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Home / DTC / P0EB6 — A/C Compressor Motor Phase V Current Sensor Circuit Low

P0EB6 — A/C Compressor Motor Phase V Current Sensor Circuit Low

Detailed page for trouble code P0EB6.

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P0EB6

Generic P — Powertrain

A/C Compressor Motor Phase V Current Sensor Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 19 RU: 10
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Page language: EN

Causes

  • Open or shorted wiring between phase V current sensor and control module/inverter
  • Corroded or loose connector at current sensor or inverter
  • Failed phase V current sensor (Hall sensor or shunt)
  • Faulty inverter / motor controller or PCM power/ground issue
  • Internal compressor motor winding fault or open phase
  • Low battery voltage or blown fuse for the inverter/sensor supply

Symptoms

  • Reduced or no A/C cooling
  • A/C compressor may not engage or cycles on/off
  • Check engine light or A/C warning lamp illuminated
  • Unusual compressor noise or lack of compressor drive
  • Possible limp-home mode for HVAC or limited blower/AC operation

What to check

  • Read and record freeze-frame and live data for all compressor phase current sensors and related parameters
  • Visually inspect wiring, connectors, and harness routing to compressor/inverter for damage or corrosion
  • Verify supply voltage and ground at the inverter and at the current sensor connector(s)
  • Backprobe the sensor connector and monitor voltage with compressor off and while commanded on
  • Check for related DTCs from inverter, motor controller, or CAN network
  • Measure resistance between motor phase terminals (if accessible) and check for open/shorts between phases and to ground

Signal parameters

  • Current sensor signal typically reported to controller as a DC voltage in the 0–5 V range (exact spec depends on manufacturer)
  • Some Hall-effect sensors use a mid-rail quiescent voltage (~2.5 V) and vary up/down with current
  • Expected phase current values shown in live data (amps) when compressor is running; phase V reading should be similar to other phases
  • Sensor reference supply usually 5 V or vehicle battery-derived supply; ground continuity must be steady
  • Controller PID/diagnostic thresholds detect 'low' when sensor output is below a manufacturer-defined limit or outside expected range

Diagnostic algorithm

  1. Use a scan tool: record freeze-frame, live data for all three phase current sensors, and note any other related codes.
  2. Clear the code and attempt to re-create the fault under the same conditions while monitoring live data.
  3. Visual inspection: check connectors and wiring to compressor/inverter for corrosion, damage, pin push-out, or moisture.
  4. Verify power and ground at the inverter and sensor connector(s) with ignition on and compressor commanded on (measure reference voltage and ground resistance).
  5. Backprobe the phase V sensor signal wire. Compare idle/quiescent voltage to manufacturer expected value and to other phase sensor signals.
  6. With technician and safety precautions, command compressor on and observe phase V signal while comparing to phases U and W. Look for low or no change in phase V.
  7. Check continuity/resistance of the phase V signal and return wires to the control module/inverter to rule out opens or shorts to ground/power.
  8. Measure motor phase resistances (if serviceable and safe to do) to detect open winding or shorted turns. Inspect inverter output stages for faults.
  9. If wiring and supply/ground are good but sensor output remains low, replace the current sensor or compressor/inverter assembly per manufacturer procedure, or replace inverter/controller if diagnosed faulty.
  10. After repair, clear codes, perform functional test and road test to ensure code does not return and A/C operation is restored.

Likely causes

  • Damaged wiring harness or chafed insulation shorting to ground on phase V sensor circuit
  • Connector corrosion or poor pin contact at sensor or inverter
  • Failed current sensor inside compressor/inverter assembly
  • Inverter/controller electronics failure
  • Open motor phase winding

Fault status

⚠️ Status
A/C compressor motor phase V current sensor circuit reported low signal — possible open/short in harness, failed sensor, inverter or motor fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0EB4 P0EB5 P0EB7 P0EB8 P0E00
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