P0A67 — Drive Motor “B” Phase U Current Low #

Note: The code description may vary depending on the OEM (Original Equipment Manufacturer).

• Drive Motor “B” Phase U Current Low (Generic OBD-II)
• Hybrid/EV Drive Motor ‘B’ Phase U Current Too Low (Toyota, Lexus)
• Motor Generator “B” Phase U Current Low (Honda)
• Traction Motor ‘B’ U-Phase Current Insufficient (Nissan)

Summary of Code P0A67 #

The P0A67 diagnostic trouble code (DTC) signals that the vehicle’s powertrain control module (PCM) or hybrid/EV control module has detected abnormally low electrical current in the U phase of the drive motor “B” circuit. In electric and hybrid vehicles, the drive motor is a key component responsible for propulsion. The drive motor typically uses three-phase AC power (U, V, and W phases). If the current in the U phase drops below a specified threshold, it may indicate a fault in the motor, wiring, or control electronics. This code is most common in vehicles with dual or multiple electric drive motors, where “B” refers to the secondary motor.

Frequent Symptoms for Code P0A67 #

When code P0A67 is present, you may notice one or more of the following symptoms. Some vehicles will enter a “limp mode” to protect the powertrain. Here’s what drivers and technicians often observe:

• Illuminated Check Engine Light or Service Hybrid System warning
• Loss of electric drive power or reduced acceleration
• Unusual noises from the drive motor area
• Warning messages related to traction or hybrid systems
• Possible increase in engine use (for hybrids) to compensate for electric motor loss

Probable Causes for Code P0A67 #

Multiple factors can trigger a P0A67 code. The most frequent causes, ranked from most to least common, are:

1. Faulty drive motor “B” (internal winding or insulation issue in the U phase)
2. Damaged wiring or connectors in the U phase circuit (open, corrosion, or short-to-ground)
3. Defective power inverter module (component that converts DC battery power to AC for the motor)
4. Faulty current sensor monitoring the U phase
5. Control module malfunction (PCM or hybrid/EV ECU)

Step-by-Step Diagnosis for Code P0A67 #

Diagnosing P0A67 requires a systematic approach to avoid unnecessary repairs. Follow these steps to isolate the fault:

1. Verify the code with a professional-grade scan tool and check for related DTCs.
2. Visually inspect the wiring and connectors around drive motor “B” and the inverter for damage, corrosion, or water intrusion.
3. Check the U phase circuit continuity and resistance using a digital multimeter (with the battery and high-voltage system safely isolated).
4. Test the drive motor windings for shorts or open circuits as per the OEM service manual.
5. Inspect inverter output and current sensor signals with a compatible scan tool or oscilloscope.
6. If all else checks out, consider testing or replacing the power inverter module or control unit as per OEM procedure.

Possible Repairs for Code P0A67 #

Repairs for P0A67 should always match the identified cause. Common solutions include:

• Repairing or replacing damaged U phase wiring or connectors
• Replacing the drive motor “B” if internal faults are detected
• Repairing or replacing the power inverter module
• Replacing a faulty current sensor
• Reprogramming or replacing the control module if necessary

Is It Safe to Drive with Code P0A67? #

Driving with code P0A67 is generally not recommended. The affected motor’s performance will be compromised, and there is a risk of sudden power loss or vehicle stalling, especially in hybrid or electric cars. In many cases, the vehicle will enter a reduced power mode or become undriveable to prevent further damage. If this code appears, have your vehicle inspected and repaired by a qualified technician as soon as possible.

Vehicles Most Commonly Affected by Code P0A67 #

Code P0A67 is most frequently reported on late-model hybrid and electric vehicles using multi-phase AC drive motors. The following makes and models are particularly known for this code:

• Toyota Prius, Camry Hybrid, RAV4 Hybrid
• Lexus RX, ES, GS Hybrid models
• Nissan Leaf, e-NV200
• Honda Accord Hybrid, Clarity
• Chevrolet Volt
• Kia Niro, Hyundai Ioniq (select models)

Common Mistakes & Best Practices for Code P0A67 #

Misdiagnosis is common with high-voltage electrical faults. To ensure accurate repair, keep these points in mind:

• Do not replace the drive motor without confirming the root cause—wiring faults are often overlooked.
• Avoid working on high-voltage systems without proper training and safety equipment. Always follow OEM safety procedures.
• Use only OEM-approved scan tools and service information when working on hybrid/electric systems.
• Document all test results and repairs for future reference.

Express FAQ for Code P0A67 #

Here are some quick answers to common questions about P0A67:

• Q: Can I clear P0A67 and keep driving?
  A: Clearing the code without fixing the underlying issue may temporarily turn off the warning, but the problem will return and could worsen. Always address the root cause.
• Q: How much does it cost to repair P0A67?
  A: Repair costs vary widely depending on the cause—simple wiring repairs may cost a few hundred dollars, but replacing a drive motor or inverter can exceed $2,000–$5,000. Accurate diagnosis is key to controlling costs.