Fixing Audi Gearbox Malfunction - Common Transmission Problems - YOUCANIC (2024)

To many people, Audi represents a high-quality vehicle that contains some of the most advanced technology and features. Unfortunately, like any other complicated system, you may experience some failures with your Audi’s transmission (also known as the gearbox). This can negatively impact how your Audi drives. Common bad transmission symptoms in Audi are slipping gears, delayed engagement, and harsh shifting. You need a professional scanner to conduct a complete system diagnostic scan to pinpoint what’s happening. Only then can you make sure it gets the proper repairs.

Audi automatic transmission problems could be as simple as your low transmission level. Still, it could also be a defective valve body, bad tranny control module, shifter module, tranny fluid pump, worn clutches, and/or electronic problems.

Symptoms

Common problems with Audi automatic transmissions:

• Transmission won’t shift.
• Transmission is stuck in limp mode.
• Transmission bangs into gear
• Tiptronic, not engaging
• Audi won’t go in reverse.
• Won’t shift out of the park
• Stuck in limp mode
• Won’t go into gear
• It goes in gear and won’t move.

Common Problems

Shifting issues, such as slippage or rough or delayed shifting, are the most common complaints associated with Audi gearboxes. Other common problems include the transmission control module or the malfunction indicator light turning on due to low fluid levels or a transmission malfunction. Clutch wear, lurching, or wearing out of the torque converter are common issues that can be treated with routine maintenance and fluid changes. On occasion, a complete replacement transmission will be necessary.

1. Mechatronic unit failure is a common dual-clutch (S-tronic) transmission issue. It is caused by electronic faults in the mechatronic unit, which can result in loss of transmission function and gear selection.
2. Solenoid valve issues: Solenoid valves control gear changes, and their failure can cause transmission slipping, gear shifting problems, or the transmission going into limp mode.
3. Clutch wear: A worn clutch can cause slipping, vibration, and difficulty shifting gears. This issue is more common in older cars with high mileage.
4. Software errors: Software errors can cause gearbox malfunctions, such as shifting problems, gearbox control unit failure, and transmission control module malfunction.
5. Wiring issues: Wiring problems can result in transmission slipping, failure of gear selection, or the transmission going into limp mode.

These are the most common issues that can cause a gearbox malfunction in an Audi. An ASE-certified mechanic would be able to diagnose and repair these problems.

DSG Transmission Problems Explained

The Audi DSG, a type of automated manual transmission, is a dual-clutch transmission produced by the Volkswagen Group. Two internal clutches control odd- and even-numbered gearsets, enabling sequential gearshifts without disruption of drive torque to the wheels. Control over which clutch to engage and the time to switch gears is carried out by a transmission control unit (TCU), which can coordinate multiple gear changes in just a few hundred milliseconds.

The end result provides better acceleration, fuel economy, and shift feel than a traditional manual or a torque converter automatic. DSG-equipped Audi models are high-performance vehicles that require specialized diagnostic tools and technical knowledge to service and repair properly.

Transmission Problems by Symptoms

Judder and loud bang when going from neutral to gear

For instance, some mid-2000s Audi models with the Tiptronic transaxle can exhibit this judder while shifting from Neutral into Reverse or Drive, complete with a loud thumping sound. This combination of symptoms will almost certainly trigger a P0706 trouble code, and the check engine light will be illuminated.

Possible causes

• The connector for the transmission range sensor was not adequately sealed, allowing water and dirt to enter. This causes corrosion and distorts signals. Cleanoff any traces of corrosion and ensure that the connector is sealed.
• The transmission range sensor may have an internal fault. It is not serviceable, so replacing it is the only option. It is located underneath the car, at the driver’s side of the gearbox.

Clutch slip and RPM oscillations in 4th and 5th gear

When cruising on highway speeds in 4th or 5th gear, Audi cars with Tiptronic transmission can experience something similar to clutch slippage. The engine speed will go up and down by several 100 RPMs. In most cases, the check engine light will go on, and there will be a P0741 code stored.

Possible causes

• If you have a damaged torque converter, clutch solenoid valve, wiring, or connector, check all wiring and repair it if needed.
• If the torque converter clutch solenoid valve is faulty or clogged, test its operation with a diagnostic tool and replace it if necessary.
• Worn-out torque converter clutch.

Grinding or rattling noise while driving

Audi cars with a Tiptronic transmission can suffer from a grinding noise that may be present when the car is in ‘drive.’ This may happen when it is cold and may go away as it warms up or can always be present. The frequency of the noise follows the engine speed.

Possible causes

• A torque converter has several needle bearings inside, which can wear out or be damaged due to poor maintenance. In addition to noise, this can create noticeable vibrations during accelerations.
• Check the transmission fluid level and top it off if needed. If you don’t know when it was changed last time, consider replacing it with a filter.

PRNDS symbol occasionally flashing, the car will not engage any gear

Many cars with Audi Multitronic transmissions can experience many unusual issues. As this is a continuously variable transmission, it uses a specific internal architecture, and symptoms can have different meanings. Often, there will be a flashing PRNDS symbol on the dashboard. In some cases, the transmission will refuse to engage any gear. Restarting the car can sometimes solve the issue.

