P0B0B Code - Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High
Quick Answer
The diagnostic trouble code P0B0B indicates an issue with the Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit being too high. Common causes include Faulty auxiliary transmission fluid pump motor, Wiring or connection issues in the supply voltage circuit, Corrosion or damage to electrical connectors. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0B0B indicates Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High.
- Common causes
- Common causes include Faulty auxiliary transmission fluid pump motor, Wiring or connection issues in the supply voltage circuit, Corrosion or damage to electrical connectors.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0B0B Description
The diagnostic trouble code P0B0B indicates an issue with the Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit being too high. This code is commonly found in hybrid vehicles that utilize an auxiliary transmission fluid pump to assist in the cooling and lubrication of the transmission system. The auxiliary pump motor is responsible for circulating transmission fluid to prevent overheating and ensure smooth operation of the transmission.
Common Causes of P0B0B
- Faulty auxiliary transmission fluid pump motor.
- Wiring or connection issues in the supply voltage circuit.
- Corrosion or damage to electrical connectors.
- Issues with the powertrain control module (PCM) or transmission control module (TCM).
- High voltage spikes or fluctuations in the electrical system.
Symptoms of P0B0B
- Illumination of the check engine light on the dashboard.
- Transmission overheating or erratic transmission shifting.
- Reduced fuel efficiency.
- Unusual noises coming from the transmission system.
- Vehicle may go into limp mode to prevent further damage.
How to Fix P0B0B
- Begin by conducting a thorough inspection of the auxiliary transmission fluid pump motor, wiring, and connectors for any visible damage or corrosion.
- Test the voltage output of the supply circuit using a multimeter to determine if it is within the specified range.
- If the voltage is too high, check for any short circuits or faulty components in the circuit.
- Replace the auxiliary transmission fluid pump motor if it is found to be faulty.
- Clear the diagnostic trouble codes from the vehicle's system and perform a test drive to ensure the issue has been resolved.
Cost to Fix P0B0B
The cost of repairing the Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High issue can vary depending on the specific vehicle make and model, as well as the extent of the damage. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate.
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Code P0B0B Information for Specific Makes
- P0B0B Subaru — Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High
Frequently Asked Questions about P0B0B Code
1. What does the OBDII code P0B0B mean?
Code P0B0B indicates that the powertrain control module (PCM) has detected a high voltage issue in the auxiliary transmission fluid pump motor supply circuit.
2. What are the common symptoms of code P0B0B?
Symptoms may include the transmission operating in limp mode, harsh or delayed shifting, overheating transmission fluid, and the illumination of the check engine light.
3. What causes the P0B0B code to trigger?
Common causes include a faulty auxiliary transmission fluid pump, damaged wiring or connectors in the circuit, a defective PCM, or an issue with the vehicle's electrical system, such as a failing battery or alternator.
4. How is the P0B0B code diagnosed?
A technician will use a scan tool to confirm the code, inspect the wiring and connectors in the circuit for damage, test the auxiliary transmission fluid pump motor, and check the voltage levels in the system.
5. Can I drive my vehicle with the P0B0B code active?
Driving with this code is not recommended, as it may lead to poor transmission performance, overheating, and potential long-term damage.
6. How do I fix the P0B0B code?
Repairs may involve replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring or connectors, and addressing any issues with the vehicle's electrical system.
7. Can a failing alternator cause the P0B0B code?
Yes, a failing alternator can cause voltage irregularities that may trigger this code.
8. How much does it cost to repair a P0B0B code?
Repair costs vary depending on the issue but may range from $150 for minor wiring repairs to $1,000 or more for replacing the auxiliary transmission fluid pump.
9. Does the P0B0B code always mean the auxiliary pump is bad?
No, the code could also be caused by wiring problems, electrical system issues, or a faulty PCM.
10. Can I clear the P0B0B code without making repairs?
Clearing the code without addressing the underlying issue may cause it to return, and the transmission may continue to experience performance problems.
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