Powertrain, generic (extended)

P27E6 Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P27E6 means the control valve circuit of the auxiliary pump reads higher than allowed, as if the line were tied to battery voltage. A wire rubbing against a live conductor in the same harness, or a driver stage that no longer switches off, are the classic triggers. The code is not documented by any manufacturer in public. As a model of the hardware, VW's 0GC and 09P training books describe an electric pump V475 whose oil is steered by a pressure-regulated changeover valve; a permanently energized drive would hold that valve in one position. CARB 13 CCR 1968.2 calls for detecting such shorts. Because the valve cannot be released, the module typically disables stop-start. Low is P27E5, open circuit P27E3.

Likely causes

Control line shorted to a supply wire in the harness
Corrosion bridging adjacent pins in the connector
Output stage in the control module stuck on

Symptoms

  • Stop-start inoperative
  • Warning light on, possibly further pump codes

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,000
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

P27E3P27E4P27E5P2799

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