Powertrain
generic / SAE
P2ACF
Reductant Temperature Sensor B Circuit High
Voltage on the reductant temperature B sensor signal line is above the expected window. Wire shorted to B+ or sensor open.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / CF
Possible causes
- Signal wire shorted to B+ high
- Open sensor medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 50–250 €
- Estimated time: 0.3–1.5 h
- Component: reductant temperature sensor b
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012