Powertrain, generic · Transmission

P094E Hydraulic Pump Supply Voltage Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Fault in the power feed of the hydraulic or electric oil pump: fuse, supply wire, connector or relay output. The module sees missing or implausible supply at the pump or its controller. No manufacturer documents this exact code publicly. Mercedes shows the checks that belong to it on the electric auxiliary oil pump of the 722.9 automatic, although it reports that pump under P0944: connector and fuse first, then supply voltage and CAN lines. Hyundai lists an open circuit of its DCT high-flow pump as P193D13. CARB requires circuit checks on outputs. P0945 to P0948 concern the control side, P094A the driver, P0562 general low system voltage. Without supply the pump stops and stop-start is usually blocked.

Likely causes

Blown pump fuse
Open or corroded supply wire or connector
Weak battery or poor main ground lowering pump supply voltage

Symptoms

  • Warning light on
  • Pump does not run
  • Stop-start disabled or gearbox in limp mode

Repair estimate

DifficultyMediumDIY possible
Parts and labour€10–600
Time0.3–3 h

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

Parts involved

hydraulic pumpwiring harnesstcm

Related codes

P0945P094AP094DP0562

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