The P0B05: Auxiliary Transmission Fluid Pump Motor Phase V Current High fault code refers to a condition where the Phase V current in the auxiliary transmission fluid pump motor is higher than expected. This may be caused by a faulty current sensor, electrical problems in the Phase V circuit, or a malfunction in the auxiliary transmission fluid pump motor itself. High current can lead to overheating or damage to the motor, potentially affecting transmission fluid circulation.
P0B05 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0B05: Auxiliary Transmission Fluid Pump Motor Phase V Current High |
| Is it serious? | Yes, high Phase V current can cause overheating or damage to the motor, leading to poor transmission cooling and lubrication. |
| Possible causes | – High Phase V current in the auxiliary transmission fluid pump motor – Faulty current sensor – Electrical issue in the Phase V current circuit |
| How to diagnose? | – Measure Phase V current to verify high reading – Test the current sensor – Inspect the electrical system for faults |
P0B05 Meaning
The P0B05: Auxiliary Transmission Fluid Pump Motor Phase V Current High fault code indicates that the Phase V current in the auxiliary transmission fluid pump motor is above the normal range. The Phase V current helps drive the motor that circulates transmission fluid, which is essential for cooling and lubricating the transmission. High current may result from sensor failure, electrical circuit issues, or a malfunctioning motor, which could reduce transmission cooling efficiency and potentially lead to system damage.
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 may provide further insight into the high current issue. | OBD-II Scanner |
| Measure Phase V Current | Use a multimeter or diagnostic tool to measure the Phase V current in the auxiliary transmission fluid pump motor. Compare the readings with the manufacturer’s specifications to verify if the current is too high. | Multimeter, Diagnostic Tool |
| Test the Current Sensor | Test the Phase V current sensor to ensure it is accurately reading current levels. A faulty sensor may incorrectly indicate high current. | Multimeter, Diagnostic Tool |
| Inspect Electrical System for Faults | Inspect the wiring and connections associated with the Phase V current circuit for signs of electrical faults, such as short circuits, loose connections, or corrosion that could cause high current. | Flashlight, Multimeter |
| Repair or Replace Components | Repair or replace any faulty components, including the current sensor, wiring, or the transmission fluid pump motor, to correct the high current issue. | Repair Tools, Replacement Parts |
| Clear the Code and Test Drive | After 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 P0B05 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