Powertrain, generic (extended)

P27EA Transmission Range Control B Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With P27EA, a signal of range control circuit B reads near the supply voltage, which usually means a short to a power wire or a broken ground return that lets the line float high. No manufacturer documents the B code openly. Mitsubishi's channel A twin, P07EB, sets above 4.5 V on one of the eight sensors in the electric selector for 2.4 s and lists a short to power as cause; normal driving remains possible. A missing sensor ground produces the same picture as a short to battery, so check the ground pin before replacing the selector. In shift-by-wire systems a high reading on one channel is cross-checked against the remaining channels. P27E9 is the low counterpart, P27E7 the open circuit.

Likely causes

Signal line shorted to a supply wire
Sensor ground open, signal floats high
Selector electronics faulty

Symptoms

  • Shift system message in the cluster
  • Car usually still drives normally

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–3 h

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

Parts involved

transmission range control actuator bwiring harnesstcm

Related codes

P27E7P27E8P27E9P07EBP27F2

References: mitsubishitechinfo.com, en.wikipedia.org, law.cornell.edu.