P0A0D on Ford
High Voltage System Interlock Circuit High
P0A0D on Ford vehicles indicates high voltage system interlock circuit high. Au7o has documented this code across 1 Ford model — most commonly on Focus. 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. Typical repair costs on Ford range from $600 to $3,000, depending on the specific model and root cause.
Common Causes of P0A0D
- •Open HV interlock loop (disconnected connector or service plug)
- •Broken interlock wire
- •Corroded/damaged pins
- •Control module fault
P0A0D on Ford by Model
Ford Focus(1 issue)
- Focus Electric High-Voltage Battery Contactor Failure - Vehicle Will Not Charge2012-2018
On the battery-electric Focus, the high-voltage pack's main positive and negative contactors (relays) fail - either welding stuck closed or burning their contacts open. When a contactor faults, the on-board charger cannot close the HV circuit, so the car reports a charging fault, refuses to accept AC from either the 120V convenience cord or a 240V EVSE, and may throw HV isolation faults. Owners on the Focus Electric community have traced dead-charge conditions to burnt contactors in the upper pack, sometimes alongside coolant intrusion into the pack, and Ford also issued service information for HV packs that will not charge on the second-generation 120V charge cord.
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View P0A0D across all makes →Frequently Asked Questions
What does P0A0D mean on Ford?▼
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 Ford specifically, this code is documented across 1 model.
What causes P0A0D on Ford vehicles?▼
Common causes on Ford: 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 Ford?▼
Repair costs on Ford range from $600 to $3,000, depending on the specific model and root cause.
Which Ford models have P0A0D documented?▼
Au7o has documented P0A0D on 1 Ford model: Focus.