Engine-CodesGeneric – C1426

C1426 Code - Stop Light Switch Off Stuck Malfunction

Quick Answer

The C1426 diagnostic trouble code (DTC) specifically refers to a malfunction in the stop light switch off circuit. Common causes include Faulty stop light switch, Loose or damaged wiring connected to the stop light switch, Corrosion or dirt build-up affecting the switch's functionality. 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
C1426 indicates Stop Light Switch Off Stuck Malfunction.
Common causes
Common causes include Faulty stop light switch, Loose or damaged wiring connected to the stop light switch, Corrosion or dirt build-up affecting the switch's functionality.
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.
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code C1426 Description

The C1426 diagnostic trouble code (DTC) specifically refers to a malfunction in the stop light switch off circuit. In simpler terms, this code indicates that there is an issue with the stop light switch in the vehicle, which is responsible for turning off the brake lights when the brake pedal is released. This malfunction can have various implications for the vehicle's performance and safety systems.

OBDII Code C1426 - Stop Light Switch Off Stuck Malfunction
C1426 Code - Stop Light Switch Off Stuck Malfunction

Common Causes of C1426

  1. Faulty stop light switch.
  2. Loose or damaged wiring connected to the stop light switch.
  3. Corrosion or dirt build-up affecting the switch's functionality.
  4. Electrical issues such as blown fuses or relays related to the brake light circuit.

Symptoms of C1426

  1. Brake lights staying on constantly, even when the brake pedal is not pressed.
  2. Inability to shift out of park due to the brake light switch malfunction.
  3. Cruise control not working properly or disengaging unexpectedly.
  4. Dashboard warning lights related to the brake system or lights.

How to Fix C1426

  1. Begin by locating the stop light switch near the brake pedal. It is usually a small box-shaped component connected to the pedal arm.
  2. Inspect the wiring and connections to the switch for any signs of damage, corrosion, or looseness. Repair or replace any faulty wiring as needed.
  3. Test the stop light switch using a multimeter to determine if it is functioning properly. If the switch is faulty, replace it with a new one.
  4. Adjust the new stop light switch to ensure proper alignment with the brake pedal for accurate operation.
  5. Test the brake lights and other affected systems to confirm that the issue has been resolved.

Cost to Fix C1426

The cost of repairing a stop light switch off stuck malfunction can vary depending on the make and model of the vehicle, as well as the labor rates in your area. On average, you can expect to pay between $100 and $200 for parts and labor. However, this estimate may increase if additional components need to be replaced or if the issue requires more extensive diagnostics and repairs. As mentioned earlier, labor rates at auto repair shops typically range from $80 to $150 per hour, so it's advisable to get a quote from a reputable mechanic in your area for a more accurate cost estimate.

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Code C1426 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1426 Code

1. What are the common symptoms of OBDII code C1426 (Stop Light Switch Off Stuck Malfunction)?

- Common symptoms include the brake lights staying on continuously, difficulty shifting gears, and the inability to engage cruise control.

2. What are the possible causes of OBDII code C1426?

- The code C1426 can be caused by a faulty stop light switch, a wiring issue in the brake light circuit, or a malfunction in the brake pedal position sensor.

3. How can I diagnose the cause of OBDII code C1426?

- To diagnose the issue, start by checking the stop light switch for proper operation, inspecting the wiring for any damage or loose connections, and testing the brake pedal position sensor using a multimeter.

4. Can I continue driving with OBDII code C1426?

- It is not recommended to continue driving with OBDII code C1426 as it can affect the proper functioning of the brake lights and other safety features in the vehicle.

5. How can I repair OBDII code C1426?

- The repair for code C1426 typically involves replacing the faulty stop light switch, repairing any damaged wiring, or recalibrating the brake pedal position sensor.

6. Is OBDII code C1426 a serious issue?

- While code C1426 is not a critical issue that will cause immediate danger, it should be addressed promptly to ensure the proper operation of the vehicle's brake lights and related systems.

7. Can a DIY enthusiast fix OBDII code C1426 at home?

- Depending on your level of automotive repair experience, fixing OBDII code C1426 at home is possible by following step-by-step repair guides and using the necessary tools.

8. Will resetting the OBDII system clear code C1426?

- Resetting the OBDII system may temporarily clear code C1426, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle.

9. How long does it take to repair OBDII code C1426?

- The repair time for OBDII code C1426 can vary depending on the exact cause of the issue and the complexity of the repair, but it typically takes a few hours to complete.

10. Can OBDII code C1426 affect the vehicle's performance?

- While OBDII code C1426 may not directly affect the vehicle's performance, it can impact safety features like brake lights and cruise control, leading to potential issues while driving.

Discuss the causes and fixes for C1426 OBDII Code

  • Hello i have a 2015 toyota corolla altis ..
    i bought 2 pairs of tailights from eagleeyes but the harness did not suits the original ones .. so i had to cut the switch from the original and from the new tailights and wire them together ..
    but since then, the abs light comes on the dashboard and when i depress the brakes on 50 70 km/h the car start to vibrat and the acceleration padle is not working properly i feel like the car is weak .. what should i do?

  • You should put the wires back the way it was, and ask the taillights manufacture for more information on how to installed the lights.