AutoCodes – Generic – U023B

U023B Code - Lost Communication With Image Processing Module 'B'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Image Processing Module 'B', Image Processing Module 'B' harness is open or shorted, Image Processing Module 'B' 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: U023B indicates Lost Communication With Image Processing Module 'B'.
Common causes: Common causes include Faulty Image Processing Module 'B', Image Processing Module 'B' harness is open or shorted, Image Processing Module 'B' 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 7,760

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 Apr 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U023B Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Image Processing Module 'B' has not been received.

OBDII Code U023B - Lost Communication With Image Processing Module 'B' - AutoCodes.com — U023B Code - Lost Communication With Image Processing Module 'B'

What does this mean?

What are the Possible Causes of the DTC U023B?

Faulty Image Processing Module 'B'
Image Processing Module 'B' harness is open or shorted
Image Processing Module 'B' circuit poor electrical connection

How to Fix the DTC U023B?

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 U023B 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 U023B Code

1. What does the OBDII code U023B mean?

U023B indicates that the vehicle has lost communication with Image Processing Module 'B,' which is responsible for processing visual data for systems like advanced driver assistance.

2. What are the common symptoms of the U023B code?

Symptoms may include malfunctioning driver assistance features like lane-keeping assist, adaptive cruise control, or traffic sign recognition, as well as the illumination of the check engine or warning lights.

3. What causes the U023B code to appear?

Common causes include faulty wiring or connections to the Image Processing Module 'B,' a failure of the module itself, or issues with the vehicle's CAN (Controller Area Network) communication system.

4. Can I still drive my car with the U023B code?

Yes, you can typically still drive the car, but advanced safety and driver assistance features may not function properly, which could increase the risk of accidents.

5. How do I diagnose the U023B code?

Diagnosis involves checking the wiring and connectors for damage or corrosion, scanning the CAN network for other communication faults, and testing the Image Processing Module 'B' for functionality.

6. How do I fix the U023B code?

Repairs may include repairing or replacing damaged wiring, cleaning or tightening loose connections, updating module software, or replacing the Image Processing Module 'B' if it is defective.

7. Can low battery voltage cause the U023B code?

Yes, low battery voltage or power supply issues can disrupt communication with the module and trigger the U023B code.

8. Is the U023B code specific to any car brands or models?

No, the U023B code is a generic OBDII code and can appear on various makes and models, though the specific function of Image Processing Module 'B' may vary.

9. How much does it cost to fix the U023B code?

Repair costs can vary widely depending on the cause, ranging from $100 for wiring repairs to over $1,000 if the Image Processing Module 'B' needs replacement.

10. Can a software update fix the U023B code?

Yes, in some cases, a software update for the module or the vehicle's ECU can resolve communication issues and clear the U023B code.