P2ACDReductant Temperature Sensor B Circuit Range/Performance
- 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
- P2ACD flags a reductant temperature sensor B reading that is electrically fine but disagrees with the other temperatures the SCR controller knows, typically checked after a cold soak, when DEF lines, tank and ambient should read about the same. No manufacturer publicly describes P2ACD. The sensor A counterpart shows the pattern: Deutz files P2043-64 as a plausibility error of the DEF temperature input, and Ford bulletin 18-2190 for the 2011–2015 6.7L Super Duty treats P2043 alone as a software case (PCM reprogram) and calls for a new heater and sender unit only when P205C or P205D appear as well. A B-side plausibility code without circuit codes therefore deserves a software check before parts are ordered. P2ACC, P2ACE and P2ACF cover the electrical faults.
- What you may notice
- Check engine light after a cold start
- SCR warning with no noticeable driving change
- Likely causes
- PossibleController software with an overly tight plausibility check
- PossibleSensor B drifting from its characteristic
- RareLine heater warming the sensor area during the check
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.