U0234: Lost Communication With Convenience Recall Module

What it means

A control module has stopped receiving expected messages from the convenience recall module. The code identifies the communication loss; it does not specify which stored positions or functions the vehicle supports.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

The convenience recall module stores or coordinates vehicle-specific convenience settings or positions and communicates them to other modules. U0234 sets when a receiving module stops getting expected messages from it; the code does not specify which stored positions or recall features the vehicle supports.

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

• Convenience recall functions 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 communication codes and freeze-frame details, noting whether the fault appeared with other body or seat-related codes.
2. Try the vehicle's convenience recall controls and note which supported settings or positions fail to recall.
3. Inspect the module's connector and nearby wiring for looseness, corrosion, water entry, or damage.
4. Check the module's power and ground against the manufacturer's specification.
5. Test the module's network wiring for opens, shorts, or poor connections using the vehicle wiring diagram and manufacturer's procedure.
6. If circuits are sound, verify that a capable scan tool can communicate with the convenience recall module before considering replacement.

Common fixes

• Reconnect or clean a loose or corroded module connector.
• Repair damaged network wiring to the convenience recall module.
• Restore a failed power or ground connection.
• Replace the convenience recall module if its supplies and network wiring test correctly but it remains offline.

Can I keep driving?

The fault usually affects convenience recall features rather than basic vehicle control, so driving may be possible if seating and other controls are positioned safely. Adjust the seat and mirrors manually before moving if their stored positions cannot be recalled.