Error P05EF on JAC все модели
Reductant Pump Supply Voltage Circuit Low
Code
P05EF
Vehicle
JAC все модели
Category
Powertrain
Severity
⚠️ MediumSymptoms
- AdBlue system fault warning
- Check Engine Light Is On
- Unstable operation of the SCR system
- Increased NOx emissions
- AdBlue pump is unstable or has reduced performance
Causes
- Oxidation of the pump power connector (increased resistance)
- Poor contact in the pump ground circuit
- Short circuit of the power supply to ground (additional voltage drop)
- Reduced on-board voltage (weak battery, faulty generator)
- Damage to the AdBlue pump wiring harness
How to Fix
- Check the on-board voltage with the engine running (normal: 13.5–14.5V)
- Check the voltage at the AdBlue pump power terminals when turned on.
- Measure the voltage drop on the power circuit (no more than 0.5V is acceptable)
- Clean and treat the contacts of the pump power connector
- Check and clean the ground points of the AdBlue pump
- Check the pump relay for voltage drop across the contacts
FAQ
Как проверить падение напряжения в цепи насоса?
Подключите мультиметр между клеммой питания насоса и плюсом аккумулятора при работающем насосе. Допустимое падение — не более 0,5В. Аналогично проверьте цепь массы.
Может ли P05EF пройти сам после зарядки аккумулятора?
Если причина в разряженном аккумуляторе — да. Если причина в окисленных контактах — зарядка поможет временно, но ошибка вернётся.