P0DF1 — Generator Inverter Temperature Sensor B Circuit Intermittent/Erratic

Diagnostic algorithm

1. Safety first — follow vehicle-specific high-voltage/inverter safety procedures. Disable high-voltage system and place vehicle in service mode if required before accessing the inverter area.
2. Connect a capable scan tool and record live data for inverter temperature sensor B. Note behavior at key on, idle and during a short drive if safe.
3. Inspect connector and wiring to the sensor. Look for corrosion, bent pins, water ingress, crushed cables, or heat damage.
4. Perform a wiggle test: with live data displayed, gently move harness and connectors to try to reproduce the erratic signal. If the code or fluctuation appears, isolate the harness section.
5. With high-voltage system disabled (if required), disconnect the sensor and measure resistance between sensor terminals. Compare to manufacturer spec or compare A vs B sensors if possible. Check for open/short conditions.
6. Backprobe connector with ignition on (if safe and allowed) and measure sensor supply/reference and ground. Confirm stable reference voltage and good ground continuity.
7. If wiring and connector are suspect, repair or replace damaged sections and retest. Use proper sealing and routing away from heat or moving parts.
8. If wiring checks good and sensor resistance/response is out of spec or intermittent, replace sensor and retest.
9. If sensor and wiring test OK but intermittent signal persists, suspect inverter control module input; inspect module grounds and power feeds. Consider module bench or dealer-level diagnostics.
10. Clear codes, perform functional tests and a road test monitoring live data to confirm repair. If code returns, capture freeze frame and waveform for next-level diagnosis or manufacturer support.