AutoCodes – Generic – C1312

C1312 Code - Short 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: C1312 indicates Short 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 6,687

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 C1312 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 C1312 - Short In Main Relay 1 Circuit - AutoCodes.com — C1312 Code - Short In Main Relay 1 Circuit

What does this mean?

What are the Possible Causes of the DTC C1312?

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 C1312?

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 C1312 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 C1312 code?

Need more information on how to fix the C1312 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1312 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1312 Hyundai — Front Left TPMS Sensor Radio Frequency Failure
C1312 KIA — Front Left TPMS Sensor Radio Frequency Failure
C1312 Lexus — Short In Main Relay 1 Circuit
C1312 Scion — Short In Main Relay 1 Circuit
C1312 Toyota — Short 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 C1312 Code

1. What are the common symptoms of OBDII code C1312 (Short In Main Relay 1 Circuit)?

- Common symptoms include difficulty starting the vehicle, intermittent stalling, and a check engine light illuminated on the dashboard.

2. What causes OBDII code C1312 to be triggered?

- OBDII code C1312 is typically triggered by a short circuit in the main relay 1 circuit of the vehicle's electrical system.

3. How can I diagnose a short in the main relay 1 circuit causing OBDII code C1312?

- To diagnose a short in the main relay 1 circuit, you may need to perform a thorough inspection of the wiring, connectors, and the relay itself. Use a multimeter to check for continuity and shorts.

4. Can a faulty battery or alternator cause OBDII code C1312 to appear?

- Yes, a faulty battery or alternator can potentially cause electrical issues that may trigger OBDII code C1312 related to a short in the main relay 1 circuit.

5. What are some repair tips for addressing OBDII code C1312?

- Repair tips for OBDII code C1312 include checking and repairing any damaged wiring, replacing the main relay 1 if necessary, and ensuring proper electrical connections.

6. Is it safe to continue driving with OBDII code C1312 present?

- It is not recommended to continue driving with OBDII code C1312 present, as it can lead to potential starting or stalling issues, compromising the vehicle's safety and performance.

7. Can resetting the OBDII system clear OBDII code C1312?

- Resetting the OBDII system may temporarily clear OBDII code C1312, but if the underlying issue causing the short in the main relay 1 circuit is not addressed, the code is likely to reappear.

8. Are there any common vehicles known to experience OBDII code C1312 frequently?

- While OBDII code C1312 can occur in various vehicles, some models from certain manufacturers may have a higher likelihood of experiencing issues related to a short in the main relay 1 circuit.

9. How much does it typically cost to repair OBDII code C1312 at a mechanic or dealership?

- The cost to repair OBDII code C1312 can vary depending on the extent of the damage and the labor rates of the mechanic or dealership. It is advisable to obtain quotes for accurate pricing.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code C1312?

- DIY enthusiasts with basic automotive knowledge may be able to address OBDII code C1312 by carefully inspecting and repairing any damaged wiring or replacing the main relay 1 themselves. If unsure, seeking professional help is recommended.