P0A94 on Audi: How to Diagnose & Fix
DC/DC Converter Performance
1 Audi model · 1 documented issue · 1 critical
P0A94 on Audi by model: symptoms, diagnosis and fix
NHTSA campaign 25V125 / Audi 93FR covers certain 2024-2025 Q4 e-tron and Q4 e-tron Sportback vehicles. The on-board charger can fail and stop charging the 12-volt battery, which can lead to loss of drive power and increase crash risk. Eligibility is VIN-specific; this does not support the former universal sensor, relay, battery or software-glitch diagnosis.
Common Symptoms
- Electrical-system warning
- 12-volt battery is no longer charged
- Loss of drive power
How to Fix
Check the VIN and campaign-completion history with Audi or NHTSA. The free remedy replaces the on-board charger. If the vehicle warns of an electrical-system fault or loses drive power, move out of traffic safely and arrange Audi recovery/inspection; do not buy a 12-volt battery or generic electrical parts from this summary.
Sources for this issue (1)
P0A94 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0A94 mean on a Audi?
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 Audi it is documented across 1 model: Q4 e-tron.
What are the most common causes of P0A94?
The most common causes of P0A94 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0A94 on a Audi?
Repair costs vary widely with the root cause and Audi model; each issue on this page carries its own estimate where one is published.
Looking for P0A94 on a different make?
View P0A94 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.