P24E5NH3 Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P24E5 covers an NH3 sensor signal that jumps or drops out for short moments while staying mostly in range. Vibration, heat cycling of the exhaust and road salt make loose connector pins and cracked insulation near the SCR can the main suspects. Ram fitted such a sensor to the 2014 3500 to 5500 cab chassis with the 6.7 L Cummins; bulletin 18-042-20 offers one engine calibration for trucks that keep it and another for trucks where it was removed, and warns that implausible-data or lost-communication codes appear when the wrong one is loaded. No manufacturer documents P24E5 publicly. CARB asks for erratic-signal detection on heavy-duty emission sensors. Steady faults are P24E3 and P24E4.
- What you may notice
- Warning lamp that comes and goes
- Live data shows spikes in the ammonia value
- Likely causes
- LikelyLoose or corroded pins at the sensor or module connector
- PossibleHarness insulation cracked by exhaust heat and vibration
- RareSporadic internal fault in the sensor electronics
- 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: €80 – €1,400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.