hot engine part such as the exhaust manifold. A certified Mechanic, dispatched by YourMechanic right to your location, can perform an oil leak diagnostic and then let you know of your repair options and costs.

As far as the check engine light, that is not related to the oil leak(s). If you request a check engine light diagnostic, a certified mechanic from YourMechanic would use a code scanner to retrieve the specific diagnostic trouble code(s) from your car’s PCM that have caused the check engine light to illuminate. Using those codes, the appropriate individual vehicle components or sub-systems (often a sensor, circuit, and the like) are then carefully tested, based on specifications set forth in your car’s Factory Service Manual, to pinpoint the cause of the fault or the reason why the check engine light has illuminated. Once the faulty part or component is identified, it is explained to your satisfaction and the mechanic will let you know of the cost to repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.