Powertrain, generic (extended)

P27E5 Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27E5 sets when the voltage on the auxiliary pump control valve line is pulled toward ground, typically by chafed insulation touching the case or by a coil shorted internally. No manufacturer documents the code openly. For orientation: in Volkswagen's 8-speed 09P and 0GC transmissions the electric pump V475 keeps pressure while the engine is stopped, and a regulator-driven valve routes its flow; a grounded drive line would leave that valve in its spring position. CARB 13 CCR 1968.2 requires circuit monitoring for such outputs. The controller usually switches the output off to protect its driver. P27E6 is the opposite fault, a short to supply; P27E3 an open. Check the harness where it passes brackets or the oil pan.

Likely causes

Control line chafed through and touching ground
Valve coil shorted internally
Fluid or water in the connector bridging to ground

Symptoms

  • Stop-start switched off
  • MIL lit

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–4 h

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

Parts involved

aux transmission pump control valvewiring harnesstcm

Related codes

P27E3P27E4P27E6P2798

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.