The P0B04 OBD-II code indicates an issue with the auxiliary transmission fluid pump motor. This code is triggered when the Power Inverter Module detects that the current flowing to the pump is lower than expected, which can severely impact the vehicle’s transmission performance.
What Does the P0B04 Code Mean?
OBD-II code P0B04 stands for “AUXILIARY Transmission Fluid Pump Motor Phase V Current Low.” This means that the Power Inverter Module has identified a problem with the current flow to the auxiliary transmission fluid pump motor, which is crucial for the proper functioning of the transmission system.
What Causes the P0B04 Code?
The P0B04 code can be caused by several factors, including:
- Power inverter module failure
- Power inverter module software needing an update
When the Power Inverter Module fails or does not operate correctly, it can lead to insufficient current being sent to the auxiliary transmission fluid pump, triggering the code.
What Are the Symptoms of the P0B04 Code?
Common symptoms associated with the P0B04 code include:
- The vehicle will not operate
This symptom indicates a critical issue that requires immediate attention, as it may leave you stranded.
How Serious Is the P0B04 Code?
The P0B04 code is classified as urgent. It signals a significant malfunction within the vehicle’s transmission system that can lead to severe damage if not addressed promptly. Ignoring this code can also pose safety risks for the driver and passengers.
How to Diagnose the P0B04 Code
To diagnose the P0B04 code, a mechanic will typically follow these steps:
- Use an OBD-II scanner to confirm the presence of the P0B04 code.
- Inspect the Power Inverter Module and the associated wiring for any visible damage or loose connections.
- Check for any software updates that may be required for the Power Inverter Module.
- Test the auxiliary transmission fluid pump motor to ensure it is functioning correctly.
Common Repairs for the P0B04 Code
Repairs for the P0B04 code may include:
- Replacing or repairing the Power Inverter Module
- Updating the software of the Power Inverter Module
- Fixing any electrical connections related to the auxiliary transmission fluid pump
How Much Does It Cost to Fix the P0B04 Code?
The cost to repair the P0B04 code can vary widely depending on your vehicle’s make and model and the underlying issue. Generally, repairs may range from $150 to $1,500, especially if the Power Inverter Module needs to be replaced.
Can I Fix the P0B04 Code Myself?
While some DIY enthusiasts might attempt to fix the P0B04 code themselves, it is crucial to understand that diagnosing and repairing transmission issues can be complex. If you are not experienced with automotive repairs, it is advisable to seek professional help to avoid further damage and ensure safety.
