P0A67 — Drive Motor "B" Phase U Current Low

OBD2 code P0A67 flags a problem with the sensor and actuator circuits (drive motor "B" phase u current low). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P0A67 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the drive motor "B" phase u current low for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P0A67 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P0A67 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Repair wiring or connectors: $80–$250; Replace the faulty sensor or actuator: $150–$500. Overall, fixing P0A67 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How much does it cost to fix P0A67?

Control module repair — $300–$1,000; Repair wiring or connectors — $80–$250; Replace the faulty sensor or actuator — $150–$500. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Will P0A67 clear itself?

Sometimes P0A67 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

Is it safe to drive with P0A67?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How do I diagnose P0A67 myself?

Start with a scan: confirm P0A67, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What is the most common cause of P0A67?

The most common causes are: open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.

When your OBD2 scanner pulls code P0A67, it means the vehicle's control module has detected that the electrical current flowing through one phase of the hybrid or electric drive motor is running lower than expected. Specifically, this fault targets the "U" phase of Motor B — one of the three-phase windings responsible for generating the rotating magnetic field that makes the motor spin. The module constantly monitors how much current each phase draws; when that reading drops below the factory-calibrated threshold, P0A67 triggers and the system logs the failure.

The drive motor in a hybrid or full-EV operates through precise timing of three separate electrical phases, labeled U, V, and W. The inverter module switches high-voltage battery power on and off extremely rapidly to create this three-phase alternating current. Each phase must carry the right amount of current for smooth, efficient operation. When one phase — in this case the U phase of the secondary drive motor — shows abnormally low current, the inverter can no longer maintain proper torque output from that motor. The powertrain control module sets P0A67 because it recognizes this deviation as a fault that affects drivability and could potentially damage other components if ignored.

P0A67 falls under the powertrain category in the OBD2 standard, meaning it relates to the engine, transmission, or hybrid drivetrain systems. The control module typically requires the fault to appear across multiple drive cycles before activating the Check Engine light, though some manufacturers will illuminate it immediately on the first occurrence. The stored freeze-frame data captures operating conditions at the moment of failure — engine speed, vehicle load, temperature readings, and speed — which proves invaluable when tracing intermittent problems back to their root cause.

Common Symptoms

The Check Engine light or hybrid system warning illuminates on the dashboard
Motor B may operate intermittently or fail to provide assistance during acceleration
Reduced hybrid/electric drive capability — the vehicle relies more heavily on the internal combustion engine
In some configurations, the system enters limp-home mode with limited power available
Fuel economy may decrease as the engine compensates for the non-functional electric motor
In rare cases, complete loss of electric propulsion from the affected motor until the fault is cleared

Possible Causes

Wiring damage — opens, shorts, or chafed insulation in the Motor B phase U circuit
Poor electrical connections at the motor inverter or motor assembly connectors
Blown fuse protecting the drive motor inverter module
Failed phase winding inside Motor B itself
Inverter module internal failure affecting the specific phase driver circuit
Corrosion or oxidation at connector terminals disrupting current flow
Faulty ground connection for the inverter assembly

How to Diagnose P0A67

Connect a professional-grade OBD2 scanner and confirm P0A67 is stored in the hybrid/primary PCM. Record the freeze-frame data, noting rpm, vehicle speed, coolant temperature, and load percentage — these conditions must be recreated during the verification drive.
Pull all stored codes from every module, not just the engine computer. Related codes — especially those pointing to inverter temperature, voltage supply, or ground circuits — often reveal the true culprit. Check manufacturer TSB databases for your specific make and model; P0A67 and similar hybrid motor codes frequently have documented factory fixes or software updates.
Perform a thorough visual inspection of the entire Motor B inverter wiring harness. Look for damaged wire insulation, rubbed-through spots against metal edges, connector pins that are pushed back or bent, and any signs of liquid contamination or corrosion at the plugs.
With the connector unplugged, check resistance of the affected phase U circuit from the inverter to the motor windings. Compare readings against specifications — an open circuit indicates broken wiring while unusually low resistance suggests shorted windings. Also verify good continuity on the ground paths.
Test reference voltage and signal integrity at the inverter connector with the system powered up, following all high-voltage safety protocols. Measure phase currents directly if your diagnostic equipment supports it, comparing the U phase reading against the V and W phases under similar load conditions.
Clear the code and complete a test drive that replicates the freeze-frame conditions — particular throttle position, speed range, and hybrid mode engagement. If P0A67 returns immediately or after the drive cycle, the root cause remains active and further component-level testing is required.

Repair Options and Costs

Wiring repair or connector replacement: $80–$250. Many P0A67 failures trace to damaged harness wiring or corroded connector pins. Repairing or replacing the affected section of wiring, or cleaning/replacing the connector, resolves the issue at relatively low cost.

Sensor or actuator replacement: $150–$500. If the motor windings themselves have failed internally, or a dedicated phase current sensor is faulty, that component must be replaced. Motor assembly costs vary significantly by vehicle application.

Inverter module repair or replacement: $300–$1,000. When the inverter's internal driver circuit for that specific phase fails, the entire inverter unit typically requires replacement or specialist repair. This represents the higher end of the repair spectrum.

Driving Safety Assessment

P0A67 generally permits continued vehicle operation, though you may notice diminished electric assist, reduced fuel economy, or occasional limp-mode activation depending on your vehicle's hybrid control strategy. The car will not strand you unexpectedly, but prolonged driving with an unresolved motor current fault risks cascading damage to the inverter or battery system. If accompanied by stuttering acceleration, unexpected engine revving, or hybrid system warning lights, address the fault within days rather than weeks.