The P0B01: Auxiliary Transmission Fluid Pump Motor Phase U Current Low fault code indicates that the Phase U current in the auxiliary transmission fluid pump motor is lower than expected. This could be caused by a faulty current sensor, issues with the wiring or connections, or a malfunction in the auxiliary transmission fluid pump motor itself. If left unresolved, low Phase U current may reduce the efficiency of the transmission fluid pump, affecting cooling and lubrication.
P0B01 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0B01: Auxiliary Transmission Fluid Pump Motor Phase U Current Low |
| Is it serious? | Yes, low current in the transmission fluid pump motor can affect transmission cooling and lubrication, leading to performance issues. |
| Possible causes | – Low Phase U current in the auxiliary transmission fluid pump motor – Faulty current sensor – Wiring or connection issue |
| How to diagnose? | – Measure Phase U current to verify low reading – Test the current sensor – Inspect wiring and connections |
P0B01 Meaning
The P0B01: Auxiliary Transmission Fluid Pump Motor Phase U Current Low fault code signals that the current in the Phase U circuit of the auxiliary transmission fluid pump motor is below the expected range. This phase is crucial for ensuring the motor runs efficiently and can circulate transmission fluid for cooling and lubrication. Low Phase U current could result from a faulty current sensor, wiring problems, or motor failure, leading to reduced transmission cooling efficiency.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional fault codes that may provide more context about the low current 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 to the manufacturer’s specifications to confirm the low current condition. | Multimeter, Diagnostic Tool |
| Test the Current Sensor | Test the Phase U current sensor to verify its accuracy and proper functioning. A malfunctioning sensor can result in incorrect current readings. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connections | Inspect the wiring and connections associated with the Phase U current sensor for any signs of damage, loose connections, or corrosion that could cause low current. | Flashlight, Multimeter |
| Repair or Replace Components | Repair or replace any faulty components, including the current sensor, wiring, or the transmission fluid pump motor itself, to restore proper Phase U current. | 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 has been resolved. | OBD-II Scanner |
| Recheck for Codes | Re-scan the vehicle after the test drive to confirm that the P0B01 code does not return. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko