P24EENH3 Sensor Processor Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P24EE says the microcontroller inside the NH3 sensor module has failed its own self-test, for example a watchdog reset, a RAM or ROM error or a timing fault. The engine controller only learns this through the status the sensor sends, because the processor is what runs the probe, the heater and the J1939 messages. Navistar explains for the 2013 N13 that its mid-bed ammonia sensor diagnoses itself and that probe and module are separate parts, ordered individually; a processor fault therefore normally means replacing the module. Repeated resets can also come from an unstable supply, so check that first. No manufacturer documents P24EE publicly. CARB requires fault detection on heavy-duty sensors. P24ED is the memory fault.
- What you may notice
- Check engine light on
- NH3 sensor data missing or frozen
- Likely causes
- LikelyElectronics of the NH3 sensor module failed
- PossibleUnstable supply voltage causing processor resets
- RareModule damaged by heat or water ingress
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €300 – €1,400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.