AutoCodes – Lexus – P3233 Lexus

P3233 Lexus Code - Open or Short to B Positive in Blocking of Hybrid Vehicle Gate Connection

Quick Answer

The P3233 code indicates a problem in the emergency shutdown signal circuit between the Hybrid Vehicle (HV) control ECU and the inverter with converter assembly. Common causes include Faulty Hybrid Vehicle (HV) Control ECU, Hybrid Vehicle Control ECU harness is open or shorted, Hybrid Vehicle 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: P3233 Lexus indicates Open or Short to B Positive in Blocking of Hybrid Vehicle Gate Connection.
Common causes: Common causes include Faulty Hybrid Vehicle (HV) Control ECU, Hybrid Vehicle Control ECU harness is open or shorted, Hybrid Vehicle 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 60

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 Oct 13, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P3233 Lexus Description

The P3233 code indicates a problem in the emergency shutdown signal circuit between the Hybrid Vehicle (HV) control ECU and the inverter with converter assembly. This code sets when the system detects an open or short to battery voltage (+B) in the shutdown signal line while the high-voltage gate is active (driving). The hybrid vehicle control ECU oversees managing and coordinating hybrid system operation and can command an emergency shutdown to protect components. A fault in this circuit may prevent proper shutdown, so the ECU sets P3233 to safeguard the high-voltage system and ensure the inverter and motor generator are safely controlled.

OBDII Code P3233 Lexus - Open or Short to B Positive in Blocking of Hybrid Vehicle Gate Connection - AutoCodes.com — P3233 Lexus Code - Open or Short to B Positive in Blocking of Hybrid Vehicle Gate Connection

What does this mean?

What are the Possible Causes of the DTC P3233 Lexus?

Faulty Hybrid Vehicle (HV) Control ECU
Hybrid Vehicle Control ECU harness is open or shorted
Hybrid Vehicle Control ECU circuit poor electrical connection
Faulty Inverter with Converter Assembly

How to Fix the DTC P3233 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 P3233 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.

Need more information about the P3233 Lexus code?

Need more information on how to fix the P3233 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P3233 Lexus code diagnosed by a professional: Find a repair shop in your area

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.