Powertrain, generic · Hybrid propulsion

P0A5D Drive Motor A Phase U Current

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A5D concerns the current in phase U of drive motor A, as seen by the inverter. Audi documents it on the 2021-23 Q5 e quattro (bulletin 2069917/1): P0A5D00, often with P0A6000 and P0A6300, is stored in the electric drive control module J841, the cluster reads Drive system: fault and the car may not start or drive. The cause was variance in welding the high-voltage phase conductors; the fix is a resistance and wiggle test of each phase lead and a new motor harness. Many inverters do not measure U at all: a Hyundai patent measures two phases and calculates the third from the zero-sum rule, so a U fault can also stem from the V or W sensor. P0A5E/P0A5F are the low and high variants, P0A60 and P0A63 phases V and W.

Likely causes

High-voltage phase cable or weld joint to drive motor A faulty (Audi Q5 e quattro)
Phase current sensor in the inverter failed
Internal inverter fault
Winding fault in phase U of drive motor A

Symptoms

  • Drive system fault message and MIL
  • Vehicle does not start or the drive system cannot be activated

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€400–6,000
Time1.5–8 h

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

Parts involved

drive motor a phase uinverter

Related codes

P0A5EP0A5FP0A60P0A63P0A66P0BFD

References: static.nhtsa.gov, patents.google.com, patents.google.com.