U023A: Lost Communication With Image Processing Module A

What it means

A control module has stopped receiving expected messages from image processing module A. The code identifies the communication loss; image-processing functions that rely on the module may be unavailable.

At a glance

• Usually lights the warning light of the system that lost communication
• The engine or gearbox may go into limp mode

How it works

Image processing module A analyzes image data used by one or more vehicle functions, which may include driver assistance. U023A is set when another module stops receiving expected network messages from this particular image processing module.

Common causes

Most likely first.

1. Loss of power or ground to the module
2. Open, shorted, or damaged network wiring or connector
3. Failed module

Symptoms

• One or more image-processing or driver-assistance functions may be unavailable
• A warning may appear depending on the vehicle

How to diagnose it

1. Use a scan tool to record freeze-frame data and check for related image-processing, camera, or network codes that identify the affected function.
2. Check live data or system status for module A and note which image-based or driver-assistance features report unavailable.
3. Inspect module A’s connector and accessible network wiring, including any related camera connections identified by vehicle information, for looseness, corrosion, or damage.
4. Check the module’s power and ground against the manufacturer’s wiring information.
5. Test the network wiring to image processing module A for opens or shorts using the manufacturer’s procedure.
6. If wiring and supplies are good, follow the vehicle-specific diagnostic procedure to confirm whether module A has failed.

Common fixes

• Reconnect or repair a loose or corroded connector at image processing module A.
• Repair damaged network wiring to module A.
• Restore the module’s power or ground connection.
• Replace image processing module A if testing confirms it has failed.

Can I keep driving?

Assume any driver-assistance function that depends on image processing module A is unavailable, and do not rely on it to judge hazards or control the vehicle. Drive cautiously and arrange diagnosis promptly.