What would cause a transmission to malfunction?

Here are some possible causes and steps to consider:

Check the transmission fluid level and condition. Shifting issues might be caused by low or filthy transmission fluid. Check that the transmission fluid is at the proper level and seems clean and red. If it is low or polluted, a fluid change and filter replacement may be required.

Transmission Solenoids: Modern automatic transmissions employ solenoids to manage gear shifting. A faulty solenoid might cause the transmission to stay in one gear. If needed, a professional can diagnose and replace malfunctioning solenoids.

Transmission Control Module (TCM): The TCM is in charge of controlling the operation of the transmission. It can cause shifting problems if it malfunctions or receives inaccurate sensor data. Check the TCM for fault codes and functionality.

Wiring and Electrical Issues: Examine the transmission's wiring and electrical connections, especially those to the TCM and sensors. Damaged wires, faulty couplings, or electrical issues can all disrupt transmission operation.
Shifting problems can also be caused by internal mechanical faults within the transmission, such as worn clutches, damaged gears, or a malfunctioning valve body. These problems can be diagnosed and repaired by a competent transmission mechanic.

Transmission Fluid Pressure: Proper gear engagement is dependent on transmission fluid pressure. Shifting might be affected by a malfunction with the transmission pump or pressure regulator. A pressure test can aid in the diagnosis of these problems.

Examine your vehicle for Diagnostic Trouble Codes (DTCs): Even if the knock sensor problem has been rectified, there may be more DTCs associated with the transmission problem. Check for any stored trouble codes with a diagnostic scanner to gain more insight into the problem.

I hope this might be helpful.

A slow and sluggish shift in an automatic transmission can be caused by a variety of issues. Here are some potential causes to consider:

1. Low Transmission Fluid: A common cause of sluggish shifting is low transmission fluid. Check the fluid level and condition, and top it up or replace it if necessary. Low fluid levels can also indicate a leak in the system.
2. Worn Transmission Filter: Over time, the transmission filter can become clogged with debris and dirt, which can hinder the flow of fluid and affect the performance of the transmission. Replacing the transmission filter may help improve shifting performance.
3. Faulty Shift Solenoids: The shift solenoids are responsible for controlling the flow of transmission fluid through the valve body, and if they are damaged or malfunctioning, it can cause slow or sluggish shifting. A professional mechanic can diagnose and replace any faulty shift solenoids.
4. Malfunctioning Torque Converter: The torque converter is responsible for transferring power from the engine to the transmission, and if it is malfunctioning, it can cause slow and sluggish shifting. A professional mechanic can diagnose and replace any faulty torque converter.
5. Worn Clutch Plates or Bands: Over time, the clutch plates or bands in the transmission can wear down, causing poor shifting performance. Rebuilding or replacing the transmission may be necessary to resolve this issue.

It's important to have a qualified mechanic diagnose the issue with your Ford Explorer to accurately determine the cause of the slow and sluggish shifting. They can then recommend the appropriate repairs or maintenance to improve the transmission's performance.

If your 2009 Mercedes-Benz MP3 model truck's gear is not working in automatic mode and only working in manual mode, there could be a few potential causes. Here are a few steps you can try to troubleshoot and solve the issue:

1. Check the transmission fluid level: Make sure that the transmission fluid level is at the correct level and is not low. Low transmission fluid level can cause gear shifting problems.
2. Check the transmission filter: The transmission filter may be clogged, preventing the gears from shifting properly. Replace the filter if necessary.
3. Check the transmission control module (TCM): The TCM is responsible for controlling the automatic gear shifting. If it's malfunctioning, it can cause gear shifting problems.
4. Check the gear selector switch: The gear selector switch may be malfunctioning and preventing the gears from shifting properly.
5. Check the solenoids: The solenoids in the transmission may be malfunctioning and preventing the gears from shifting properly.
6. Check the transmission control linkages: The transmission control linkages may be damaged or disconnected, preventing the gears from shifting properly.

If you are not comfortable with checking these things, it's best to take the vehicle to a certified Mercedes-Benz mechanic to diagnose the problem. The technician will be able to identify the problem and repair it as necessary.
It's important to note that some of these steps may require special tools and knowledge of the vehicle's transmission system, so it's best to take it to a professional mechanic to avoid causing more damage.

If your vehicle with a Nitro engine is not upshifting and you're getting a P0750 code, it indicates that there is a problem with the shift solenoid "A". This solenoid is responsible for controlling the hydraulic pressure inside the transmission that helps to activate the clutches and bands that are responsible for shifting gears.
There are a few reasons why the shift solenoid "A" may not be functioning properly, which could lead to the transmission not upshifting. These reasons include:

1. Malfunctioning Shift Solenoid "A": The shift solenoid "A" could be faulty, stuck, or damaged, preventing it from functioning properly.
2. Wiring Issues: There could be issues with the wiring or connections leading to the shift solenoid "A," which could cause it to malfunction.
3. Low Transmission Fluid: If the transmission fluid is low or dirty, it could prevent the shift solenoid "A" from functioning properly, causing the transmission to not upshift.
4. Internal Transmission Problems: There could be internal problems within the transmission, such as a clogged valve body, damaged transmission bands, or worn clutches, which could cause the shift solenoid "A" to malfunction.

It is recommended to take your vehicle to a certified mechanic or dealership to diagnose and repair the issue, as transmission issues can be complex and require specialized knowledge and equipment to fix properly.

no info generic answer have vehicle scanned for trouble code[s]

transmission malfunction need to have the trouble code read to assist in cause of malfunction

code p0700 refers to transmission control system/ mil--malfunction===causes--wiring--TCM
check all wiring and connections to the transmission for water,corrosion etc
check/change the tcm ( transmission control module)

There is a good chance that your torque converter is locked due to a torque converter lock-up solenoid malfunction. (pretty common) The torque converter lock-up solenoid is what locks the torque converter to put the transmission into overdrive. When they malfunction, it will cause the transmission to be stuck in overdrive at all times (this is not supposed to happen until the vehicle speed gets over 45 Mph). You must remove the side cover from your transmission to replace the torque converter lock-up solenoid.
Please also be advised that many of the solenoid malfunctions - especially on older, high mileage vehicles, are caused by dirt and debris in the transmission. This debris is usually caused by wear or breakage of internal parts (like clutches or bearings) in the transmission. I would recommend also pulling the lower pan and filter off to see what kind of debris is in the pan and evaluate whether this may be caused by a more serious problem.

P0733 indicates which gear has a gear ratio that varies from the correct gear ratio, the corresponding in-gear trouble code ranges from DTCs P0731-36.

Without taking apart the transmission and inspecting for damage, it is difficult to say what the exact problem is, but many people who get the P0733 code have fixed the problem by replacing the accumulator in the transmission.

Other possible causes include:

• ATF level low
• Deteriorated ATF
• Shift solenoid B or F malfunction
• Pressure control solenoid malfunction
• Line pressure low
• Low clutch slipping
• High clutch slipping
• Control valve malfunction
• Oil pump malfunction
• TCM malfunction

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

P0700: Transmission Control Malfunction.

P0740 : Torque Converter Clutch Circuit Malfunction.

Looks like you have some transmission electronics problem.