P0A0D on Mercedes-Benz
High Voltage System Interlock Circuit High
P0A0D on Mercedes-Benz vehicles indicates high voltage system interlock circuit high. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on EQS. The high-voltage interlock circuit voltage is high (typically an open in the HVIL loop). An open interlock causes the HV system to disable for safety.
Common Causes of P0A0D
- •Open HV interlock loop (disconnected connector or service plug)
- •Broken interlock wire
- •Corroded/damaged pins
- •Control module fault
P0A0D on Mercedes-Benz by Model
Mercedes-Benz EQS(1 issue)
- Recurring 'Battery Malfunction / Do Not Tow' Warning and Front Motor Interlock Faults2022-2024
Many EQS and EQS SUV owners report frequent 'Battery Malfunction' and 'Malfunction - Towing is not permitted' (Do Not Tow) dashboard messages, in some cases once or twice a month during the first 20,000 miles. The message appears to be a catch-all for several underlying conditions. In milder cases the car still drives and the warning self-clears or resolves with an ignition/12V reset; in severe cases the car refuses to shift into Drive, Neutral or Reverse and is immobilized. A subset of these events trace to a front electric motor 'interlock' fault that prevented the car from being put in Park and required Mercedes to replace the front electric drive motor under warranty. Owners frequently note multiple dealer visits and long parts waits before resolution.
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View P0A0D across all makes →Frequently Asked Questions
What does P0A0D mean on Mercedes-Benz?▼
P0A0D stands for "High Voltage System Interlock Circuit High." The high-voltage interlock circuit voltage is high (typically an open in the HVIL loop). An open interlock causes the HV system to disable for safety. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0A0D on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Open HV interlock loop (disconnected connector or service plug), Broken interlock wire, Corroded/damaged pins, Control module fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0A0D on a Mercedes-Benz?▼
Repair costs vary widely depending on the root cause and specific Mercedes-Benz model.
Which Mercedes-Benz models have P0A0D documented?▼
Au7o has documented P0A0D on 1 Mercedes-Benz model: EQS.