The Engine Fault Code P0990 refers to an issue with the Transmission Fluid Pressure Sensor or Switch E. This code indicates that there`s a problem with the electrical circuit of this sensor, specifically that the voltage is too high. Its important to note that this code can have slightly different meanings depending on the vehicle manufacturer.
General Meaning:
– P0990: Transmission Fluid Pressure Sensor/Switch E Circuit High
Possible Causes:
1. Faulty Transmission Fluid Pressure Sensor
2. Short circuit in the wiring or connector
3. Open circuit in the wiring
4. Faulty Transmission Control Module (TCM)
5. Low transmission fluid levels
Manufacturer-Specific Meanings:
1. Porsche: Similar to the general definition, it often relates to issues in the transmission system, potentially affecting shifting performance.
2. Mini: May indicate a problem with the automatic transmission, affecting gear changes and overall driving experience.
3. Mercedes: Could suggest a malfunction in the transmission management system, which might lead to rough shifting or limp mode.
4. Audi: Often points to issues with the transmission fluid pressure, which can impact the vehicle`s ability to shift gears correctly.
5. Jaguar: Might indicate a need for service or replacement of the transmission pressure sensor, affecting overall transmission performance.
6. Land Rover: Similar to Jaguar, it can signal issues in the transmission system, possibly leading to reduced performance or increased wear.
What to Do:
If you see this code, it`s best to:
– Check the transmission fluid level and condition.
– Inspect the wiring and connectors for damage or corrosion.
– Test the transmission fluid pressure sensor.
– Use a diagnostic tool to clear the code and see if it returns after a test drive.
Getting this checked by a professional is recommended to avoid further damage to the transmission system.
The Engine Fault Code P0990 indicates a problem with the Transmission Fluid Pressure Sensor/Switch E Circuit, specifically that the circuit is reading high. This code can be triggered by several factors, and while the general causes are similar across different manufacturers, there can be some variations. Here are the main causes:
1. Faulty Transmission Fluid Pressure Sensor: The sensor itself may be defective, causing it to send incorrect readings to the engine control unit (ECU).
2. Wiring Issues: Damaged, frayed, or corroded wiring in the circuit can lead to incorrect signals being sent. This includes issues with connectors that might not be making a proper connection.
3. Transmission Fluid Issues: Low or dirty transmission fluid can affect the sensor`s performance. If the fluid is low, it can lead to incorrect pressure readings.
4. Faulty ECU: In rare cases, the engine control unit itself may have a fault, leading to incorrect interpretation of the sensor`s data.
5. Mechanical Problems in the Transmission: Issues such as a stuck valve or other internal problems can affect fluid pressure, which may trigger the code.
Manufacturer-Specific Considerations:
– Porsche: The issue might also relate to the specific type of transmission used in models like the 911 or Cayenne, where the sensor`s calibration could differ.
– Mini: Some Mini models may have unique wiring harness configurations that can lead to issues if not properly secured or if they experience wear.
– Mercedes: Mercedes vehicles often have more complex transmission systems, so it`s important to check for software updates or recalls that might address sensor issues.
– Audi: Audi vehicles might require a specific diagnostic tool to read the transmission system accurately, as their systems can be more intricate.
– Jaguar: Jaguar models might have unique transmission types (like ZF) that can affect the way sensors operate, so checking for manufacturer-specific service bulletins can be helpful.
– Land Rover: Similar to Jaguar, Land Rover`s advanced transmission systems might have specific quirks, and it`s wise to look for any known issues with the model in question.
When diagnosing the P0990 code, it`s essential to check the sensor, wiring, and fluid condition first. If these are all in good shape, further investigation into the transmission and ECU may be necessary.
The engine fault code P0990 indicates a problem with the transmission fluid pressure sensor or switch circuit, specifically that the circuit is reading too high. This can happen in various European cars like Porsche, Mini, Mercedes, Audi, Jaguar, and Land Rover. Heres how to troubleshoot and fix the issue:
General Steps to Fix P0990:
1. Check the Wiring and Connections:
– Inspect the wiring harness connected to the transmission fluid pressure sensor. Look for any damaged, frayed, or corroded wires.
– Ensure that all connectors are securely attached and free from dirt or moisture.
2. Test the Sensor:
– Use a multimeter to check the resistance of the transmission fluid pressure sensor. Compare your readings with the manufacturers specifications.
– If the sensor is out of spec, replace it.
3. Inspect the Transmission Fluid:
– Low or dirty transmission fluid can cause pressure issues. Check the fluid level and condition.
– If its low, top it off with the correct type of fluid. If its dirty, consider a transmission fluid change.
4. Check for Other Codes:
– Use an OBD-II scanner to check for any other related codes. Sometimes, multiple codes can indicate a bigger issue.
5. Clear the Codes:
– After making repairs, clear the codes using an OBD-II scanner and take the car for a test drive to see if the code returns.
Manufacturer-Specific Notes:
– Porsche:
– Porsche vehicles may have specific sensor locations and wiring diagrams. Refer to the service manual for precise details.
– Mini:
– In Mini models, check for software updates for the transmission control module. Sometimes, a software glitch can cause false readings.
– Mercedes:
– Mercedes may require a special tool to reset the transmission control module after replacing the sensor. Check the service manual for procedures.
– Audi:
– Audi vehicles might have a more complex transmission system. If basic fixes dont work, it may be necessary to check for internal transmission issues.
– Jaguar:
– On Jaguars, ensure that the transmission fluid is at the correct temperature before checking levels, as this can affect readings.
– Land Rover:
– For Land Rover models, check for specific technical service bulletins (TSBs) related to P0990, as there might be known issues or fixes.
If youve gone through these steps and still have the P0990 code, it may be time to consult a professional mechanic. They can perform more in-depth diagnostics and ensure that the issue is resolved correctly.
Driving with a P0990 code, which indicates a problem with the Transmission Fluid Pressure Sensor/Switch E Circuit being high, is generally not safe. This code suggests that the transmission fluid pressure sensor is sending a signal that is higher than expected. Heres how it can affect different manufacturers:
1. Porsche: In Porsches, this code can lead to erratic shifting or even transmission failure if not addressed. It`s best to limit driving and get it checked soon.
2. Mini: For Minis, a high-pressure signal could mean the transmission is overheating or that there`s a fluid leak. Driving could cause more damage, so its advisable to stop driving and get it diagnosed.
3. Mercedes: In Mercedes vehicles, this issue can lead to harsh shifting or slipping. Its recommended to avoid driving until the problem is resolved to prevent further damage.
4. Audi: Audis might experience similar symptoms, like poor shifting performance. Continuing to drive can cause the transmission to fail, so its best to get it checked.
5. Jaguar: For Jaguars, this code can indicate potential transmission issues. Driving could worsen the problem, so it`s wise to have it inspected.
6. Land Rover: In Land Rovers, a high-pressure reading can lead to transmission overheating. It`s best not to drive until a mechanic can take a look.
Our take, while it might be possible to drive short distances with a P0990 code, it`s not advisable. Each manufacturer may have different symptoms and risks associated with this code, but the general consensus is to get it diagnosed and repaired as soon as possible.
