If multiple modules have high resistance (3 or more) or the battery case shows swelling, replacement is the only durable solution. Consider a refurbished unit with a warranty rather than new OEM to save money.
(Refer to the specific model Year/Engine Wiring Diagram for pin locations)
Lithium-ion (or NiMH) battery modules naturally have a small amount of internal resistance. Over time, connections can loosen, cells can degrade, or temperature differences can cause one module to behave differently. When one module’s resistance is significantly higher (or lower) than its neighbors, the battery pack can no longer charge or discharge evenly. This creates a "weak link" that reduces overall performance and can lead to overheating. nissan p155b00
The P155B00 code is triggered when the difference in internal resistance between the highest and lowest modules exceeds Nissan’s tolerance threshold (typically >50% variance).
Access the Hybrid Battery Data Stream. Look for: If multiple modules have high resistance (3 or
Nissan’s service procedure: Activate the "Battery Resistance Learning" function if your scan tool supports it. The system will apply a small load and measure each module’s voltage drop. A module dropping more than 0.3V under load indicates a high-resistance fault.
The fault code P155B00 is associated with a specific problem that the vehicle's onboard computer, or Engine Control Module (ECM), has detected. Unfortunately, without direct access to a current database or a specific manufacturer's code list, providing a precise definition of this code can be challenging. However, I'll provide a general approach to understanding and potentially resolving issues related to OBD-II codes. Sensor Replacement: If power and ground are present
Modern Nissan vehicles utilize an Intelligent Battery Sensor (IBS) attached to the negative battery terminal. The IBS is a mechatronic device that measures:
The IBS calculates the State of Charge (SOC) and State of Health (SOH) of the battery. It communicates this data to the ECM via a Local Interconnect Network (LIN) bus or a dedicated signal wire. The ECM uses this data to regulate the alternator duty cycle, adjusting charging voltage based on the battery's needs (often referred to as "Decoupling" or "Load Dump" strategies).
