AutoCodes – Generic – P0B0B

P0B0B Code - Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High

Quick Answer

The Engine Control Module (ECM) monitors the Auxiliary Transmission Fluid Pump Motor. Common causes include Faulty Auxiliary Transmission Fluid Pump, Auxiliary Transmission Fluid Pump harness is open or shorted, Auxiliary Transmission Fluid Pump circuit poor electrical connection. 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, Auxiliary Transmission Fluid Pump harness is open or shorted, Auxiliary Transmission Fluid Pump circuit poor electrical connection.
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 Popularity 3,498

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B0B Description

The Engine Control Module (ECM) monitors the Auxiliary Transmission Fluid Pump Motor. The ECM sets the OBDII code when the Auxiliary Transmission Fluid Pump Motor signal is out of factory specifications.

OBDII Code P0B0B - Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High - AutoCodes.com — P0B0B Code - Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High

What does this mean?

What are the Possible Causes of the DTC P0B0B?

Faulty Auxiliary Transmission Fluid Pump
Auxiliary Transmission Fluid Pump harness is open or shorted
Auxiliary Transmission Fluid Pump circuit poor electrical connection

How to Fix the DTC P0B0B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0B0B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0B0B code?

Need more information on how to fix the P0B0B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B0B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0B0B Subaru — Auxiliary Transmission Fluid Pump Motor Supply Voltage Circuit High

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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.