P0BDB

Code

Generic P — Powertrain

Drive Motor Inverter Temperature Sensor E Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 30 RU: 26

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Page language: EN

Causes

Open or short in temperature sensor E wiring
Corroded, loose or damaged connector at sensor or inverter
Failed temperature sensor (thermistor) inside the inverter assembly
Poor ground or supply reference for the sensor circuit
Faulty inverter control module or ECU input for that sensor
Water intrusion, contamination, or physical damage to inverter

Symptoms

MIL/Warning lamp may illuminate
Possible reduced drive performance, limp-home or derate mode
Inverter cooling fans may run continuously or abnormally
Incorrect or no temperature reading for inverter in vehicle data
Intermittent faults or codes after vibration or moisture exposure

What to check

Read freeze frame and live data for inverter temperature sensor E
Visually inspect connectors, pins and wiring at inverter and harness
Check for DTCs related to other inverter sensors or communications
Measure sensor circuit voltage and resistance at the harness connector
Check reference voltage and ground at sensor circuit
Inspect inverter for signs of water entry, burns or mechanical damage

Signal parameters

Typical sensor type: thermistor (NTC/Pt) — resistance varies with temperature
Expected signal voltage range (typical): ~0.1–4.9 V depending on temperature and design
Open-circuit indication: voltage pegged near supply or very high/low reading depending on circuit
Short-circuit indication: sensor voltage near 0 V or supply rail (depends on wiring)
Expected operating temperature range: varies by vehicle — compare live data to ambient

Diagnostic algorithm

Retrieve and record DTC and related codes. Note freeze-frame and live data for sensor E.
Inspect harness and connector for corrosion, damage, looseness, or water ingress. Repair or clean as needed.
With ignition on (follow manufacturer safety), measure reference voltage and ground at the sensor connector; compare to specification or other inverter sensor circuits.
Backprobe sensor signal pin and record voltage while monitoring live data as ambient/inverter temperature changes (warm up or cool down).
Measure sensor resistance at the connector (with sensor disconnected) and compare to expected resistance vs temperature curve if available. Check for open or short.
Check continuity between sensor connector and ECU/inverter connector; repair any high-resistance or open circuits.
If wiring and connectors good, replace the inverter temperature sensor or inverter assembly per manufacturer procedure and retest.
If replacing parts, clear codes, perform functional test and road test; verify code does not return and temperature readings behave normally.
If fault persists after sensor/inverter replacement, suspect ECU/input circuit or internal module failure — consult manufacturer support.

Likely causes

Connector corrosion or pin damage at inverter sensor harness
Broken or chafed wiring in harness routing to inverter
Failed inverter temperature sensor (thermistor) element
Poor sensor ground or reference voltage fault
Internal inverter electronics fault

Fault status

⚠️ Status

DTC stored for Drive Motor Inverter Temperature Sensor E Circuit. MIL/Warning may be illuminated. ECU may limit inverter output or enter reduced performance mode until fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours