NH3 Sensor Processor Performance
The microcontroller inside the smart NH3 slip sensor reports an internal performance fault — failed self-test, watchdog reset, or out-of-range plausibility checks. The sensor cannot guarantee its output value, the ECM marks the channel invalid and disables SCR closed-loop control on this branch.
Affected components
- Nh3 sensor
- Sensor microcontroller
Common causes
- High likelihood: Internal processor or firmware fault
- Medium likelihood: Brown-out from supply voltage dips
- Low likelihood: Module software outdated, reflash may resolve
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.