OBD-II Code P0703 is defined as a Brake Switch “B” Circuit. This code indicates a malfunction in the brake switch system, which communicates with the vehicle’s Powertrain Control Module (PCM).
What Does the P0703 Code Mean?
The P0703 code signifies that there is an issue with the brake switch that tells the PCM when the brake pedal is depressed. This switch is also responsible for activating the brake lights. When the PCM receives an implausible signal from the brake switch, it triggers the P0703 code.
What Causes the P0703 Code?
Several issues can lead to the P0703 code, including:
- Brake switch failure
- Powertrain Control Module (PCM) failure
- Wiring issues affecting the brake switch circuit
What Are the Symptoms of the P0703 Code?
The symptoms associated with the P0703 code may include:
- Brake lights may not illuminate
- Cruise control will not operate
How Serious Is the P0703 Code?
The P0703 code is categorized as urgent. It indicates that immediate action is necessary, as neglecting this code can lead to significant malfunctions that may cause severe damage to the vehicle or pose safety risks to the driver and passengers.
How to Diagnose the P0703 Code
To diagnose the P0703 code, a mechanic will typically follow these steps:
- Use an OBD-II scanner to confirm the P0703 code and check for any additional codes.
- Inspect the brake switch and its wiring for damage or disconnections.
- Test the brake switch operation to ensure it is functioning correctly.
- Check the PCM to verify that it is receiving the correct signals from the brake switch.
Common Repairs for the P0703 Code
Repairs for the P0703 code may involve:
- Replacing the faulty brake switch
- Repairing or replacing damaged wiring or connectors
- Replacing the PCM if it is determined to be faulty
How Much Does It Cost to Fix the P0703 Code?
The cost to fix the P0703 code can vary based on the underlying issue. Generally, you can expect to pay:
- Brake switch replacement: $50 to $200
- Wiring repairs: $100 to $300
- PCM replacement: $300 to $1,000
Can I Fix the P0703 Code Myself?
While some experienced DIYers may be able to replace the brake switch or repair wiring, diagnosing and fixing the P0703 code can be complex. If you are not comfortable with automotive repairs, it is recommended to seek professional assistance to ensure the issue is resolved correctly.
