P1938 Mercury Code - Brake Switch/Sensor Signal
Quick Answer
P1938 Mercury 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 Mercury 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 Mercury Description
What are the Possible Causes of the DTC P1938 Mercury?
- 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 Mercury?
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 Mercury 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 Mercury Code
1. What does the OBDII code P1938 mean on a Mercury vehicle?
P1938 indicates an issue with the brake switch or sensor signal in the vehicle, which can affect the brake light operation and potentially the shift interlock system.
2. What are the common symptoms of code P1938 in a Mercury?
Symptoms may include non-functional brake lights, the inability to shift from park, or a warning light on the dashboard.
3. What causes the P1938 code to appear?
The most common causes are a faulty brake light switch, damaged wiring or connectors in the brake switch circuit, or a malfunctioning brake pedal position sensor.
4. Can I drive my Mercury with the P1938 code active?
Driving with this code is possible but not recommended, as it may cause safety issues like non-functioning brake lights or difficulties shifting out of park.
5. How do I diagnose the P1938 code on my Mercury?
Start by checking the brake lights for proper operation, inspecting the brake switch and its wiring for damage, and using a multimeter to test the brake switch's functionality.
6. How do I fix the P1938 code on a Mercury?
Repairs may involve replacing a faulty brake light switch, repairing damaged wiring, or recalibrating or replacing the brake pedal position sensor.
7. Is the P1938 code specific to Mercury vehicles?
While the code can appear on other makes, the specifics of the issue and repair process may vary depending on the Mercury model and year.
8. How much does it cost to fix the P1938 code on a Mercury?
Repair costs can range from $50 to $200, depending on whether the brake switch or sensor needs replacement or if wiring repairs are required.
9. Can the P1938 code trigger other issues in my Mercury?
Yes, it can affect systems like the cruise control, shift interlock, and anti-lock braking system (ABS), depending on the severity of the brake switch or sensor failure.
10. Will clearing the P1938 code fix the problem permanently?
Clearing the code without addressing the root cause will not resolve the issue, and the code is likely to return. Proper diagnosis and repair are essential.
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