The P1935 trouble code is an OBD-II diagnostic code that indicates a specific issue within the vehicle’s powertrain system. This code can vary in meaning depending on the manufacturer, but it generally relates to a malfunction in the brake switch/sensor signal or other components affecting engine performance. Understanding this code is crucial for vehicle owners and DIY mechanics, as it can lead to significant performance issues if not addressed promptly.
| P1935 Code Meaning | P1935 Code Common Causes |
|---|---|
| Brake switch/sensor signal malfunction | Faulty brake switch or sensor |
| Engine oil temperature sensor malfunction | Wiring issues or damaged connectors |
| Fuel additive level low (for some models) | Low fuel additive level or faulty sensor |
| Crankshaft position sensor circuit malfunction | Defective crankshaft position sensor or wiring issues |
| Injector circuit malfunction | Dirty fuel injectors or faulty fuel pump |
Symptoms of P1935 Code
When the P1935 code is triggered, drivers may notice several symptoms that indicate an underlying problem. Common symptoms include:
- Check Engine Light: The most immediate sign is the illumination of the check engine light on the dashboard.
- Engine Performance Issues: Drivers may experience stalling, misfiring, or reduced power while driving.
- Starting Problems: In some cases, the vehicle may have difficulty starting or may not start at all.
- Increased Emissions: If the issue relates to fuel additives, there may be an increase in exhaust emissions.
Technical Explanation of P1935 Code
The P1935 code is part of the OBD-II system, which monitors various components of the vehicle’s engine and transmission systems. Each vehicle manufacturer may have specific definitions for this code, but it generally indicates a fault related to the brake switch/sensor signal. This switch is crucial for ensuring that the vehicle’s braking system operates correctly and communicates with other systems, such as traction control and stability control.
Step-by-Step Diagnosis
- Initial Scan: Use an OBD-II scanner to confirm the presence of DTC P1935 and check for any additional codes that may provide further insight into the problem.
- Visual Inspection: Inspect the wiring and connectors associated with the brake switch and other relevant sensors for any visible damage or disconnections.
- Test Brake Switch: Check the functionality of the brake switch using a multimeter to ensure it operates correctly when the brake pedal is pressed.
- Check Related Sensors: If applicable, inspect other sensors mentioned in conjunction with this code, such as the engine oil temperature sensor and fuel additive level sensor.
- Clear Codes and Test Drive: After performing any repairs, clear the codes and take the vehicle for a test drive to see if the issue reoccurs.
Solution Methods
Brake Switch/Sensor Malfunction
- Symptoms: Check engine light illuminated; potential stalling; braking system issues.
- Diagnosis Steps:
- Inspect wiring for damage.
- Test brake switch operation with a multimeter.
- Solution:
- Replace faulty brake switch or repair damaged wiring.
- Cost Estimates:
- Brake switch replacement typically costs between $50-$150 including parts and labor.
- Warnings and Recommendations:
- Ensure all electrical connections are secure to prevent future issues.
Engine Oil Temperature Sensor Malfunction
- Symptoms: Engine performance issues; check engine light on.
- Diagnosis Steps:
- Check sensor wiring for shorts or breaks.
- Test sensor output against specifications.
- Solution:
- Replace faulty oil temperature sensor.
- Cost Estimates:
- Replacement costs can range from $100-$200 depending on labor rates.
- Warnings and Recommendations:
- Monitor engine temperature closely after repair to avoid overheating.
Fuel Additive Level Low
- Symptoms: Check engine light; reduced engine performance; increased emissions.
- Diagnosis Steps:
- Inspect fuel additive tank for leaks.
- Test fuel additive level sensor functionality.
- Solution:
- Refill fuel additive tank; replace faulty sensor if necessary.
- Cost Estimates:
- Refilling additives is generally inexpensive; sensor replacement may cost $100-$200.
- Warnings and Recommendations:
- Regularly check fuel additive levels to prevent recurrence of this issue.
Crankshaft Position Sensor Circuit Malfunction
- Symptoms: Engine stalling; misfiring; no start condition.
- Diagnosis Steps:
- Inspect wiring harnesses connected to the crankshaft position sensor.
- Test crankshaft position sensor output.
- Solution:
- Replace faulty crankshaft position sensor or repair wiring issues.
- Cost Estimates:
- Costs for replacement can range from $150-$300 depending on vehicle make and model.
- Warnings and Recommendations:
- Ensure proper installation of new sensors to avoid future failures.
Injector Circuit Malfunction
- Symptoms: Poor acceleration; rough idling; engine misfires.
- Diagnosis Steps:
- Check fuel injectors for clogs or damage.
- Test fuel pressure to ensure adequate delivery.
- Solution:
- Clean or replace dirty injectors; replace a faulty fuel pump if needed.
- Cost Estimates:
- Cleaning injectors can cost around $50-$100; replacement can go up to $400 depending on labor.
- Warnings and Recommendations:
- Regular maintenance of fuel systems can prevent injector issues.
Closing Paragraph
The P1935 trouble code signifies important issues within your vehicle’s powertrain system that require immediate attention. Whether it’s a malfunctioning brake switch, a faulty oil temperature sensor, or injector problems, understanding these components will help you diagnose and address them effectively. Always consider consulting with a professional mechanic if you are uncertain about performing repairs yourself. Regular maintenance and timely repairs can ensure your vehicle remains safe and reliable on the road.
Frequently Asked Questions About P1935
- What does P1935 mean?
P1935 indicates a malfunction related to the brake switch/sensor signal in your vehicle’s powertrain. - Can I drive my car with a P1935 code?
It’s advisable not to drive your car until this issue is resolved, as it may affect braking performance. - How do I fix a P1935 code?
The fix typically involves inspecting and possibly replacing the brake switch or addressing related wiring issues. - What are common symptoms of P1935?
Common symptoms include a check engine light, stalling, misfiring, and starting difficulties. - Is P1935 serious?
Yes, it can indicate serious safety concerns related to braking systems. - How much does it cost to repair P1935?
Repair costs can range from $50 to $300 depending on which component needs fixing. - Can I reset my check engine light after fixing P1935?
Yes, after repairs are made, you can reset the check engine light using an OBD-II scanner. - When should I seek professional help for P1935?
If you’re unable to diagnose or repair the issue after basic troubleshooting, it’s best to consult a professional mechanic.