Network
generic / SAE
U05A5
Invalid Data Received From NH3 Sensor
A receiving module detected implausible data from the ammonia (NH3) slip sensor downstream of the SCR. Concentration values fail plausibility checks and are rejected.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number5 / A5
Possible causes
- Module internal fault or sensor input drift high
- Software version mismatch after replacement medium
- Gateway module routing CAN messages incorrectly low
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
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 300–1500 €
- Estimated time: 0.5–3 h
- Component: nh3 sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012