P04D2EGR Temperature Sensor C 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
- Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. The code standard allows up to four EGR temperature sensors, A to D – for example before and after the cooler, or in the high- and low-pressure circuits; which is which depends on the maker. Sensor C is the third of them, usually an NTC whose low voltage means hot. P04D2 means brief excursions out of range or implausibly fast temperature jumps. FCA lists sensor C codes for its part 68142905A (Ram 2014 6.4 and 3.0 litre, Jeep and Dodge 3.6 Pentastar 2016) together with P040B, P0401 and P2457. GM checks sensor B in the same way with a jump test (40 of 50 samples). A Mack/Volvo truck bulletin names worn connector contacts at the EGR temperature sensor as a typical cause of wrong readings.
- What you may notice
- Check engine light on, may come and go
- Usually no change in driving
- Likely causes
- LikelyLoose contact or fretting at the connector pins
- PossibleWire chafing intermittently (vibration, heat)
- PossibleSensor with an internal contact fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.