Powertrain, generic (extended)

P27E8 Transmission Range Control B Circuit Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P27E8 is the plausibility test for range control circuit B: the signal is neither open nor shorted, yet its value makes no sense, for example a level stuck between the valid on and off windows. The title reads Circuit Performance, without Range. No manufacturer publishes the code. Mitsubishi's 2022 shift-by-wire CVT shows the A version, P07E9: a selector sensor voltage sitting for 2.4 s in a forbidden band (such as 2.12 to 2.67 V) counts as a fault, with no fail-safe action because the other sensors still identify the position. A second channel would be judged the same way. Contact resistance, moisture in the selector or an aging Hall element are the likely sources. Open, low and high are P27E7, P27E9 and P27EA.

Likely causes

Contact resistance at selector terminals shifting the voltage
Spilled drink or moisture inside the selector
Position sensor in the selector degrading

Symptoms

  • Intermittent shift system warning
  • Displayed range occasionally flickers or lags

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,000
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

P27E7P27E9P27EAP07E9P27F0

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