AutoCodes – Lexus – C0274 Lexus

C0274 Lexus Code - Short to B+ in ABS Motor Relay Circuit

Quick Answer

The Anti-Lock Brake System (ABS) motor relay built into the Skid Control ECU (Brake Actuator Assembly) supplies the power to the ABS Pump Motor. Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU 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: C0274 Lexus indicates Short to B+ in ABS Motor Relay Circuit.
Common causes: Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU 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 9,990

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 Jul 05, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0274 Lexus Description

The Anti-Lock Brake System (ABS) motor relay built into the Skid Control ECU (Brake Actuator Assembly) supplies the power to the ABS Pump Motor. While the ABS is activated, the Skid Control ECU (Brake Actuator Assembly) turns the motor relay ON and operates the ABS pump motor. If the voltage supplied to the motor relay is below the Diagnostic Trouble Code (DTC) detection threshold due to low voltage from the battery or alternator, these DTCs may be stored.

OBDII Code C0274 Lexus - Short to B+ in ABS Motor Relay Circuit - AutoCodes.com — C0274 Lexus Code - Short to B+ in ABS Motor Relay Circuit

What does this mean?

What are the Possible Causes of the DTC C0274 Lexus?

Faulty Skid Control ECU (Brake Actuator Assembly)
Skid Control ECU harness is open or shorted
Skid Control ECU circuit poor electrical connection

How to Fix the DTC C0274 Lexus?

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 C0274 Lexus 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.

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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 C0274 Lexus Code

1. What are the common symptoms of OBDII code C0274 in a Lexus related to the Short to B+ in ABS Motor Relay Circuit?

The common symptoms include the ABS warning light staying on, loss of ABS functionality, and potential issues with the vehicle's braking system.

2. What are some possible causes of OBDII code C0274 in a Lexus?

Possible causes include a short circuit in the ABS motor relay circuit, damaged wiring or connectors, a faulty ABS motor relay, or issues with the ABS control module.

3. How can I diagnose the OBDII code C0274 in my Lexus related to the Short to B+ in ABS Motor Relay Circuit?

Diagnosis typically involves using a scan tool to retrieve the trouble codes, inspecting the ABS motor relay circuit for shorts or damage, testing the ABS motor relay, and checking the wiring and connectors for any issues.

4. Can I continue driving my Lexus with OBDII code C0274 present?

It is not recommended to drive your vehicle with this code present, as it indicates a potential issue with the ABS system, which is crucial for safe braking performance.

5. How can I repair OBDII code C0274 in my Lexus related to the Short to B+ in ABS Motor Relay Circuit?

Repair options may include repairing or replacing damaged wiring or connectors, replacing the ABS motor relay, or addressing any issues with the ABS control module.

6. Will resetting the trouble codes make OBDII code C0274 go away permanently?

Simply resetting the trouble codes may temporarily clear the code, but if the underlying issue causing the code is not resolved, it is likely to reappear.

7. Are there any specific tools required for troubleshooting OBDII code C0274 in a Lexus?

A scan tool capable of reading ABS codes, a multimeter for electrical testing, and basic hand tools for inspecting wiring and connectors may be necessary for troubleshooting this code.

8. How urgent is it to address OBDII code C0274 in a Lexus?

It is important to address this code promptly to ensure the proper functioning of the ABS system, which is essential for safe braking performance.

9. Can extreme weather conditions affect the occurrence of OBDII code C0274 in a Lexus?

Extreme weather conditions can potentially impact the ABS system and contribute to the occurrence of this code, especially if there are issues with wiring or components that are exacerbated by temperature fluctuations.

10. How can I prevent OBDII code C0274 from occurring in my Lexus in the future?

Regular maintenance, such as checking and maintaining the ABS system components, inspecting wiring for damage, and addressing any issues promptly, can help prevent this code from occurring in the future.