P0A94 on Toyota
DC/DC Converter Performance
P0A94 on Toyota vehicles indicates dc/dc converter performance. Au7o has documented this code across 1 Toyota model — most commonly on Highlander. This hybrid/electric vehicle code sets when the hybrid control system detects that the DC/DC converter is not performing within expected parameters. The DC/DC converter steps the high-voltage battery power down to the 12-volt level that runs the car's lights, accessories, and control modules, so a performance fault can affect the whole low-voltage system. Symptoms may include warning lights, reduced power, the hybrid system not starting, or a discharged 12-volt battery. Because high-voltage components are involved, diagnosis and repair should be done by a qualified hybrid technician. Typical repair costs on Toyota range from $700 to $1,100, depending on the specific model and root cause.
Common Causes of P0A94
- •Faulty inverter/converter assembly (DC/DC converter)
- •Open or shorted wiring in the converter circuit
- •Poor electrical connection at the converter
- •Weak or failing 12-volt battery
- •High-voltage system or cooling fault affecting the converter
- •Software/control module calibration issue
- •Faulty hybrid control module (less common)
P0A94 on Toyota by Model
Toyota Highlander(1 issue)
- Hybrid Inverter Coolant Pump Failure (Inverter Overheat) — P0A05 / P0A932006-2019
The Highlander Hybrid uses a dedicated electric water pump to circulate coolant through the power inverter/converter, which runs separately from the engine cooling system. The electric pump wears out and stops circulating coolant, allowing the inverter and hybrid electronics to overheat. Failures often present with little warning beyond a check engine light and hybrid warning lights; if ignored, the inverter itself (a far more expensive component) can be damaged. Owners report this most on the 2006-2010 generation but it recurs across later hybrids.
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View P0A94 across all makes →Frequently Asked Questions
What does P0A94 mean on Toyota?▼
P0A94 stands for "DC/DC Converter Performance." This hybrid/electric vehicle code sets when the hybrid control system detects that the DC/DC converter is not performing within expected parameters. The DC/DC converter steps the high-voltage battery power down to the 12-volt level that runs the car's lights, accessories, and control modules, so a performance fault can affect the whole low-voltage system. Symptoms may include warning lights, reduced power, the hybrid system not starting, or a discharged 12-volt battery. Because high-voltage components are involved, diagnosis and repair should be done by a qualified hybrid technician. On Toyota specifically, this code is documented across 1 model.
What causes P0A94 on Toyota vehicles?▼
Common causes on Toyota: Faulty inverter/converter assembly (DC/DC converter), Open or shorted wiring in the converter circuit, Poor electrical connection at the converter, Weak or failing 12-volt battery, High-voltage system or cooling fault affecting the converter. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0A94 on a Toyota?▼
Repair costs on Toyota range from $700 to $1,100, depending on the specific model and root cause.
Which Toyota models have P0A94 documented?▼
Au7o has documented P0A94 on 1 Toyota model: Highlander.