Powertrain, generic (extended)

P2EBB Crankcase Temperature Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2EBB is the general circuit fault of a sensor that reports the temperature inside the crankcase, i.e. of the blow-by gas or the space above the oil. Patents show what engines do with it: Ford (US9228557) feeds exhaust-heated air into the crankcase, checks the arrival with such a sensor and stores a code, possibly with MIL, if the reading stays below the expected value; GM (US5897597) diagnoses the ventilation by the temperature rise of the gas between fresh-air inlet and PCV valve. CARB 13 CCR 1968.2 (e)(9) requires the crankcase ventilation to be monitored, so a dead sensor can block that check. No manufacturer documents P2EBB publicly. The code fits signal loss or intermittent contact; out-of-range faults are P2EBE and P2EBD.

Likely causes

Connector loose or contaminated with engine oil
Harness wire breaking intermittently on the engine block
Sensor element failed internally

Symptoms

  • Check engine lamp on
  • Crankcase temperature missing or jumping in live data
  • No noticeable change in how the engine runs

Repair estimate

DifficultyEasyDIY possible
Parts and labour€50–300
Time0.3–1.5 h

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

Parts involved

crankcase temperature sensorwiring harnessecm

Related codes

P2EBCP2EBDP2EBEP04DB

References: image-ppubs.uspto.gov, image-ppubs.uspto.gov, law.cornell.edu.