What Does P0B0D Mean?
The powertrain control module has detected a fault in the auxiliary transmission fluid pump motor control module itself. This dedicated controller manages the three-phase motor operation, monitors current and voltage, and communicates with the main powertrain controller. A fault in this module means the auxiliary pump cannot be properly commanded, and hybrid engine-off transmission support is lost.
Common Causes
35%
Internal electronic failure in the pump control module (capacitor, MOSFET, or processor failure)
25%
Loss of CAN bus communication between the pump module and the powertrain controller
20%
Power supply or ground fault to the pump control module
10%
Software corruption or calibration error in the pump control module
10%
Water intrusion or corrosion damage to the module circuit board
Diagnostic Steps
1
Check for communication with the auxiliary pump control module using the scan tool. If the module is not responding on the CAN bus, verify supply voltage and ground at the module connector first.
2
Measure supply voltage and ground at the pump control module connector pins with the ignition on. Supply should be battery voltage; ground should be less than 0.5 ohms to battery negative.
3
Inspect the CAN bus wiring (CAN-H and CAN-L) at the pump module connector. Measure CAN bus voltage levels — CAN-H should be approximately 2.5-3.5V and CAN-L approximately 1.5-2.5V with the ignition on.
4
Inspect the module connector and housing for signs of water intrusion, corrosion, or physical damage. Check the connector seal integrity and look for discoloration of the pins.
5
If supply, ground, and communication circuits are verified good, attempt a module reset by disconnecting the battery for 30 seconds. If the module still faults, it likely requires replacement and reprogramming.
Estimated Repair Cost
$500 - $2,000
Parts + labor, varies by vehicle and location
The powertrain control module has detected a fault in the auxiliary transmission fluid pump motor control module itself. This dedicated controller manages the three-phase motor operation, monitors current and voltage, and communicates with the main powertrain controller. A fault in this module means...
The most common cause of P0B0D (Auxiliary Transmission Fluid Pump Motor Control Module) is: Internal electronic failure in the pump control module (capacitor, MOSFET, or processor failure)
Typical repair costs for P0B0D range from $500 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without a functioning pump control module, the auxiliary pump is completely disabled. Auto-stop and EV mode will not function. The vehicle can be driven safely with the engine running, as the mechanical pump provides fluid flow. Repair is needed to restore hybrid functionality. The module replacement typically requires dealer-level programming.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B0D to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Transmission Auxiliary Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
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