What it means
A module reports a software version mismatch with NOx sensor C (smart sensor with own ECU) — 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
- Affects emissions; the car can fail an emissions test
How it works
NOx sensor C is a smart exhaust sensor with its own electronics, which measures nitrogen oxides and sends processed data to the vehicle network. A control module checks the sensor's reported software identity and configuration; U0352 sets when sensor C's information is incompatible with the expected setup.
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 NOx, emissions, aftertreatment, and communication codes before clearing faults.
- Check whether NOx sensor C or a related module was recently replaced, updated, or configured.
- Use a capable scan tool to identify which sensor the vehicle labels C and read its reported identity and software information.
- With the exhaust cool, inspect sensor C's wiring and connector for heat damage, corrosion, looseness, or contact with the exhaust.
- Check live data and communication status for sensor C and compare its reported values or status with the other NOx sensors if available.
- If the wiring is sound and the sensor part is correct, have its software compatibility and vehicle configuration checked against the manufacturer's requirements.
Common fixes
- Repair heat-damaged, loose, or corroded wiring and connector faults at NOx sensor C.
- Correct the sensor C configuration if it was set up incorrectly.
- Program a replacement smart NOx sensor C if the vehicle requires configuration after installation.
- Replace sensor C with the correct compatible part if its part number or software is unsuitable.
- Resolve a confirmed network or gateway configuration fault affecting sensor C.
Can I keep driving?
The vehicle may continue to run, but NOx monitoring and emissions control can be affected, and an emissions warning or reduced-power restriction may follow. Avoid ignoring the fault or using the vehicle for extended trips before checking it.
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.