Powertrain, generic · Hybrid propulsion

P0A63 Drive Motor A Phase W Current

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A63 concerns the current in phase W of drive motor A. In the Toyota field reports filed with NHTSA it always appears beside P0A60: on a 2006 Highlander Hybrid with sub code 502, after P0A60 sub code 501, together with P0A78 and P0AEF, master warning on and no drive; the inverter assembly was replaced. These Toyota reports name only V and W, for the motor and for the generator (P0A72, P0A75), which fits a design where two phase currents are measured and U follows from the rule that all three add up to zero, as a Hyundai patent describes. Audi stores P0A6300 in module J841 of the 2021-23 Q5 e quattro when the welded high-voltage phase lead fails. P0A64/P0A65 are low and high, P0A5D and P0A60 phases U and V.

Likely causes

Internal fault in the inverter assembly (Toyota Highlander Hybrid)
High-voltage phase W cable or weld joint faulty (Audi Q5 e quattro)
Phase W current sensor failed

Symptoms

  • Master warning or drive system fault message, MIL
  • Vehicle will not move or start

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 winverter

Related codes

P0A64P0A65P0A5DP0A60P0A75P0A78

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