P0A67 – Drive Motor “B” Position Sensor Circuit High

P0A67 means the Hybrid/EV Control ECU has detected a **high-voltage condition in the Drive Motor “B” Position Sensor circuit**. Motor “B” is the secondary traction motor used in AWD hybrids and dual-motor EVs. Its resolver or Hall-effect sensor provides precise rotor-angle feedback to the inverter. A “Circuit High” fault indicates an **open circuit, disconnected harness, broken wire, or failed sensor** that causes the signal voltage to float above the expected range. When the ECU loses reliable rotor-angle data, it disables rear-motor torque, reduces power, or may even block READY mode. This guide explains the meaning, causes, diagnosis steps, and repair options for P0A67.

What Does P0A67 Mean?

P0A67 sets when the signal from the Drive Motor “B” position sensor reads **higher than the calibrated threshold**, often due to an open circuit. For resolver systems, an open sine or cosine coil results in missing waveforms or abnormally high, unstable reference signals. For Hall-effect systems, an open circuit produces floating logic levels that the ECU interprets as invalid.

Because the ECU cannot accurately determine the rotor’s orientation, the inverter cannot safely deliver torque. As a safety precaution, the system disables or limits Motor “B” operation and may restrict AWD functionality entirely.

Quick Reference

  • OBD-II Family: P-Code (Hybrid/EV Propulsion)
  • Scope: Generic
  • System: Drive Motor “B” Position Sensor
  • Difficulty Level: High
  • Estimated Repair Cost: €250–€900
  • Last Updated: 2025-11-24

Real-World Example / Field Notes

We’ve seen P0A67 appear most often on Toyota E-Four AWD hybrids, Lexus e-AWD systems, Hyundai/Kia AWD hybrids, and dual-motor EVs like Nissan Leaf e+ and some GM/Voltec platforms. In one Toyota C-HR Hybrid AWD case, a rubbed-through resolver wire on the rear subframe caused an intermittent open circuit—AWD worked at first, then immediately shut off under load. Another case involved a Hyundai Tucson Hybrid where a connector seal failed, allowing moisture to corrode the resolver pins and intermittently open the sensor circuit.

Symptoms of P0A67

  • AWD disabled or reduced: Vehicle may operate in FWD-only mode.
  • Limp mode activation: ECU limits torque output.
  • Hybrid/EV warning messages: “Check AWD System,” “EV System Fault,” or similar.
  • Shuddering or inconsistent torque: Happens briefly before the ECU shuts down Motor “B.”
  • Loss of rear-motor regenerative braking: Rear axle regen contribution disappears.
  • READY mode refusal (severe cases): Occurs if both signal channels are open.
  • Inverter cooling fan running more often: System compensates for unstable signal input.

Common Causes of P0A67

Most Common Causes

  • Open circuit in resolver or Hall sensor wiring.
  • Loose, unplugged, or corroded rear-motor connector.
  • Internally open resolver coil or failed Hall-effect element.
  • Broken shield or conductor inside the harness.
  • Damaged connector pins or seals allowing ingress.

Less Common Causes

  • Faulty inverter signal-processing input channel.
  • Rotor magnet ring damage affecting Hall sensors (rare).
  • Poor grounding between rear motor and vehicle chassis.
  • Incorrect wiring routing after service causing tensile stress or stretching.

Diagnosis: Step-by-Step Guide

Your objective is to locate where the circuit is open — in the wiring, connector, sensor, or inverter input stage.

Tools You’ll Need: EV-safe scan tool, oscilloscope, multimeter, wiring diagrams, insulated gloves, resolver/Hall signal specifications.

  1. Check rotor-angle data with a scan tool. Frozen or missing values indicate signal loss.
  2. Inspect the rear motor connector. Look for corrosion, bent pins, and failed seals.
  3. Perform a harness wiggle test. Sudden data changes point to intermittent opens.
  4. Measure signal voltage. A floating or overly high reading indicates an open circuit.
  5. Scope the resolver waveforms. Missing sine or cosine channels confirm an open resolver coil or wire.
  6. Check continuity across all sensor lines. High resistance or infinite resistance = open circuit.
  7. Inspect cable shielding and routing. Shield breaks introduce noise and instability.
  8. Look for water intrusion in the rear motor housing. Moisture often leads to connector corrosion and open circuits.
  9. Review freeze-frame data. Helps identify if the fault happens under load, regen, or startup.
  10. Verify inverter/motor grounding. Poor grounds destabilize sensor voltage levels.

Pro Tip: Resolver systems should always show perfectly paired sine/cosine waveforms. If one waveform disappears entirely or becomes a high-voltage flat line, you’re dealing with an open circuit—one of the most common causes of P0A67.

Possible Fixes & Repair Costs

  • Repair or replace open wiring in the harness: €40–€200.
  • Clean, reseat, or replace corroded connector pins: €10–€80.
  • Replace Drive Motor “B” resolver/Hall sensor: €250–€450.
  • Fix water intrusion or reseal rear-motor housing: €50–€200.
  • Repair or replace inverter input board (if defective): €400–€900.
  • Replace complete rear motor assembly (rare): €900–€2,500+.

Most high-signal faults originate from open circuits in wiring or connectors—far more common than full motor or inverter failure. Always confirm continuity and waveform integrity before replacing major components.

Can I Still Drive With P0A67?

Driving is possible but limited. AWD will typically be disabled, meaning reduced traction in snow, rain, or gravel. In severe cases, the ECU may block READY mode or shut down rear-motor assistance completely. If the vehicle shudders, loses power, or shows persistent warnings, stop driving and perform diagnosis immediately.

Need wiring diagrams and factory-style repair steps?

Powertrain faults often require exact wiring diagrams, connector pinouts, and guided test steps. A repair manual can help you confirm the cause before replacing parts.

Factory repair manual access for P0A67

Check repair manual access

Compare nearby sensor drive trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • P0A63 – Drive Motor “A” Position Sensor Circuit High
  • P0A9C – Motor Electronics Coolant Temperature Sensor Circuit High
  • P0A6B – Generator Position Sensor Circuit High
  • P0A66 – Drive Motor “B” Position Sensor Circuit Low
  • P0A65 – Drive Motor “B” Position Sensor Circuit Range/Performance
  • P0A64 – Drive Motor “B” Position Sensor Circuit

Key Takeaways

  • P0A67 indicates a high-voltage/open-circuit condition in the Drive Motor “B” position sensor signal.
  • Most failures come from wiring breaks, connector corrosion, or internal sensor opens.
  • AWD may be disabled and the vehicle may lose rear-motor torque or regen.
  • Waveform testing with an oscilloscope is the most accurate diagnostic method.

FAQ

What causes P0A67 most often?

Broken wiring, unplugged connectors, or internally open resolver/Hall sensors are the most common root causes.

Is it safe to drive with P0A67?

You can drive in FWD-only mode, but AWD and rear-motor torque will likely be disabled. Avoid slippery conditions.

How is P0A67 diagnosed?

By checking live data, inspecting connectors, testing continuity, and scoping the resolver or Hall-effect waveforms.

Does P0A67 mean the motor is failing?

Usually no. Wiring and connector issues are far more common than internal motor failures.

Why does the ECU disable AWD with P0A67?

Because the inverter cannot safely control Motor “B” without valid rotor-angle data, so it shuts off torque to prevent damage.