THE BLUE FEETAudi RS e-tron GT losing power on track — and the five-figure battery it never needed
On a hard lap the car suddenly cuts to a fraction of its power, then recovers after a cool-down. The dealer reading pointed at the high-voltage battery — a five-figure replacement the owner was about to authorise.
What the diagnosis found
The platform compared the derate timing against inverter and coolant temperatures rather than state of charge, and found the rear power inverter hitting its thermal limit first — a marginal, air-locked coolant circuit to the inverter was throttling the car, not the pack. The expensive battery was healthy.
Ranked probable causes
How the system reasoned
A power cut that tracks heat and recovers on cool-down is a thermal-protection event — the only question is which component overheats first. By correlating the derate with inverter temperature instead of state of charge, the platform put the inverter, not the costly battery, in the frame and saved a needless five-figure replacement.
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