BYD ATTO 3 / Yuan Plus P1A0000 P1A0100 HV Leakage & Insulation Fault OEM Diagnostic Guide

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Diagnose P1A0000 Severe Leakage Fault and P1A0100 General Leakage Fault using the OEM diagnostic procedure for identifying the source of a high-voltage leakage or low-insulation condition.

Years Covered:
2022, 2023, 2024, 2025

Vehicle Specification:
SC2E, e-Platform 3.0 400V, FWD, RHD

Excludes:
2026+ BYD ATTO 3 Evo, 800V RWD/AWD architecture, 74.8 kWh Cell-to-Body battery pack, and Left-Hand Drive (LHD) variants.

DTCs Covered

• P1A0000 — Severe Leakage Fault — fault trigger below 100 Ω/V
• P1A0100 — General Leakage Fault — fault trigger below 500 Ω/V

Diagnostic Coverage

• OEM safety and electrical precautions
• Diagnostic prerequisites and test conditions
• Connector and intermittent-fault guidance
• P1A0000/P1A0100 DTC confirmation and fault-code recheck
• Battery execution and sampling unit software check
• Power battery pack insulation-resistance test
• P1A0000 100 Ω/V battery insulation criterion
• P1A0100 500 Ω/V battery insulation criterion
• Electric compressor insulation-resistance test
• AC/DC integrated charging vehicle socket insulation-resistance test
• Integrated intelligent front-drive controller insulation-resistance test
• Drive motor assembly insulation-resistance test
• > 2 MΩ component insulation pass criteria
• OEM pass/fail specifications
• Guided diagnostic decision sequence
• OEM-directed action for each failed test