Powertrain
generic / SAE
P24EC
NH3 Sensor Supply Voltage Circuit High
The NH3 slip sensor supply voltage rises above the upper limit. Either the supply is shorted to battery voltage or an internal regulator in the dosing module has failed open. The sensor electronics may be damaged if the condition persists, so the ECM disables the input.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / EC
Possible causes
- Supply line shorted to battery voltage high
- Failed voltage regulator in the dosing module medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–700 €
- Estimated time: 0.5–2 h
- Component: nh3 sensor
- Component: supply wiring
- Component: dosing module
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012