The P0B0B: Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High refers to a condition where the supply voltage to the auxiliary transmission fluid pump motor is higher than expected. This can be caused by faulty wiring, poor connections, or a defective power supply. If unresolved, it may lead to improper functioning of the transmission fluid pump, risking potential damage to the transmission.
P0B0B – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0B0B: Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High |
| Is it serious? | Yes, high voltage can lead to potential damage to the pump or other components. |
| Possible causes | – High supply voltage in the auxiliary transmission fluid pump motor circuit – Faulty wiring or connection – Defective power supply |
| How to diagnose? | – Measure supply voltage in the motor circuit – Inspect wiring and connections – Test the power supply |
P0B0B Meaning
The P0B0B code is triggered when the auxiliary transmission fluid pump motor is receiving a supply voltage higher than specified. This could be the result of electrical issues such as faulty wiring, loose connections, or a malfunctioning power supply, all of which can cause the pump to operate incorrectly.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to detect any additional related codes. | OBD-II Scanner |
| Measure Supply Voltage | Use a multimeter to check the voltage in the motor circuit. Compare readings to the manufacturer’s specifications. | Multimeter |
| Inspect Wiring and Connections | Inspect the wiring and connections for signs of wear, damage, or corrosion. | Flashlight, Multimeter, Safety Gloves |
| Test the Power Supply | Check the power supply to ensure it is providing the correct voltage. Replace if necessary. | Multimeter, Diagnostic Tool |
| Clear the Code and Test Drive | After repairs, clear the code and take the vehicle for a test drive to verify the issue has been resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Rescan the vehicle after the test drive to ensure the P0B0B code has not returned. | 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.
