The P0B07: Auxiliary Transmission Fluid Pump Motor Phase W Current Low fault code indicates that the Phase W current in the auxiliary transmission fluid pump motor is lower than expected. This could result from a faulty current sensor, issues with the wiring or connections, or a malfunction in the auxiliary transmission fluid pump motor itself. Low current can affect the motor’s ability to properly circulate transmission fluid, leading to inadequate cooling and lubrication of the transmission.
P0B07 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0B07: Auxiliary Transmission Fluid Pump Motor Phase W Current Low |
| Is it serious? | Yes, low Phase W current can impact the motor’s ability to circulate transmission fluid, which may result in poor transmission cooling and lubrication. |
| Possible causes | – Low Phase W current in the auxiliary transmission fluid pump motor – Faulty current sensor – Wiring or connection issue |
| How to diagnose? | – Measure Phase W current to verify low reading – Test the current sensor – Inspect wiring and connections |
P0B07 Meaning
The P0B07: Auxiliary Transmission Fluid Pump Motor Phase W Current Low fault code indicates that the current in the Phase W circuit of the auxiliary transmission fluid pump motor is lower than normal. This phase is critical for driving the motor that circulates transmission fluid, ensuring the transmission stays properly cooled and lubricated. A malfunction in the current sensor, wiring, or motor could reduce the efficiency of the transmission cooling system.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any related fault codes that may provide further context on the low current issue. | OBD-II Scanner |
| Measure Phase W Current | Use a multimeter or diagnostic tool to measure the Phase W current of the auxiliary transmission fluid pump motor. Compare the readings to manufacturer specifications to confirm the low current condition. | Multimeter, Diagnostic Tool |
| Test the Current Sensor | Test the Phase W current sensor to verify its accuracy and proper functionality. A malfunctioning sensor could give false low readings. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connections | Inspect the wiring and connections associated with the Phase W current sensor for signs of damage, loose connections, or corrosion. | Flashlight, Multimeter |
| Repair or Replace Components | Repair or replace faulty components, including the current sensor, wiring, or transmission fluid pump motor, to restore proper Phase W current. | Repair Tools, Replacement Parts |
| Clear the Code and Test Drive | After making necessary repairs, clear the fault code using an OBD-II scanner and perform 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 P0B07 code does not return. | OBD-II Scanner |
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