What it means
A module reports a software version mismatch with active grille shutter module C — typically after replacing one of the modules without programming the new unit to match the rest of the network.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
Active grille shutter module C controls grille shutters in a separately identified section of the vehicle's airflow system, where fitted. A control module checks module C's software identity and configuration against the expected setup; U0350 sets when they do not match.
Common causes
Most likely first.
- Module replaced without programming
- Wrong part number for the vehicle
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Record freeze-frame data and scan all modules for grille shutter, cooling, and communication faults specific to module C.
- Check recent service records for replacement, software updates, or configuration work involving module C or related controllers.
- Use a capable scan tool to read module C's identity and software data and compare it with the vehicle's required configuration.
- Inspect the C shutter section for debris or damage, then examine its connector and accessible wiring for corrosion, looseness, or broken insulation.
- Check whether module C communicates and, if available, compare commanded shutter position with its reported position.
- If the hardware and network connections are correct, have module C programmed or configured to the manufacturer's requirements.
Common fixes
- Remove debris or correct a physical obstruction at shutter section C.
- Correct module C's configuration.
- Program the replacement module C with compatible vehicle software.
- Replace module C if the installed part number is incompatible.
- Repair wiring or connector faults that interrupt module C communication.
Can I keep driving?
Stop if a cooling warning appears or the vehicle begins to overheat, as grille airflow control may be affected. If there are no temperature warnings, keep driving moderate and monitor the temperature until module C is corrected.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.