As a car expert, I understand how frustrating it can be when your car starts acting up. One of the most common issues that car owners face is transmission failure. In this article, I will provide you with a step-by-step guide on how to fix P1790 Transmission Mechanical Failure – First and Second.
What is P1790 Transmission Mechanical Failure – First and Second?
P1790 is a diagnostic trouble code that indicates a mechanical failure in the transmission’s first and second gears. This code is usually triggered when the transmission control module (TCM) detects a problem with the transmission’s mechanical components.
Step-by-Step Guide to Fix P1790 Transmission Mechanical Failure – First and Second
Step 1: Check the Transmission Fluid Level
The first thing you should do when you encounter a transmission problem is to check the fluid level. Low transmission fluid can cause a variety of issues, including P1790. To check the fluid level, locate the transmission dipstick under the hood of your car. Pull it out and wipe it clean with a rag. Reinsert the dipstick and pull it out again to check the fluid level. If the fluid level is low, add more until it reaches the appropriate level.
Step 2: Inspect the Transmission Pan
The transmission pan is located underneath the car and houses the transmission filter and fluid. Over time, the pan can become damaged or corroded, leading to leaks and other issues. Inspect the pan for any signs of damage or leaks. If you notice any issues, replace the pan.
Step 3: Check the Transmission Filter
The transmission filter is responsible for removing contaminants from the transmission fluid. Over time, the filter can become clogged, leading to transmission problems. Inspect the filter for any signs of damage or clogs. If you notice any issues, replace the filter.
Step 4: Inspect the Transmission Solenoids
The transmission solenoids are responsible for controlling the flow of transmission fluid. If the solenoids become damaged or fail, it can cause P1790. Inspect the solenoids for any signs of damage or wear. If you notice any issues, replace the solenoids.
Step 5: Check the Wiring and Connectors
The wiring and connectors that connect the transmission to the TCM can become damaged or corroded over time. Inspect the wiring and connectors for any signs of damage or wear. If you notice any issues, repair or replace the wiring and connectors.
Step 6: Reset the Transmission Control Module
After you have completed all of the above steps, reset the TCM. This will clear any stored codes and allow the TCM to relearn the transmission’s settings. To reset the TCM, disconnect the battery for at least 30 minutes. Reconnect the battery and start the car.
Fixing P1790 Transmission Mechanical Failure – First and Second can be a daunting task, but by following the above steps, you can diagnose and fix the issue. Remember to always check the fluid level, inspect the transmission pan and filter, check the solenoids, inspect the wiring and connectors, and reset the TCM. By doing so, you can ensure that your car is running smoothly and avoid costly repairs in the future.
1. Can I drive my car with P1790 Transmission Mechanical Failure – First and Second?
It is not recommended to drive your car with P1790 as it can cause further damage to the transmission. It is best to diagnose and fix the issue as soon as possible.
2. How much does it cost to fix P1790 Transmission Mechanical Failure – First and Second?
The cost of fixing P1790 can vary depending on the severity of the issue and the make and model of your car. It is best to consult with a mechanic for an accurate estimate.
3. How can I prevent P1790 Transmission Mechanical Failure – First and Second?
Regular maintenance, such as changing the transmission fluid and filter, can help prevent transmission issues like P1790. It is also important to address any transmission problems as soon as they arise to avoid further damage.