Electric/Auxiliary Transmission Oil Pump – Phase V Motor, Excessive Current. The controller detected too high current intensity in the phase V circuit of the auxiliary ATF pump motor.
OBD-II (EN): ATF Auxiliary Oil Pump VVT Engine Circuit High Current
Code P0B05 means the vehicle controller detected excessive electrical current in phase V of the auxiliary transmission oil pump motor. The cause may be a damaged pump motor, a short circuit in the electrical system, or degraded ATF oil overloading the pump. Due to the risk of transmission damage, prompt diagnosis at a workshop equipped with a professional diagnostic tester is recommended.
- Check Engine Light (MIL) on - Deteriorated shift smoothness or hard shifting - Transmission overheating or increased ATF temperature - Possible transmission entering limp mode - Loss of hydraulic assistance for the drivetrain - In hybrid vehicles, possible limitation of energy regeneration
- Faulty electric motor of the auxiliary transmission oil pump (burned phase V winding, internal short circuit) - Short circuit in the wiring harness or connector of the pump phase V circuit - Faulty pump controller (MOSFET driver or other power component) - Contaminated or degraded ATF oil causing increased pump load - Mechanical seizure of the pump rotor (foreign object, corrosion, bearing damage) - Faulty Transmission Control Module (TCM) or its power supply
Moduł sterowania energią baterii wysokiego napięcia – żądanie zapalenia lampki MIL. Kod wskazuje na wykrycie przez moduł BECM anomalii w pracy układu akumulatora trakcyjnego pojazdu hybrydowego lub elektrycznego.
Based on the systems affected by this code, we will most likely start with:
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.