Common Porsche Transmission Problems
Older Porsches with a 5-speed Tiptronic transmission can have an intermittent issue that will manifest as delayed and harsh gear changes in the initial phases. This problem worsens with time, ending with transmission going into a limp-home mode. Usually, the problem will be more noticeable when the vehicle warms up. In most cases, this will check the engine light, so a corresponding error code will be stored.
Possible causes and solutions:
- A cracked or damaged conductor plate is a carrier and linkage between solenoids and the TCU. Any faults within this plate will result in communication problems, which will cause improper solenoid operation. This is a well-known problem, and there are numerous aftermarket solutions.
No 5th gear in automatic mode
Many older Porsches with a 5-speed Tiptronic transmission can develop a very specific symptom that may seem intermittent. The transmission may seem to work flawlessly but will not upshift to 5th gear in automatic mode. It will perform this gear change without any apparent problems when in manual mode. There will be no other symptoms or transmission-related warnings.Possible causes and solutions:
- Underinflated tires or tires set the transmission into a mode that doesn’t shift into 5th gear. This safety feature is meant to remind the driver to check the tire pressure and has nothing to do with the transmission itself. Setting the tire pressure to the correct level solves the issue.
Some Porsches that use a 5-speed Tiptronic transmission can suffer from shift flares that can occur on acceleration or while downshifting under load. While most vehicles only exhibit mild symptoms, it is possible for flares to become too severe and send the transmission into limp-home mode. The problem is usually intermittent and comes without any other symptoms.Possible causes and solutions:
- Worn bores inside the valve body cause leakage and sporadic pressure loss. This type of transmission relies on correct transmission fluid pressure, this will cause delays and flares when shifting. This is a known issue, and there are several upgraded aftermarket kits that can solve it.
Harsh and delayed gearshifts
With a 6-speed automatic gearbox designated as TR-60SN, Porsche Cayennes can suffer from harsh upshifts during acceleration or delayed downshifts that appear only when coming to a stop. In the initial phases, this issue will manifest only while the vehicle is cold and on mild accelerations but worsens with time. In most cases, there will be no other symptoms.Possible causes and solutions:
- Worn bores inside the valve body, with a solenoid modulator or clutch control valve, are most commonly affected. Instead of replacing the valve body, installing upgraded valve kits for these locations, which are available as aftermarket parts is better.
Difficult or impossible gear engagement
Porsche Boxsters and Caymans with a 6-speed manual transmission can have issues when selecting certain gears. This can manifest as a difficult gear engagement, with the driver having to repeat the procedure several times until it succeeds. In worse cases, the transmission will remain stuck in one gear and will not react to driver inputs.Possible causes and solutions
- Worn bushings under the shift lever, causing a misalignment that results in difficult gear changes. In most cases, this affects reverse gears more than forwarding ones. Renewing the bushings and performing a cable adjustment afterward solve the issue.
- Broken or disconnected shifter cables cause an instant loss of ability to shift gears. The car will remain in its gear before this happens while the shift lever moves freely around.
Many newer Porsche cars and SUVs use the 7-speed PDK transmission, which has problems. However, based on our experience and research, there are limited repair experts for PDK transmission. Also, Porsche doesn’t sell spare parts for this transmission, nor does it allow their dealerships to repair them. Therefore the majority of problems in this list affect Porsche vehicles with Tiptronic transmission.
If you are a Porsche owner experiencing problems with the automatic transmission, we strongly recommend checking the transmission fluid level first. Low transmission fluid is a common problem with Porsche transmission, which causes several symptoms, including transmission slipping, hard shifting, limp mode, transmission not going in gear, etc. If the transmission fluid is not the issue, read the fault codes from the transmission control unit (TCU) with a Porsche scanner.The YOUCANIC Full System Scanner can read and clear fault codes through every vehicle’s control module. We hope you find the Most Common Peugeot Transmission Problems guide helpful. Check these troubleshooting and repair guides for more help on your Peugeot.