P0990 Technical Description
Transmission Fluid Pressure Sensor/Switch “E” Circuit Low
If you’re seeing the P0990 trouble code flash up on your dashboard, you’re likely eager to find out what it means and how to fix it.
This guide will cover the essentials: definition, symptoms, causes, and solutions.
Having fixed numerous vehicles with the P0990 code, I can confidently guide you through its resolution.
In this article, we’ll explore not just what the P0990 code signifies, but also the typical symptoms your car might exhibit, what could potentially cause this issue, and step-by-step fixes to resolve it.
Time to get our hands dirty. Let’s get started on fixing that trouble code!
Key Takeaways
- P0990 Defined: Transmission Fluid Pressure Sensor/Switch “E” Circuit Low.
- Symptoms: Includes delayed or unexpected gear shifting, and the vehicle entering limp mode.
- Common Causes: Low or contaminated transmission fluid, faulty pressure sensor, or wiring issues.
- Diagnostic Steps: Start with an OBD-II scanner, check the fluid levels, and inspect wiring.
- Fixing the Issue: Replace faulty components like the sensor or fluid, and possibly the transmission control module if needed.
- Post-Repair: Always clear the code with a scanner and conduct a test drive to ensure the issue is resolved.
Table of ContentsShow
What Does P0990 Trouble Code Mean?
Ah, the P0990 trouble code – sounds like your car’s way of saying, “Let’s talk about our transmission fluid pressure relationship.”
This code points to an issue where the signal from the transmission fluid pressure sensor is reading out of range for what the control module expects.
In plain speak, your car is either not feeling the pressure where it should, or it’s feeling too much of it.
This sensor is crucial because it helps regulate how your transmission shifts gears, keeping everything smooth and efficient under the hood.
When this sensor’s data doesn’t match up with the car’s brain’s expectations, it calls for a time-out to figure out what’s going on, hence the P0990 code.
Now, why should you care?
Well, if left unchecked, this could lead to less-than-pleasant driving experiences.
We’re talking about gear shifts that feel as smooth as a square wheel or, at worst, a transmission that decides it’s not playing ball at all. Neither scenario is great for your car’s health or your wallet.
Before you panic, remember this code is your car’s way of whispering for help rather than yelling in despair.
With some timely intervention – think checking fluid levels, inspecting for leaks, or consulting a pro for a deeper dive – you can often avoid the drama of a major transmission repair.
So, take it seriously, but don’t let it drive you up the wall. Your car’s just asking for a little attention to keep you both cruising smoothly.
P0990 Trouble Code Symptoms
When your vehicle exhibits the P0990 trouble code, you might notice several performance issues. Here’s a list of common symptoms:
- Delayed gear shifting
- Unexpected gear shifts
- Lower fuel efficiency
- Transmission slipping
- Check engine light is on
- Vehicle enters limp mode
P0990 Trouble Code Causes
The P0990 trouble code can be triggered by a variety of issues related to the transmission fluid pressure. Common causes include:
- Faulty transmission fluid pressure sensor
- Low transmission fluid level
- Dirty or contaminated transmission fluid
- Malfunctioning transmission control module
- Damaged wiring or connectors in the pressure sensor circuit
How To Fix A P0990 Trouble Code
Addressing a P0990 trouble code requires a methodical approach to diagnose and resolve the underlying issues with the transmission fluid pressure system. Here’s a step-by-step guide to help you fix this error:
1. Use an OBD-II Scanner
Connect a scanner to retrieve the P0990 code and any other related diagnostic trouble codes. This initial scan is crucial for understanding the broader context of the transmission issues.
2. Check for Additional Codes
Identifying accompanying codes can help pinpoint more complex problems affecting the transmission system.
3. Transmission Fluid Level and Condition
Ensure the fluid level is adequate and the fluid isn’t burnt or contaminated. Low or poor-quality fluid can trigger pressure issues.
4. Wiring and Connections
Examine the electrical connections to the transmission fluid pressure sensor. Look for loose, damaged, or corroded wires and connectors and repair or replace as necessary.
5. Test the Pressure Sensor
If the wiring is intact, test the transmission fluid pressure sensor itself with a multimeter to ensure it is functioning properly. Refer to the vehicle’s service manual for the correct resistance and voltage readings.
6. Replace if Necessary
If the sensor fails the tests, replace it with a manufacturer-approved part.
7. Reset the Trouble Code
After the repairs, use the OBD-II scanner to clear the P0990 code from the car’s computer system.
8. Road Test
Drive the vehicle to see if the issue reoccurs. This test helps confirm that the problem is resolved and the repair was successful.
By following these steps, you can diagnose and remedy the issues associated with the P0990 trouble code, ensuring your vehicle’s transmission operates smoothly and efficiently.
Conclusion
Now that you’re equipped with knowledge about the P0990 trouble code, its symptoms, causes, and repair solutions, you’re well on your way to fixing your vehicle efficiently.
Have you encountered this issue before? What was your fix?
Feel free to share your experience in the comments. Let’s help each other out!
