Powertrain, generic · Hybrid propulsion

P0A7A Generator Inverter Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A7A reports that the inverter stage driving the generator has signalled a fault, for example overcurrent or a failed power switch. Toyota uses the code across its hybrids and splits it with information codes. Bulletin T-SB-0142-16 covers 2012-2016 Avalon, Camry and RAV4 Hybrid with MIL on and P0A7A plus information code 122, a generator inverter fail signal caused by overcurrent; the repair replaces inverter and transaxle. A Toyota field report filed with NHTSA describes a 2006 Highlander Hybrid with P0A7A sub code 325, master warning, MIL and Check Hybrid System, traced to a fault inside the inverter assembly. P0A78 and P0A79 are the drive motor inverters, P0A3E generator inverter overheating, P0A92 generator performance.

Likely causes

Internal generator inverter fault with overcurrent (Toyota information code 122)
Inverter assembly defective
Fault in the generator inside the transaxle
Insufficient inverter cooling stressing the power stage

Symptoms

  • MIL, master warning and Check Hybrid System message
  • Reduced power or vehicle will not enter ready mode

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€1,000–8,000
Time2–10 h

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

Parts involved

generator inverterhybrid control module

Related codes

P0A78P0A79P0A3EP0A92P0A4B

References: static.nhtsa.gov, static.nhtsa.gov.