P1938 Mazda Code - Brake Switch/Sensor Signal
Quick Answer
P1938 Mazda indicates Brake Switch/Sensor Signal. Common causes include Faulty Brake Switch/Sensor, Brake Switch/Sensor harness is open or shorted, Brake Switch/Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1938 Mazda indicates Brake Switch/Sensor Signal.
- Common causes
- Common causes include Faulty Brake Switch/Sensor, Brake Switch/Sensor harness is open or shorted, Brake Switch/Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1938 Mazda Description
What are the Possible Causes of the DTC P1938 Mazda?
- Faulty Brake Switch/Sensor
- Brake Switch/Sensor harness is open or shorted
- Brake Switch/Sensor circuit poor electrical connection
How to Fix the DTC P1938 Mazda?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1938 Mazda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1938 Mazda Code
1. What are the common symptoms of OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal?
- Common symptoms include issues with the brake lights, cruise control not working, and the inability to shift out of park.
2. What are the possible causes of OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal?
- Possible causes include a faulty brake light switch, damaged wiring or connectors, or a malfunctioning brake pedal position sensor.
3. How can I diagnose the OBDII code P1938 in my Mazda related to the Brake Switch/Sensor Signal?
- You can use a diagnostic scanner to read the code, check the brake light operation, inspect the brake switch and sensor, and test the wiring for continuity.
4. Can I continue driving my Mazda with OBDII code P1938 related to the Brake Switch/Sensor Signal?
- It is not recommended to drive your vehicle with this code as it can affect important safety features like brake lights and shift interlock system.
5. What are the repair options for fixing OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal?
- Repair options may include replacing the brake light switch, repairing damaged wiring, or recalibrating the brake pedal position sensor.
6. How much does it typically cost to repair OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal?
- The cost of repair can vary depending on the specific issue, but it may range from $50 to $200 for parts and labor.
7. Are there any DIY tips for troubleshooting OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal?
- You can start by checking the brake light switch adjustment, inspecting the wiring for damage, and testing the brake pedal position sensor with a multimeter.
8. Will resetting the OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal make it go away permanently?
- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear.
9. Can a malfunctioning brake switch or sensor cause other problems in a Mazda besides triggering OBDII code P1938?
- Yes, a faulty brake switch or sensor can also lead to issues like intermittent brake lights, cruise control malfunctions, and problems with the transmission shift interlock system.
10. Is it necessary to visit a dealership or mechanic to diagnose and repair OBDII code P1938 in a Mazda related to the Brake Switch/Sensor Signal?
- While professional help is recommended for accurate diagnosis and repair, some DIY enthusiasts with the right tools and knowledge may be able to address the issue themselves.
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