AutoCodes – Lexus – B2274 Lexus

B2274 Lexus Code - ACC Monitor Malfunction

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when a malfunction in the ACC output circuit is detected. Common causes include Faulty ACC Relay, Faulty Certification ECU (Smart Key ECU Assembly), Certification ECU 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: B2274 Lexus indicates ACC Monitor Malfunction.
Common causes: Common causes include Faulty ACC Relay, Faulty Certification ECU (Smart Key ECU Assembly), Certification ECU 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 2,465

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 13, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2274 Lexus Description

This Diagnostic Trouble Code (DTC) is stored when a malfunction in the ACC output circuit is detected. The ACC output circuit is the circuit that goes from the ACC output terminal of the Certification ECU (Smart Key ECU Assembly) to the ACC Relay.

OBDII Code B2274 Lexus - ACC Monitor Malfunction - AutoCodes.com — B2274 Lexus Code - ACC Monitor Malfunction

What does this mean?

What are the Possible Causes of the DTC B2274 Lexus?

Faulty ACC Relay
Faulty Certification ECU (Smart Key ECU Assembly)
Certification ECU harness is open or shorted
Certification ECU circuit poor electrical connection

How to Fix the DTC B2274 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 B2274 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 B2274 Lexus Code

1. What are the common symptoms of OBDII code B2274 in a Lexus related to the ACC Monitor Malfunction?

- Common symptoms include the malfunction indicator light (MIL) illuminating, issues with the adaptive cruise control system, and possible loss of cruise control function.

2. What are some potential causes of the ACC Monitor Malfunction OBDII code B2274 in a Lexus?

- Possible causes include a faulty radar sensor, damaged wiring or connectors in the adaptive cruise control system, or a problem with the control module.

3. How can I diagnose the ACC Monitor Malfunction OBDII code B2274 in my Lexus?

- Diagnosis typically involves checking the radar sensor for proper operation, inspecting wiring and connectors for damage, and using a diagnostic scanner to read and clear the fault code.

4. Can I still drive my Lexus with the ACC Monitor Malfunction OBDII code B2274?

- It is generally safe to continue driving your vehicle with this code, but it is recommended to have the issue diagnosed and repaired as soon as possible to ensure the proper functioning of the adaptive cruise control system.

5. What are some repair tips for fixing the ACC Monitor Malfunction OBDII code B2274 in a Lexus?

- Repair tips may include checking and cleaning radar sensor surfaces, repairing or replacing damaged wiring, and recalibrating the adaptive cruise control system after repairs are made.

6. Will resetting the OBDII code B2274 in my Lexus make the problem go away permanently?

- Resetting the code may temporarily turn off the MIL, but if the underlying issue causing the ACC Monitor Malfunction is not addressed, the code is likely to reappear.

7. How much does it typically cost to repair the ACC Monitor Malfunction OBDII code B2274 in a Lexus?

- Repair costs can vary widely depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix the ACC Monitor Malfunction OBDII code B2274 in a Lexus?

- While some simple checks and repairs may be possible for DIY enthusiasts, diagnosing and repairing complex issues related to the adaptive cruise control system may require professional expertise and specialized tools.

9. Are there any recalls or technical service bulletins related to the ACC Monitor Malfunction OBDII code B2274 in Lexus vehicles?

- It's recommended to check with your local Lexus dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to this specific OBDII code.

10. How can I prevent the ACC Monitor Malfunction OBDII code B2274 from occurring in my Lexus?

- Regularly maintaining your vehicle, including keeping the adaptive cruise control system clean and free from debris, and addressing any warning signs promptly, can help prevent the occurrence of this OBDII code.