OBD-II code · Network
U05A8 Invalid Data Received From NOx Sensor C
A receiving module detected implausible data from NOx sensor C (smart sensor with own ECU). NOx concentration or pumping current values fail plausibility checks and are rejected.
Is it safe to drive with U05A8?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- 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
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Nox Sensor C
Related codes
- U059EInvalid Data Received From NOx Sensor A
- U059FInvalid Data Received From NOx Sensor B
- U05A5Invalid Data Received From NH3 Sensor
- U05A6Invalid Data Received From Reductant Heater Control Module
- U05A7Invalid Data Received From Safety Integration Control Module
- U05A9NOx Sensor C Received Invalid Data From ECM/PCM
- U05AAInvalid Data Received From Charge Air Cooler Coolant Pump
- U05ABInvalid Data Received From Engine Disconnect Clutch
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.