Powertrain, generic · Transmission

P094A Hydraulic Pump Driver Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Concerns the electronic driver that powers the motor of a hydraulic or electric oil pump, often a separate pump controller. The driver reports, or the module infers, that it cannot deliver the commanded speed or current although the circuit is not open or shorted. No manufacturer documents this exact code publicly. Hyundai shows what such a driver monitors on its wet 8-speed DCT pumps: overcurrent, current and Hall sensor faults and internal faults, filed under its own P193D and P1C2E codes. Mercedes reports an internal fault of the 722.9 auxiliary oil pump under P0944 instead. CARB requires functional checks on outputs. P094B and P094C are stuck pump faults, P094D overheating, P094E supply; P0C29 is the equivalent for auxiliary fluid pumps of automatics.

Likely causes

Internal fault of the pump controller or driver stage
Pump motor drawing excess current (worn bearings, fluid in motor)
High resistance in supply or ground of the driver

Symptoms

  • Warning light on
  • Auto stop-start disabled
  • Delayed engagement or slower shifts

Repair estimate

DifficultyHardWorkshop job
Parts and labour€200–1,500
Time1–4 h

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

Parts involved

hydraulic pumpwiring harnesstcm

Related codes

P094BP094CP094DP094EP0C29

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