Powertrain, generic (extended)

P276A Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P276A means the power feed to the motor of a second electric transmission fluid pump, labelled B, is interrupted. Such pumps keep hydraulic pressure or lubrication alive when the engine-driven pump is idle, for instance during stop-start or in a dual-clutch gearbox. No manufacturer documents P276A publicly. Audi shows what pump B is in bulletin 34-17-25 for the 2017 A4, A5, A6 and 2018 Q5 with seven-speed dual-clutch units 0CJ, 0CK and 0CL: the gear oil pump V553, which reports supply faults to the TCM under P276B00. CARB requires such actuators to be checked for open circuits. A blown fuse, a corroded pump connector or a broken supply wire are typical; with the pump dead the gearbox may restrict stop-start or limit performance.

Likely causes

Blown fuse in the pump supply
Corroded or oil-contaminated pump connector
Broken supply wire or relay contact

Symptoms

  • Transmission warning lamp
  • Stop-start deactivated
  • Reduced performance or limp mode in some designs

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–900
Time0.5–3 h

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

Parts involved

aux trans pump bsupply circuitwiring harness

Related codes

P276BP276CP276DP27A3P2796

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