As a car expert, I understand how frustrating it can be when your car starts acting up. One common issue that many car owners face is the P1103 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction. This problem can cause your car to skip gears, which can be dangerous and lead to further damage if not addressed promptly. In this article, I will provide you with a step-by-step guide on how to fix this issue and get your car back on the road.
Step 1: Check the Wiring
The first thing you should do when you encounter the P1103 error code is to check the wiring. This issue is often caused by a faulty wire or a loose connection. Start by inspecting the wiring harness that connects to the transmission control module. Look for any signs of damage, such as frayed wires or corrosion. If you find any issues, repair or replace the wiring as necessary.
Step 2: Check the Transmission Control Module
If the wiring looks good, the next step is to check the transmission control module (TCM). The TCM is responsible for controlling the transmission and can cause the P1103 error code if it is malfunctioning. To check the TCM, you will need a diagnostic scanner. Connect the scanner to the OBD-II port under the dashboard and follow the instructions to read the error codes. If the scanner shows a P1103 error code, the TCM is likely the culprit.
Step 3: Replace the TCM
If the TCM is the issue, you will need to replace it. The TCM is located under the dashboard on the driver’s side. To replace it, you will need to remove the old TCM and install the new one. Make sure to follow the manufacturer’s instructions carefully and double-check all connections before starting the car.
Step 4: Clear the Error Code
Once you have replaced the TCM, you will need to clear the error code. Use the diagnostic scanner to clear the code and reset the system. This will ensure that the car recognizes the new TCM and that the error code does not reappear.
Step 5: Test Drive
After you have cleared the error code, take your car for a test drive. Make sure to pay attention to how the car shifts gears and whether the P1103 error code reappears. If everything looks good, you have successfully fixed the issue!
The P1103 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction can be a frustrating issue to deal with, but with the right steps, you can fix it yourself. By checking the wiring, the TCM, and replacing the TCM if necessary, you can get your car back on the road in no time. Remember to clear the error code and test drive your car to ensure that the issue has been resolved.
1. Can I drive my car with the P1103 error code?
It is not recommended to drive your car with the P1103 error code. This issue can cause your car to skip gears, which can be dangerous and lead to further damage if not addressed promptly.
2. How much does it cost to replace the TCM?
The cost of replacing the TCM can vary depending on the make and model of your car. On average, you can expect to pay between $500 and $1,000 for parts and labor.
3. Can I fix the P1103 error code myself?
Yes, you can fix the P1103 error code yourself if you have the right tools and knowledge. By following the steps outlined in this article, you can diagnose and fix the issue without having to take your car to a mechanic.