Out of all the problematic OBD2 codes that could influence your car’s transmission system, the code P0703 probably isn’t the one you’d ever think could do much damage. Even if you are not familiar with the P0703 code meaning, you can guess by doing a little digging that it won’t directly affect the vital systems of the car.
Still, the consequences it leaves can be pretty worrying for car owners and our team wanted to help you figure things out regarding this code. So, we give you this guide with a complete overview of the crucial things to look out for when diagnosing, fixing, and preventing the code from ever happening again.
Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..
What does the P0703 code mean?
The P0703 code is a generic powertrain code that indicates a malfunction in the brake switch B circuit. This circuit is responsible for detecting when the brake pedal is pressed, allowing the transmission control module (TCM) to know when to shift gears. When the TCM detects a fault in the brake switch B circuit, it will trigger the P0703 code.
It is important for drivers to fix the P0703 code because it can cause a number of issues. For example, the vehicle may not shift gears properly, which can impact performance and fuel efficiency. Additionally, failing to address this issue can lead to more serious problems down the line.
What causes the P0703 code?
There are various possible causes of the code P0703, but only a few of these can directly trigger the code. It’s essential to also know how the consequences left by other issues could lead to the code, so here’s a complete breakdown of the most possible reasons behind it:
Faulty brake switch B circuit
When the brake pedal is depressed, the brake switch sends an electrical signal to the transmission control module to indicate that the brakes are engaged. If this signal is not received or is received incorrectly due to a fault in the brake switch or its wiring, it may cause the transmission control module to assume that the brakes are not engaged, even when they are.
This can lead to an incorrect torque converter clutch engagement, which can trigger the code P0703.
Wiring issues within the brake circuit
The wiring that connects the brake switch circuit to the transmission control module can become broken or damaged over time. This can cause intermittent connections and communication errors between the switch and the control module.
Faulty brake switch
The brake switch is an important component of a vehicle’s transmission system, as it sends a signal to the transmission control module when the brake pedal is pressed. This signal allows the transmission control module to engage or disengage the torque converter clutch at the appropriate times.
If the brake switch is faulty or not functioning properly, it may not send the correct signal to the transmission control module, therefore leading to the code P0703.
Which car models does the P0703 code affect the most?
Some particular vehicles are more prone to the P0703 code because of a known issue with the brake switch circuit. We decided to take things into our own hands by doing some digging on such vehicles to bring you the complete list:
- Honda Civic: Certain model years of the Honda Civic have been known to have issues with the torque converter clutch solenoid, which can cause the code P0703 to appear.
- Ford F-150: The Ford F150 has also been known to experience issues with the torque converter clutch solenoid, which can trigger the code P0703.
- Toyota Camry:: Certain model years of the Toyota Camry have reported issues with the torque converter clutch circuit, leading to the appearance of code P0703.
How to diagnose the P0703 code
Diagnosing the P0703 code requires a few steps. First, you will need to use a diagnostic tool to read the code and determine the specific fault. You may also need to inspect the brake switch circuit, wiring, and switch itself to identify any issues, but here’s a complete guide on steps to take:
Using a scanner tool
The first step in diagnosing any OBD-II code is to use a scan tool to read the code and any additional diagnostic trouble codes that may be present. This tool allows you to access important information about the vehicle’s transmission system, including sensor readings and transmission fluid pressure.
Check the brake switch
As we mentioned earlier, a faulty brake switch can lead to the code P0703. You will need to check the brake switch and its wiring to ensure that it is functioning properly.
Checking the torque converter clutch solenoid
The torque converter clutch solenoid is a common cause of code P0703. You can check this component to ensure that it is receiving power and functioning properly.
How to fix the P0703 code
Fixing the P0703 code will depend on the specific cause of the issue. The cost of these repairs will vary depending on the make and model of the vehicle and the specific repair needed, so let’s see what your main options are:
Replace the torque converter clutch solenoid
If a faulty torque converter clutch solenoid is identified as the cause of code P0703, it will need to be replaced. This involves removing the old solenoid and installing a new one.
Replace damaged wiring or connections
If the issue is caused by damaged wiring, the mechanic will need to locate and repair or replace the damaged wires. This may involve tracing the wiring back to its source and identifying any areas where it has been damaged.
Replace the brake switch
If a faulty brake switch is identified as the cause of code P0703, it will need to be replaced. This involves removing the old switch and installing a new one.
How to prevent the P0703 code
To prevent the P0703 code from appearing, it is important to properly maintain the brake switch circuit. Here’s what you can do to make sure that the problem doesn’t repeat anytime soon:
- Checking the brake switch wiring and connections
- Replacing any faulty components in the brake switch circuit
- Stick with the maintenance schedule
Additionally, it is important to follow the manufacturer’s recommended maintenance schedule to ensure that all systems are functioning properly.
Our take
Overall, the code P0703 can cause quite a mess if it affects the transmission’s shifting response and it may even make it more difficult for you to shift from the “park” into a moving gear. We, therefore, hope that this guide will shed some light on the problem and how you can fix it to ensure that your transmission keeps working properly.
What are the symptoms of code P0703?
Symptoms of code P0703 can include erratic shifting, reduced fuel efficiency, and poor acceleration. Some drivers may also notice that their transmission is slipping or that their vehicle is slower to shift gears than usual.
Can I continue driving if I have code P0703?
While it is possible to continue driving with code P0703, it is not recommended. This issue can cause damage to the transmission over time and may result in costly repairs if left unaddressed.
How is code P0703 diagnosed?
Code P0703 is typically diagnosed using a scan tool to read the code and any additional diagnostic trouble codes that may be present. Mechanics will also perform a visual inspection of the transmission system, check the brake switch and torque converter clutch solenoid, and may perform a test drive to identify any issues with shifting or torque converter engagement.
