Powertrain, generic (extended)

P27E2 Electric/Auxiliary Transmission Fluid Pump B Pressure Too Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P27E2 flags that the second electric pump, B, delivered too little pressure although it was driven. Nobody publishes this code openly. Where a gearbox carries a pump labelled B, it is often a separate unit on the outside of the case: Audi's bulletin 34-17-25 calls oil pump V553 of the 0CJ, 0CK and 0CL seven-speed twin-clutch boxes pump B and lists P27A3, P27A6 and P276B for it, but not P27E2. CARB 13 CCR 1968.2 requires such actuators to be checked for proper function. Compared with P27A3, which covers no delivery at all, P27E2 points to a pump that works but weakly; P277A singles out hydraulic leakage, P27E1 is the same check on pump A. Expect stop-start or clutch cooling to be restricted.

Likely causes

Pump B worn, motor running but delivering too little
Leaking O-ring or pressure line between pump B and the gearbox
Fluid level too low for pump B to prime
Weak battery or poor ground slowing the pump motor

Symptoms

  • Stop-start no longer stops the engine
  • Reduced clutch cooling, power limited when hot
  • Warning light on

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time1–5 h

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

Parts involved

aux transmission pump btransmission fluidvalve body

Related codes

P27E1P27A3P277AP27A2

References: static.nhtsa.gov, gsi.ext.gm.com, law.cornell.edu.