P0E29

Code

Generic P — Powertrain

Drive Motor Inverter Temperature Sensor H Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 28 RU: 21

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Page language: EN

Causes

Open or short in the temperature sensor H wiring (to battery voltage or ground)
Poor or corroded connector at the sensor or inverter harness
Faulty drive motor inverter temperature sensor H (thermistor or temperature sender)
Intermittent connection from vibration or damaged insulation
Inverter module internal fault or poor ground
ECU/inverter control module fault or software/calibration error

Symptoms

Malfunction Indicator Lamp (MIL) or warning light illuminated
Inverter/drive system warning or reduced power / limp mode
Cooling fans or inverter cooling system running continuously
Inconsistent or implausible inverter temperature on scan tool
Possible reduced regenerative braking or torque limits

What to check

Read DTCs and freeze-frame/live data with a capable scan tool; note temperature readings and conditions when code set
Visually inspect sensor connector, wiring harness and inverter connector for damage, corrosion, pins pushed out or water intrusion
Wiggle test wiring while monitoring live data to reproduce fault or find intermittent connections
Measure sensor circuit voltage and resistance with a digital multimeter (backprobe connector if needed)
Check for short to battery voltage or ground and continuity to the inverter/ECU connector
Compare sensor reading to ambient or coolant/inverter temperatures and other temperature sensors for plausibility

Signal parameters

Sensor supply/reference: typically 5 V reference from inverter/ECU (verify OEM spec)
Expected sensor output: typically a 0.1–5.0 V analog signal (varies by manufacturer)
Thermistor behavior: NTC-type decreases resistance as temperature rises (or PTC increases if used) — check OEM curve
Resistance at typical ambient temps varies by sensor design — obtain manufacturer chart for exact Ω-vs-°C values
Look for steady, smooth voltage change with temperature; rapid jumps, stuck values, or 0 V/OVB indicate fault

Diagnostic algorithm

Retrieve freeze-frame data and confirm P0E29 presence and other related codes. Record inverter temp reading and conditions (vehicle state, ambient).
Perform a visual inspection of the inverter, sensor mounting area and wiring harness. Repair obvious damage and re-test.
With ignition on (follow vehicle-specific safety procedures), monitor live inverter temp sensor H signal on scan tool while varying temperature or using a heat source (cautiously) to watch for smooth response.
Measure sensor connector pin voltages: verify reference voltage present and good ground. If no reference, suspect ECU/inverter output or wiring.
Measure sensor resistance (with connector disconnected) and compare to OEM spec/expected NTC curve. If resistance out of range at known ambient temp, replace sensor.
Check continuity and shorts in wiring between the sensor and inverter/ECU. Repair any open circuits, shorts, or corroded connectors.
If wiring and sensor check good, perform module input circuit checks per service manual (oscilloscope if required) and consider inverter module replacement or reprogramming if internal input circuit failure is confirmed.
After repairs, clear codes and perform drive/operate cycle to confirm the code does not return and temperature readings behave normally.

Likely causes

Damaged wiring or connector (open, short, corroded pins)
Failed temperature sensor (internal short/open or out-of-spec thermistor)
Intermittent connector contact due to moisture or damage
Inverter electronics fault (sensor input circuit)

Fault status

⚠️ Status

Drive Motor Inverter Temperature Sensor H circuit reading out of expected range or performance. Possible sensor, wiring, or inverter input fault detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours