Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a sensor in the car's electric motor isn't working right. It's like when a thermometer says it's super cold outside, but you know it's warm. The sensor is giving wrong information.
The current sensor for the drive motor's Phase W is detecting a current that is lower than expected, indicating a possible issue with the sensor or the circuit.
The P1B56 code is triggered when the powertrain control module (PCM) detects that the current sensor for the drive motor's Phase W is reading a current that is below the expected range. This could be due to a malfunctioning sensor, wiring issues, or a problem with the motor itself.
• Check Engine Light is on
• Reduced power or performance
• Unusual noises from the motor
• Faulty current sensor
• Damaged wiring or connectors
• Malfunctioning drive motor
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the current sensor for proper operation.
• Replace the faulty current sensor.
• Repair or replace damaged wiring or connectors.
• Inspect and repair the drive motor if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $500
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regular maintenance checks
• Ensure proper electrical connections
• Avoid excessive moisture exposure
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on electrical components.
This code has been associated with electric and hybrid vehicles, particularly as they age and components wear.
Moderate – Should be addressed soon to avoid further damage.
Driving with this code may lead to reduced vehicle performance and should be addressed promptly.
• Vehicle in ON position
• Drive motor operational
The current sensor is typically located near the drive motor or integrated into the motor control module.
Q: Can I drive with a P1B56 code?
A: It's not recommended to drive long distances as it may lead to reduced performance or further damage.
Q: How do I reset the P1B56 code?
A: The code can be reset with an OBD-II scanner, but it's important to fix the underlying issue first.
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