AutoCodes – Generic – C1425

C1425 Code - Open In Stop Light Switch Circuit

Quick Answer

The Skid Control ECU (Actuator Assembly) detects the brake operating conditions through a signal transmitted by the stop light switch. Common causes include Stop Lamp Fuse, Faulty Stop Light Switch, Stop Light Switch harness is open or shorted. 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: C1425 indicates Open In Stop Light Switch Circuit.
Common causes: Common causes include Stop Lamp Fuse, Faulty Stop Light Switch, Stop Light Switch harness is open or shorted.
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.

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Code Popularity 23,537

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 29, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1425 Description

The Skid Control ECU (Actuator Assembly) detects the brake operating conditions through a signal transmitted by the stop light switch. The Skid Control ECU (Actuator Assembly) incorporates a circuit to detect an open circuit. This Diagnostic Trouble Code (DTC) is output when an open circuit is detected in the stop light signal input line.

OBDII Code C1425 - Open In Stop Light Switch Circuit - AutoCodes.com — C1425 Code - Open In Stop Light Switch Circuit

What does this mean?

What are the Possible Causes of the DTC C1425?

Stop Lamp Fuse
Faulty Stop Light Switch
Stop Light Switch harness is open or shorted
Stop Light Switch circuit poor electrical connection
Faulty Skid Control ECU (Actuator Assembly)

How to Fix the DTC C1425?

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 C1425 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.

Need more information about the C1425 code?

Need more information on how to fix the C1425 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1425 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1425 Lexus — Open In Stop Light Switch Circuit
C1425 Scion — Open In Stop Light Switch Circuit
C1425 Toyota — Open In Stop Light Switch Circuit

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 C1425 Code

1. What are the common symptoms of OBDII code C1425 (Open In Stop Light Switch Circuit)?

- The common symptoms include the brake lights not working properly, the cruise control not engaging, and the inability to shift out of Park.

2. What are the possible causes of OBDII code C1425?

- The code C1425 can be caused by a faulty stop light switch, damaged wiring or connectors in the stop light circuit, or a malfunctioning brake pedal position sensor.

3. How can I diagnose the issue related to OBDII code C1425?

- You can start by checking the stop light switch for proper operation, inspecting the wiring and connectors for any visible damage, and using a scan tool to monitor brake pedal position sensor data.

4. Can I drive my vehicle with OBDII code C1425 active?

- It is not recommended to drive your vehicle with the C1425 code active, as it can affect the proper functioning of essential safety features like brake lights.

5. How can I repair OBDII code C1425 on my own?

- You can attempt to replace the faulty stop light switch or repair any damaged wiring or connectors in the stop light circuit. However, if you are not experienced with automotive repairs, it is advisable to seek professional help.

6. Is it safe to ignore OBDII code C1425 and continue driving?

- Ignoring the C1425 code can lead to safety hazards, such as other drivers not being able to see when you are braking. It is best to address the issue promptly to ensure the proper functioning of your vehicle's brake lights.

7. Will resetting the OBDII code C1425 make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not fixed, it is likely to reappear.

8. Can a malfunctioning brake pedal position sensor cause OBDII code C1425?

- Yes, a malfunctioning brake pedal position sensor can trigger the C1425 code as it is a crucial component in the stop light circuit.

9. Are there any safety concerns associated with OBDII code C1425?

- Yes, there are safety concerns associated with the C1425 code, as it can affect the proper operation of brake lights, which are essential for signaling your intentions to other drivers on the road.

10. How long does it typically take to repair OBDII code C1425?

- The repair time for the C1425 code can vary depending on the specific cause of the issue. Simple fixes like replacing the stop light switch may take less than an hour, while more complex wiring repairs could take longer.