P0E93

Code

Generic P — Powertrain

Drive Motor B Inverter Voltage Sensor B” Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 33 RU: 23

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Page language: EN

Causes

Short to ground in the inverter voltage sensor B signal circuit
Open or high-resistance connection in signal or return wiring
Corroded, loose or damaged connector at inverter or control module
Faulty inverter voltage sensor (internal resistor divider or sensing electronics)
Inverter internal fault (sensor input stage failure)
Low or missing reference/ground for the sensor circuit

Symptoms

Malfunction Indicator Lamp (MIL) or EV system warning lamp illuminated
Reduced propulsion power or limp-home mode
Drive motor/inverter fault messages or reduced torque available
Vehicle may not accelerate normally or may refuse to drive
Possible loss of regenerative braking or other inverter-related functions

What to check

Read and record all related DTCs and freeze frame data with a capable scan tool
Visual inspection of inverter B connectors, wiring harness, and protective routing
Check for corrosion, bent pins, damaged insulation, and proper connector engagement
Verify fuses/relays/contactor state related to inverter power and precharge
Back-probe the sensor signal and ground with ignition ON (no drive) and measure voltage
Measure continuity and resistance between sensor signal and module/inverter terminals (check for shorts to ground or 12V)

Signal parameters

Signal type: DC analog voltage proportional to inverter DC bus voltage (sensor divider output)
Expected controller-level voltage: typically 0–5.0 V (scaled to high-voltage DC bus); should be a stable DC value, not switching
Fault condition: voltage significantly lower than expected (near 0 V) or intermittent dropouts
Reference/ground: solid ground reference required; open or high resistance ground will pull voltage low
Oscilloscope: steady flat DC trace corresponding to pack voltage scaled; excessive noise or dropouts indicate wiring/sensor/inverter issues

Diagnostic algorithm

Connect a scan tool and record P0E93 plus any related codes and freeze-frame data. Note conditions (ignition state, vehicle speed, pack voltage).
Visual inspection: check inverter B connectors, harness routing, signs of heat or mechanical damage. Repair connector or wiring damage before further testing.
With vehicle safe and high-voltage system disabled per manufacturer procedures, disconnect inverter connector and inspect pins for corrosion, damage or pushing-back pins.
With HV system disabled and key ON per procedures, measure continuity between the sensor signal pin and the inverter/control module terminal to confirm wiring integrity; check for shorts to ground or +12 V.
With HV system enabled only as allowed by OEM safe procedure, back-probe the sensor signal and ground at the inverter/control module connector. Verify the voltage is within expected 0–5 V scaled range. If voltage is near 0 V, suspect short/ground or failed sensor.
If wiring checks good but voltage wrong, swap or replace the inverter voltage sensor (or inverter assembly if sensor is integral) and re-test. Follow manufacturer replacement and safety procedures for high-voltage components.
If replacement does not clear code, perform inverter bench diagnostics per service manual or consult OEM for internal inverter faults and possible module replacement or reprogramming.
After repairs, clear codes and perform a road/functional test to confirm the fault does not return and normal drive functionality is restored.

Likely causes

Damaged connector or pin (corrosion, bent pin) at inverter harness
Short to ground on the sensor signal wire
Failed inverter voltage sensor or internal resistor divider
Loose or missing sensor ground or reference
Inverter internal electronics failure

Fault status

⚠️ Status

Drive Motor B Inverter Voltage Sensor B Circuit Low — voltage-sensing circuit for inverter B is reporting lower-than-expected voltage. Possible short to ground, open circuit, sensor or inverter fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours