The P0B00: Auxiliary Transmission Fluid Pump Motor Phase U Current fault code refers to an issue with the Phase U current in the auxiliary transmission fluid pump motor. This fault can be caused by a faulty Phase U current sensor, an electrical issue in the Phase U circuit, or a malfunction in the auxiliary transmission fluid pump motor. If not addressed, this issue could affect the transmission fluid pump’s ability to function properly, potentially leading to transmission performance issues.
P0B00 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0B00: Auxiliary Transmission Fluid Pump Motor Phase U Current |
| Is it serious? | Yes, this issue can affect the transmission’s cooling and lubrication, which can lead to performance issues. |
| Possible causes | – Faulty Phase U current sensor in the auxiliary transmission fluid pump motor – Electrical issue in the Phase U current circuit – Faulty auxiliary transmission fluid pump motor |
| How to diagnose? | – Measure Phase U current of the auxiliary transmission fluid pump motor – Inspect wiring and connections for Phase U current sensor – Test the auxiliary transmission fluid pump motor |
P0B00 Meaning
The P0B00: Auxiliary Transmission Fluid Pump Motor Phase U Current fault code indicates that there is a problem with the Phase U current in the auxiliary transmission fluid pump motor. This current phase is essential for the proper functioning of the motor that drives the auxiliary pump, which circulates transmission fluid for cooling and lubrication. A malfunction in this phase could be due to a sensor failure, wiring issues, or a problem with the motor itself.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related fault codes that might provide further details on the issue. | OBD-II Scanner |
| Measure Phase U Current | Use a multimeter or diagnostic tool to measure the Phase U current of the auxiliary transmission fluid pump motor. Compare the readings with the manufacturer’s specifications. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connections for Phase U Current Sensor | Visually inspect the wiring and connections associated with the Phase U current sensor for any signs of damage, loose connections, or corrosion. | Flashlight, Multimeter |
| Test the Auxiliary Transmission Fluid Pump Motor | Test the operation of the auxiliary transmission fluid pump motor to ensure it is functioning properly. If the motor is not running within normal parameters, it may need to be repaired or replaced. | Diagnostic Tool, Multimeter |
| Repair or Replace Components | If the Phase U current sensor, wiring, or the motor is faulty, repair or replace the necessary components to restore normal operation. | Repair Tools, Replacement Parts |
| Clear the Code and Test Drive | After making repairs, clear the fault code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | Re-scan the vehicle after the test drive to confirm that the P0B00 code does not return. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)