The Problem
Shop received a 2024 Tesla Model 3 Highland (RWD) with customer complaint of Level 2 charging failure at home wallbox and public J1772 stations. DC Supercharging worked normally. Vehicle displayed 'Charging Equipment Not Compatible' message despite using a known-good EVSE. No dashboard warning lights. DTC P0D35 (On-Board Charger AC Input Phase Loss Detected) retrieved via third-party scan tool.
Diagnostic Procedure
-
1
Verify P0D35 active via scan tool — check for co-stored faults (U-codes, contactor faults, CP signal faults)
-
2
Test EVSE output voltage: measure L1 and L2 at J1772 handle during connection attempt (should read 240V L-L, 120V L-N)
-
3
Measure AC input voltage at charge port pins 1 and 2 while EVSE connected — if voltage present at port but absent at OBC input, suspect charge port wiring
-
4
Check proximity pilot (PP) resistance at charge port: should be ~150 ohm for valid J1772 connection
-
5
Verify Control Pilot (CP) waveform with oscilloscope: +/-12V PWM at 1kHz from EVSE
-
6
Inspect OBC AC input connector X125 after HV shutdown: check for corrosion, heat discoloration, terminal damage
-
7
Measure OBC AC input resistance across L1-L2 with HV disconnected: normal >100 kohm; shorted X-capacitor shows <1 ohm
-
8
Confirm DC charging bypasses OBC entirely — this isolates fault to AC input circuit
Resolution & Root Cause
X-capacitor failure on OBC AC input confirmed: 0.3 ohm measured across L1-L2 OBC input (normal >100 kohm). OBC assembly replaced with factory unit. P0D35 cleared, Level 2 AC charging fully restored. DC Supercharging had remained operational throughout because it bypasses the onboard charger via direct DC contactors.
💡 Key Lesson
On 2024 Tesla Model 3 Highland, P0D35 combined with DC charging remaining functional almost always indicates OBC-side failure rather than charge port or EVSE issue. The 11.5kW OBC uses X-capacitors on the AC input stage that can fail in high-humidity environments. Always verify DC charging first — if Supercharging works, charge port, HV contactors and BMS are intact. Fault is isolated to the OBC AC input circuit.
About This Case
This case was solved remotely by an HVDesk specialist with 15+ years of hands-on experience across major EV platforms including Tesla, Hyundai/Kia, Volkswagen ID series, BMW i-series, and Ford EVs. The procedure was provided as structured remote support to an independent auto repair shop.
