P2043Reductant Temperature Sensor A 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
- P2043 flags a temperature reading from reductant sensor A that is electrically valid but does not fit the other temperatures the system knows. Deutz stores it as P2043-64, a plausibility error of the DEF temperature sensor in the SCR system (SPN 4337), separate from the tank sensor check P205B-64. Ford uses the code on 2011–2012 F-250/F-350 and 2011–2015 F-450/F-550 with the 6.7L diesel built up to 9 Dec 2014: per bulletin 18-2190, P2043 on its own only needs a PCM reprogram, while P2043 together with P205C or P205D calls for a new reductant heater and sender assembly as well. A plausibility code alone therefore often points to software or a cold soak case rather than to a broken part. Open and shorted circuits are P2042, P2044 and P2045.
- What you may notice
- MIL, often without noticeable driving change
- DEF heater may run at the wrong time
- Likely causes
- LikelyEngine control software, fixed by reprogramming (Ford 6.7L)
- PossibleTemperature sensor drifting or slow to respond
- RareFrozen or partly thawed DEF around the sensor
- RareContact resistance in the connector shifting the reading
- 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: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.