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DTC codes / P0Exx · Hybrid propulsion / P0E2B

P0E2BDrive Motor Inverter Temperature Sensor H Circuit High

P0E2B indicates that the powertrain control module has detected an abnormally high voltage on the signal circuit for the 'H' temperature sensor that monitors the drive motor inverter. This sensor reports inverter temperature, and a high-voltage condition on its signal circuit typically means the circuit is open, shorted to voltage, or the sensor's internal resistance has shifted outside the expected range.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message, often with no other noticeable symptoms.
  • Reduced power output or limp-home mode as the inverter controller derates to protect the hardware.
  • Intermittent or complete loss of electric drive propulsion, depending on how the controller reacts to the implausible temperature reading.
  • A stored over-temperature or sensor-circuit fault in the inverter control module that may trigger additional warning lamps.
  • In some vehicles, the cooling fan may run continuously or the cabin climate control may behave erratically as the controller attempts to manage inverter temperature.
  • No drivability change at all if the fault is a brief intermittent signal spike that has since corrected itself.

Common causes, most likely first

  1. An open or high-resistance connection in the sensor signal circuit, often at a corroded or loose connector terminal.
  2. A short to voltage on the signal wire, which can be caused by chafed insulation rubbing against a power feed or a faulty sensor internally shorting to its supply.
  3. A failed inverter temperature sensor whose resistance has drifted high, sending an out-of-range voltage to the controller.
  4. A poor ground connection at the sensor or controller, which raises the reference voltage seen on the signal circuit.
  5. Damage to the wiring harness from heat, vibration, or rodent activity in the inverter area.
  6. A fault inside the inverter control module itself, such as a failed signal-conditioning circuit, though this is less common than wiring issues.
  7. Coolant or oil contamination at the sensor connector causing increased resistance and a high signal voltage.

How to diagnose and fix it

  1. Connect a scan tool and record the freeze-frame data for P0E2B, then clear the code and verify whether it returns immediately or only after a drive cycle.
  2. Visually inspect the inverter temperature sensor connector and the harness routing for corrosion, loose pins, chafing, or heat damage, and repair any obvious wiring faults.
  3. Measure the sensor's resistance with a multimeter and compare it to the manufacturer's temperature-resistance chart to confirm whether the sensor itself is out of specification.
  4. Back-probe the signal circuit at the controller connector with the key on and sensor connected, checking for a voltage that is higher than the specified range for the current temperature.
  5. Perform a voltage-drop test on the sensor ground circuit and the signal circuit to rule out excessive resistance that would skew the reading.
  6. If the wiring and sensor test good, substitute a known-good sensor or use a signal generator to simulate the correct voltage and see whether the code changes, isolating the controller as the fault.
  7. Replace the faulty sensor or repair the harness as needed, clear the codes, and complete a road test with the scan tool monitoring inverter temperature to confirm the repair.

What a high inverter sensor signal really means

  • A high signal voltage on a temperature sensor circuit almost always points to an open circuit or a sensor with increased resistance, not necessarily a failed sensor, so wiring checks should come before parts replacement.
  • The 'H' in the code refers to a second or redundant temperature sensor in some inverter designs, and technicians sometimes replace the primary sensor by mistake when the fault actually lies with the secondary sensor circuit.
  • Inverter temperature sensors are often thermistors, so a high signal voltage can be caused by a sensor that is unplugged or has a broken internal connection rather than one that is reading hot.
  • This code can be set by a momentary voltage spike from a poor ground elsewhere in the vehicle, so checking for other unrelated electrical faults or low battery voltage is worthwhile before condemning the inverter.
  • Some vehicles will not allow the inverter to enter full power mode while P0E2B is active, even if the temperature reading appears normal on the scan tool, because the controller cannot trust the sensor signal.

Can I keep driving with P0E2B?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration, sustained high-speed driving, or towing because the inverter may be running without reliable temperature protection. If the vehicle enters limp mode or shows a red warning, stop driving and arrange a tow.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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