AutoCodes – Generic – C1311

C1311 Code - Open In Main Relay 1 Circuit

Quick Answer

The Anti-Lock Brake System (ABS) main relay 1 (ABS No.1 relay) supplies power to the changeover solenoid and the linear solenoid. Common causes include Faulty Anti-Lock Brake System (ABS) Main Relay 1, ABS Main Relay 1 harness is open or shorted, ABS Main Relay 1 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: C1311 indicates Open In Main Relay 1 Circuit.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Main Relay 1, ABS Main Relay 1 harness is open or shorted, ABS Main Relay 1 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.

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Code Popularity 9,815

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 Sep 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1311 Description

The Anti-Lock Brake System (ABS) main relay 1 (ABS No.1 relay) supplies power to the changeover solenoid and the linear solenoid. ABS main relay 2 (ABS No.2 relay) goes on for approximately 5 seconds after the ignition switch is turned off and the braking effort signal input is terminated. ABS main relay 2 (ABS No.2 relay) supplies electricity and maintains operating condition for the brake system when the ignition switch is off.

OBDII Code C1311 - Open In Main Relay 1 Circuit - AutoCodes.com — C1311 Code - Open In Main Relay 1 Circuit

What does this mean?

What are the Possible Causes of the DTC C1311?

Faulty Anti-Lock Brake System (ABS) Main Relay 1
ABS Main Relay 1 harness is open or shorted
ABS Main Relay 1 circuit poor electrical connection

How to Fix the DTC C1311?

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 C1311 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 C1311 code?

Need more information on how to fix the C1311 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1311 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1311 Lexus — Open In Main Relay 1 Circuit
C1311 Scion — Open In Main Relay 1 Circuit
C1311 Toyota — Open In Main Relay 1 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 C1311 Code

1. What are the common symptoms of OBDII code C1311 (Open In Main Relay 1 Circuit)?

- The common symptoms include difficulty starting the vehicle, engine stalling, or the engine not starting at all.

2. What can cause the OBDII code C1311 to trigger?

- The code C1311 is typically triggered by an open circuit in the main relay 1 circuit, which can be caused by a faulty relay, damaged wiring, or poor connections.

3. How can I diagnose the issue related to OBDII code C1311?

- To diagnose the issue, you can use a scan tool to read the code and then inspect the main relay 1, related wiring, and connections for any visible damage or issues.

4. What are some DIY repair tips for fixing the Open In Main Relay 1 Circuit issue?

- DIY repair tips may include checking and replacing the main relay 1 if faulty, repairing damaged wiring, and ensuring all connections are secure and free of corrosion.

5. Can driving with the OBDII code C1311 present cause further damage to the vehicle?

- Continuing to drive with the C1311 code present may lead to further issues like engine stalling or complete failure to start, so it's best to address the problem promptly.

6. Is it safe to reset the OBDII code C1311 and continue driving without fixing the underlying issue?

- Resetting the code without fixing the underlying issue may temporarily clear the warning light, but the problem will persist and could lead to more severe issues if left unresolved.

7. How much does it typically cost to repair the Open In Main Relay 1 Circuit issue related to OBDII code C1311?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the main relay 1, repairing wiring, or addressing connection problems, which could range from moderate to significant expenses.

8. Can a professional mechanic help with diagnosing and repairing the OBDII code C1311 issue?

- Yes, a professional mechanic can use specialized tools and expertise to accurately diagnose and repair the Open In Main Relay 1 Circuit problem indicated by code C1311.

9. Are there any preventative measures to avoid triggering the OBDII code C1311 in the future?

- Regularly checking and maintaining the electrical components in the main relay circuit, such as the relay itself and related wiring, can help prevent issues that may trigger the C1311 code.

10. How urgent is it to address the OBDII code C1311 (Open In Main Relay 1 Circuit) once it appears?

- It is recommended to address the issue promptly to prevent potential vehicle stalling or starting problems that could leave you stranded and require more extensive repairs.