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Home / DTC / P0EB1 — A/C Compressor Motor Phase U Current Sensor Circuit

P0EB1 — A/C Compressor Motor Phase U Current Sensor Circuit

Detailed page for trouble code P0EB1.

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P0EB1

Generic P — Powertrain

A/C Compressor Motor Phase U Current Sensor Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 10 EN: 17 RU: 10
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Page language: EN

Causes

  • Open or short in the Phase U current sensor wiring or connector
  • Corroded or loose connector at sensor, inverter, or ECU
  • Failed Phase U current sensor (internal fault)
  • Faulty inverter / motor drive electronics
  • High current draw from the compressor motor (locked rotor, bearing seizure)
  • Intermittent connection or wiring chafing

Symptoms

  • Reduced or no A/C cooling (compressor disabled)
  • A/C system enters limp or fail-safe mode
  • Malfunction indicator lamp (MIL) or A/C warning lamp illuminated
  • Stored fault code(s) for compressor current sensor or inverter
  • Intermittent A/C operation or loss of compressor torque
  • Unusual noise from compressor/inverter if mechanical bind present

What to check

  • Read and record freeze-frame and live data with a scan tool (Phase U current and other phase values)
  • Visually inspect compressor, inverter, and harness for damage, heat, or corrosion
  • Check connector locks and pins for corrosion, deformation, or looseness
  • Measure sensor signal voltage at connector (backprobe) with engine/A/C system in the required state
  • Compare Phase U sensor reading to Phase V/W (other phases) for imbalance
  • Check fuses, contactors/relays and main power feeds to inverter/compressor

Signal parameters

  • Current sensor provides a voltage proportional to motor phase current (typical 0–5 V analog output or CAN/inverter message depending on design)
  • With no motor current expected, sensor output commonly rests near mid-scale (e.g., ~2.5 V for bidirectional sensors) — consult vehicle-specific data
  • Short to ground: output near 0 V; short to battery: output near 5 V; open: out-of-range or no signal
  • Expected relative balance: phase U reading should be similar to the other motor phase current readings under the same load
  • Signal frequency/content: may be DC/slow-varying analog for RMS current or modulated waveform — use oscilloscope for waveform verification

Diagnostic algorithm

  1. Retrieve all related DTCs, freeze-frame data and live-phase current data with a diagnostic scan tool. Note conditions when fault stored.
  2. Clear codes and attempt to re-create the fault while monitoring Phase U and the other phase currents. Look for intermittent behavior.
  3. Visually inspect wiring, harness routing and connectors between the inverter, current sensor and ECU for damage, corrosion or heat exposure. Secure connectors and repair visible damage.
  4. Backprobe the Phase U sensor signal, reference and ground at the connector. Verify expected voltages (refer to vehicle-specific values).
  5. If available, use an oscilloscope to observe the sensor waveform while commanding compressor on/off. Compare Phase U waveform to other phases for anomalies.
  6. Perform continuity/resistance checks on wiring with power removed to detect opens or shorts to ground/battery. Repair any wiring faults.
  7. Check compressor motor phase-to-phase resistance for signs of shorted windings or locked rotor (follow HV safety procedures).
  8. Inspect and test the inverter output stage and its supply/grounds. Replace inverter or current sensor only after isolating the defective component.
  9. If wiring and sensor check good but fault persists, follow manufacturer procedures to test/replace the inverter module or compressor motor assembly.
  10. After repairs, clear codes and perform functional test under normal operating conditions to verify the issue is resolved.

Likely causes

  • Damaged wiring harness to the compressor/inverter (chafe, rodent, heat)
  • Contaminated or corroded connector at the sensor or inverter
  • Failed Hall-effect or shunt-based current sensor inside the inverter
  • Inverter power stage or control electronics fault causing incorrect sensor feedback
  • Mechanical seizure or excessive load on the A/C compressor motor causing abnormal current

Fault status

⚠️ Status
A/C compressor motor Phase U current sensor circuit fault detected — signal out of range or implausible. Compressor/inverter may be disabled.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-3 hours

Similar codes

P0EB0 P0EB2 P0EB3 P0EA0 P0E9F
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