OBD-II code · Network
U030D Software Incompatibility With NOx Sensor A
A module reports a software version mismatch with NOx sensor A (smart sensor with own ECU) — typically after replacing one of the modules without programming the new unit to match the rest of the network.
Is it safe to drive with U030D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule replaced without programming
- PossibleWrong part number for the vehicle
- Less likelyGateway 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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor A
Related codes
- U030ESoftware Incompatibility With NOx Sensor B
- U0352Software Incompatibility With NOx Sensor C
- U030ASoftware Incompatibility With Evaporative Emission System Leak Detection Control Module
- U030BSoftware Incompatibility With Glow Plug Control Module 2
- U030CSoftware Incompatibility With Reductant Quality Module
- U030FSoftware Incompatibility With Reductant Control Module
- U0310Software Incompatibility With Fuel Pump Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.