Powertrain, generic · Auxiliary emission controls

P04D0 EGR Temperature Sensor C Circuit Low

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. P04D0 means its signal voltage is below the lower limit – extremely hot, or more often the signal line shorted to ground or the sensor shorted. 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. No threshold is published for sensor C; for sensor B Ford diesels use below 0.19 V and GM diesels below 164 Ω.

Likely causes

Signal line shorted to ground (chafed hot harness)
Sensor shorted internally
Moisture or corrosion in the connector
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

P04CEP04D1P04CFP04D2P040CP041C

References: static.nhtsa.gov, static.nhtsa.gov, fordservicecontent.com.