U022F: Lost Communication With Object Detection Maintenance Control Module B

What it means

A control module has stopped receiving expected messages from object detection maintenance control module B. The code identifies the communication loss; it does not specify the vehicle's cleaning or alignment functions.

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

Object detection maintenance control module B supports a vehicle-specific maintenance function associated with the object-detection system. U022F sets when another module stops receiving expected messages from module B; this identifies the B-module communication loss, not the failed part or the exact feature involved.

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

• A related object-detection or maintenance function may be unavailable
• A communication fault may be stored; a warning may appear depending on the vehicle

How to diagnose it

1. Scan all modules for related network codes and freeze-frame details, comparing them with any codes for module A or the object-detection system.
2. Check the dashboard for object-detection or maintenance warnings and identify which related assistance functions are unavailable.
3. Inspect module B's connector and nearby harness for damage, corrosion, water entry, or a loose connection.
4. Check module B's power and ground against the manufacturer's specification before testing the network.
5. Test the network wiring to module B for opens, shorts, or poor connections using the vehicle wiring diagram and manufacturer's procedure.
6. If its supplies and network circuit are sound, verify module B communication with a capable scan tool before considering replacement.

Common fixes

• Reconnect or clean a loose or corroded module B connector.
• Repair damaged wiring or network connections at module B.
• Restore the module's power or ground supply.
• Replace module B only after its power, ground, and network circuits test correctly.

Can I keep driving?

Because an object-detection-related function may be unavailable and limp mode is reported, check the vehicle's warnings and operating behavior before driving. Do not rely on affected detection or assistance features; if the vehicle limits operation or shows a serious warning, stop in a safe place and arrange diagnosis.