Powertrain, generic · Transmission

P070C Transmission Fluid Level Sensor Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Fluid level sensors in the transmission sump report the oil level to the transmission module as a voltage; an Allison patent converts it to millimetres and only accepts readings with the vehicle at rest, warm fluid, low input speed and a tilt correction. Such sensors are mainly found in heavy automatic transmissions. No manufacturer document available to us uses this code. P070C means the sensor signal is below its lower limit – typically the signal wire shorted to ground or a sensor shorted internally. Because the oil level does not usually affect emissions directly, a rating without the check engine light is likely; expect a transmission warning or a missing level display. An actually low oil level is P070F.

Likely causes

Signal wire to the level sensor shorted to ground (chafing, transmission connector)
Level sensor faulty internally
Transmission connector soaked in oil or corroded
Module input faulty

Symptoms

  • Fluid level display missing or warning to check transmission fluid
  • Usually no driveability problems
  • Transmission warning lamp depending on manufacturer

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–500
Time1–3 h

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

Parts involved

transmission fluid level sensorsensor wiringtransmission control module

Related codes

P070AP070BP070DP070EP070F

References: law.cornell.edu, patents.google.com.