Code
P0DF5
Generic
P — Powertrain
Generator Inverter Temperature Sensor B Circuit Low
Views:
UK: 21
EN: 28
RU: 17
AI status
Completed
Completed
100%
Causes
- Short to ground in the sensor signal circuit
- Failed or shorted temperature sensor (thermistor)
- Poor or corroded connector or pin at sensor or inverter control module
- Damaged wiring or chafing in harness
- Loss of reference voltage from inverter control module
- Water intrusion or contamination at connector
Symptoms
- Malfunction Indicator Lamp (MIL) or hybrid/inverter warning light illuminated
- Possible inverter/charging system derate or limp mode
- Reduced regenerative braking or charge capability
- Stored inverter/hybrid system faults and reduced performance
- Noisy or intermittent fault depending on harness movement
What to check
- Read and record freeze frame and all related codes with a scan tool
- Perform a visual inspection of the sensor, connector, and wiring for damage, corrosion, or water ingress
- Check for obvious wiring chafing where harness passes near chassis or hot components
- Backprobe the sensor connector and measure signal and reference voltages with ignition on (follow safety procedures for HV systems)
- Measure resistance of the sensor (with it disconnected) and compare to expected thermistor resistance vs temperature if available
- Perform wiggle test on harness and connector while monitoring live data/voltage
Signal parameters
- Typical reference voltage: ~5 V (consult vehicle manual)
- Expected signal: thermistor-based voltage that varies with temperature (typical 0.1–4.9 V range)
- Low-circuit trigger: signal voltage well below normal range (often
- Sensor is usually NTC — resistance decreases as temperature rises (consult OEM chart for exact ohms vs °C)
Diagnostic algorithm
- Retrieve DTCs and freeze-frame data; note conditions when fault set.
- Disconnect high-voltage system per manufacturer procedure and take required safety precautions before working on inverter wiring or connectors.
- Visually inspect sensor harness and connectors for damage, corrosion, or moisture. Repair any damage.
- With ignition on (and HV system made safe per service manual), backprobe sensor connector: verify reference voltage present and measure signal voltage. If reference missing, suspect inverter control module or power supply circuit.
- If reference present and signal is low, disconnect sensor and measure sensor resistance at ambient temperature. Compare to OEM resistance vs temperature chart. If resistance indicates short/very low resistance, replace sensor.
- If sensor resistance normal, check continuity of signal wire to inverter control module and check for short to ground (ohmmeter). Repair open/shorts as required.
- After repairs, clear codes and perform road/operation test to confirm DTC does not return. If wiring and sensor are good but problem persists, consider inverter control module internal fault and follow OEM procedures for module diagnosis or replacement.
Likely causes
- Sensor signal shorted to ground
- Corroded/loose connector at sensor or inverter
- Damaged wiring between sensor and inverter control module
Fault status
Status
Generator inverter temperature sensor B circuit low — signal voltage below expected range (possible short to ground or sensor failure).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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