Nissan P155b00 | Must Read |

Ignoring P155B00 can damage the entire hybrid battery pack. The healthy modules will be forced to overcompensate for the weak one, leading to a cascading failure. Continued driving also risks overheating the battery, which could trigger a failure of the high-voltage safety contactors (requiring a full pack replacement).

A: Mostly. It appears on the Note, Serena, X-Trail (T32 Hybrid), and Infiniti M35h / QX60 Hybrid. It rarely appears on the Leaf because the Leaf’s battery architecture is different (no internal resistance monitoring in the same way). nissan p155b00

In plain English, your Nissan’s onboard computer (the Hybrid Vehicle Control ECU or HVCM) has detected that the internal electrical resistance within one or more of the battery modules has deviated too far from the expected range compared to the other modules. 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. Ignoring P155B00 can damage the entire hybrid battery pack