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 the car's computer has detected that too much electricity is going through a part of the electric pump that helps move the transmission fluid. It's like when too much water flows through a pipe and it might burst.
The code indicates that the current in the U phase of the electric or auxiliary transmission fluid pump motor is higher than expected.
The electric or auxiliary transmission fluid pump is responsible for circulating transmission fluid in vehicles, particularly hybrids or electric vehicles. The motor has multiple phases, and the 'U' phase refers to one of these phases. A high current condition in this phase suggests an electrical fault, possibly due to a short circuit or a failing motor.
• Warning light on the dashboard
• Unusual noises from the transmission area
• Reduced vehicle performance
• Short circuit in the motor winding
• Faulty motor control module
• Damaged wiring or connectors
Transmission Fluid: A lubricant that helps the transmission system function smoothly.
Electric Pump Motor: A motor that helps circulate transmission fluid in electric or hybrid vehicles.
• Check for any related trouble codes.
• Inspect the wiring and connectors of the pump motor.
• Test the motor control module for faults.
• Repair or replace damaged wiring or connectors.
• Replace the electric pump motor if faulty.
• Replace or reprogram the motor control module if needed.
• OBD-II scanner
• Multimeter
• Wiring diagram
$300 - $800
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance of the transmission system
• Inspect wiring and connectors periodically
• Ensure proper cooling of the electric motor
Electrical System Issue
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult with a certified mechanic for accurate diagnosis.
• Keep a record of any related symptoms or warning lights.
Check with the vehicle manufacturer for warranty coverage on the transmission system components.
This code is more common in hybrid and electric vehicles due to the complexity of their transmission systems.
High – This issue can lead to further damage if not addressed promptly.
Driving with this code may result in reduced vehicle performance and could be unsafe. Address the issue as soon as possible.
• Vehicle at operating temperature
• Transmission in drive mode
The electric transmission fluid pump is typically located near the transmission assembly, often on the side or bottom of the transmission housing.
Q: Can I drive with a P0B02 code?
A: It's not recommended to drive with this code as it may cause further damage to the transmission system.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to significant transmission damage and costly repairs.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.