Possible causes

• There may be a low transmission fluid level, degraded fluid, or a clogged oil filter. Check the fluid condition and replace it if necessary.
• Faulty transmission oil pump(s)resulting in insufficient oil pressure. Check the oil pressure using a specialized diagnostic tool and replace it if needed.
• Faulty Transmission Control Unit (TCU). This is a reasonably common issue, and many specialized workshops can repair it.

Hesitation when setting off and hunting during acceleration

Many Audi cars with Multitronic transmissions made up to 2005 suffer from a lack of response, either when sitting from a standstill or trying to accelerate. A feeling of gear-hunting and slippage accompanies this. In the initial phases, the problem will be present only when driving more aggressively.

Possible causes

• In some cases, the lack of response can be caused by inadequate TCU software. Try updating the software or carrying out the relearn procedure described below.
• The most common cause of this problem is worn clutch packs. Over time, clutch discs wear out, resulting in metal shavings within the oil filter. Replacing the clutch pack is the only solution. Because this is such a widespread problem, various aftermarket upgraded kits increase longevity.

Transmission Malfunction, No Reverse, You can continue driving.

Here are a few potential causes of Audi transmission malfunction with no reverse:

• Failed reverse gear: The reverse gear in the transmission may have physically failed, making it impossible to engage the reverse.
• Solenoid failure: The solenoid responsible for engaging reverse may have failed, preventing the transmission from shifting into reverse.
• Transmission control module issue: The module responsible for controlling the transmission may have failed, causing reverse gear failure.
• Transmission fluid issue: If the fluid is contaminated or low, it can cause various transmission problems, including reverse gear failure.
• Mechanical wear and tear: Over time, mechanical wear and tear can cause various components within the transmission to fail, including the reverse gear.

A mechanic would need to diagnose the specific cause of the malfunction through a thorough inspection of the transmission and its components.

DSG transmission going into limp mode

DSG transmission in Audi cars is a complex component that can go into limp mode. During this, it will be stuck in third gear, and the ‘PRNDS’ symbol on the dashboard will flash. When this happens, there will be a stored code that will help track the problem.

Possible causes

• If codes mention ‘clutch limits’ or ‘clutch adaptation,’ your clutch may be worn. However, before replacing it, you may try resetting the gearbox. This can be done using an Audi diagnostic tool or the procedure described below.
• Various sensor failures, such as temperature sensors. Check the suspected sensor and replace it if needed.
• Mechatronic unit failure. This will usually trigger multiple codes, including sensors and implausible gear ratios. Mechatronic units are not serviceable and can be replaced or repaired by a specialist.

Reset Transmission Adaptation

1. Turn on the ignition, but don’t start the engine.
2. Press the accelerator and keep it pressed for 10 seconds
3. Turn off the ignition.
4. Release the accelerator
5. Remove the key from the ignition.
6. Press the accelerator and keep it pressedfor 10 seconds
7. Release the accelerator
8. Turn on the ignition and start the engine.

Check the Transmission Fluid Level

Low transmission fluid level is one of the most common Audi transmission problems, resulting in no-shift, delayed shifts, erratic shifts, and shifting at high RPMs. If your Audi started showing signs of automatic transmission problems, such as shifting erratically or not smoothly, a probable cause is the transmission fluid level being low.

To check the transmission fluid level on an Audi transmission, follow these steps:

1. Ensure the car is on level ground and the engine is running.
2. Locate the transmission dipstick, usually near the front of the engine bay.
3. Pull the dipstick out and wipe it clean with a cloth.
4. Reinsert the dipstick and remove it again to check the fluid level.
5. The fluid level should be between the minimum and maximum markings on the dipstick.
6. If the fluid level is low, add the specified fluid type through the dipstick tube, ensuring not to overfill.
7. Repeat steps 3-5 to verify that the fluid level is acceptable.

Note: Using the correct fluid type for your specific Audi model and transmission type is essential, as specified in the owner’s manual or by a qualified Audi technician. It is also recommended that the fluid level be checked with the transmission at operating temperature.

Recalls / TSB

Several technical service bulletins (TSBs) and recalls have been issued for Audi transmissions, especially for automatic transmission shifting, DSG failures, and transmission power outages. Contact Audi’s official website or your local dealership for the best description and information regarding the recalls or TSBs that pertain to your vehicle’s year, make, and model.

Read Transmission Fault Codes

The next step in the troubleshooting process is to read the fault codes from the Transmission Control Module. These are manufacturer-specific codes and can not be read with a generic OBD-II scanner. For this step, you will need an Audi VW Transmission Scanner.

Reaching and clearing codes from the Audi transmission module is very simple.

1. Locate the OBD-II port under the dashboard and connect your scanner.
2. Turn on the ignition, but do not start the engine.
3. Select Audi from the main menu and model.
4. Scroll down to Control Units.
5. Select Drivetrain, then Transmission.
6. Select Read Fault Codes.