If power, ground, and communication pathways to the ECM test fine but the code refuses to clear or instantly returns, the battery current sensor itself is faulty and needs replacement. Step 5: Replacing the Sensor and Performing a Reset
While the car may drive normally, owners often report the following:
If corrosion or loose bus bars are the cause: nissan p155b00
Before exploring Nissan-specific details, it is helpful to understand the code's general structure. The first letter, "P", stands for , indicating a fault within the engine, transmission, or associated drivetrain components. The following "1" is a generic, standardized OBD2 code, meaning it has a similar definition across many car brands. The "55" indicates the specific fault area, and the "B" is the specific fault within that area. The final "00" suggests that the code is a standard DTC without additional manufacturer-specific information.
Put the vehicle on a ramp to inspect the sensors. Unplugging the sensors one by one while monitoring live data can help confirm which specific sensor is unresponsive. If power, ground, and communication pathways to the
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.
You may see messages related to the exhaust fluid system or a "countdown" until the vehicle enters a no-start mode. The following "1" is a generic, standardized OBD2
The Energy Management Control circuit relies on a network of sensors and modules. A failure anywhere along this loop can trigger P155B00: