Powertrain, generic · Auxiliary emission controls

P04CE EGR Temperature Sensor C Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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. P04CE is its general circuit fault, without separating low and high. 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. Thresholds are not published. Without a valid temperature the EGR flow model is wrong, so the module uses a substitute value or switches EGR off.

Likely causes

Open or poor contact in signal or ground line
Connector or wire at the sensor corroded or worn by heat and vibration
Sensor faulty (element broken or sooted)
Engine module input

Symptoms

  • Check engine light on
  • Usually no change in driving (EGR on a substitute value or off)
  • Possibly EGR flow or cooler codes (P0401, P2457)

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–300
Time0.5–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr temperature sensor csensor wiringengine control module

Related codes

P04CFP04D0P04D1P04D2P040BP2457

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.