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P0B07 Chevrolet Code - Auxiliary Transmission Fluid Pump Low Current

Quick Answer

The Diagnostic Trouble Code (DTC) P0B07 indicates a low current condition in the auxiliary transmission fluid pump, which is crucial for the proper functioning of hybrid and electric vehicles. Common causes include Faulty Transmission Fluid Pump Electric/AuxiliaryTransmission Fluid Pump Electric/Auxiliary harness is open or shortedTransmission Fluid Pump Electric/Auxiliary circuit has a poor electrical connectionFaulty Power Inverter ModuleWiring issues, such as frayed or damaged wires affecting the pump's operation. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0B07 Chevrolet indicates Auxiliary Transmission Fluid Pump Low Current.
Common causes
Common causes include Faulty Transmission Fluid Pump Electric/AuxiliaryTransmission Fluid Pump Electric/Auxiliary harness is open or shortedTransmission Fluid Pump Electric/Auxiliary circuit has a poor electrical connectionFaulty Power Inverter ModuleWiring issues, such as frayed or damaged wires affecting the pump's operation.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Nov 05, 2025
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Code P0B07 Chevrolet Description

The Diagnostic Trouble Code (DTC) P0B07 indicates a low current condition in the auxiliary transmission fluid pump, which is crucial for the proper functioning of hybrid and electric vehicles. The auxiliary transmission fluid pump is responsible for circulating transmission fluid, ensuring that the transmission operates efficiently and remains adequately lubricated. This pump is controlled by the hybrid/EV powertrain control module, which monitors the current flowing through the pump's motor. The motor operates using three-phase AC electricity, with the phases designated as U, V, and W, connected in a wye configuration. When the current detected in any of these phases falls below 1 ampere, the DTC P0B07 is triggered.
OBDII Code P0B07 Chevrolet - Auxiliary Transmission Fluid Pump Low Current
P0B07 Chevrolet Code - Auxiliary Transmission Fluid Pump Low Current

Common Causes of P0B07 Chevrolet

  1. Faulty Transmission Fluid Pump Electric/Auxiliary
  2. Transmission Fluid Pump Electric/Auxiliary harness is open or shorted
  3. Transmission Fluid Pump Electric/Auxiliary circuit has a poor electrical connection
  4. Faulty Power Inverter Module
  5. Wiring issues, such as frayed or damaged wires affecting the pump's operation

Symptoms of P0B07 Chevrolet

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased acceleration and performance
  3. Erratic or harsh shifting of the transmission
  4. Increased engine temperature due to inadequate transmission cooling
  5. Unusual noises from the transmission area

How to Fix P0B07 Chevrolet

  1. Perform a thorough diagnostic to confirm the presence of DTC P0B07 and check for any related codes.
  2. Inspect the auxiliary transmission fluid pump and its electrical connections for any visible damage or wear.
  3. Test the current flowing through the pump's motor phases to identify any discrepancies.
  4. If the pump is faulty, replace it with a new unit and ensure all connections are secure.
  5. Clear the DTC and perform a road test to confirm that the issue has been resolved and the pump operates correctly.

Cost to Fix P0B07 Chevrolet

The cost to repair the P0B07 code can vary significantly based on the specific vehicle make and model, as well as the local labor rates. Typically, parts for the auxiliary transmission fluid pump can range from $200 to $600, while labor costs can add an additional $100 to $300, depending on the complexity of the job. Most shops charge between $80 and $150 per hour, with dealerships often being on the higher end of the spectrum. Independent shops may offer more competitive rates. Always consider obtaining multiple estimates to ensure a fair price for the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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