Nissan — P155b00 [work]

While many battery-related issues can be handled by a competent DIYer, some aspects of the P155B00 diagnostic process require a professional touch.

To prevent the P155B00 code from appearing in the future, it's essential to:

Using a compatible professional scan tool, navigate to Work Support →right arrow nissan p155b00

In some older Versa and Sentra models, a software update from the dealer was released to address false P155B00 codes caused by overly sensitive logic in the ECM.

Since these sensors communicate over a high-speed CAN network, a break in the data lines can trigger the "00" sub-code. Diagnostic Steps While many battery-related issues can be handled by

Perform a battery load and health test using a digital battery analyzer. If the battery has bad cells or a low State of Health (SoH), replace it.

Battery Current Sensor Circuit Range/Performance Common Vehicles Affected: Nissan Altima, Sentra, Rogue, Versa, and Murano (typically models equipped with the HR/MR engine series, roughly 2007–2016). Diagnostic Steps Perform a battery load and health

A code like P155B00 indicates that the or Power Distribution Control Module has detected a signal from the battery current sensor that is outside of the expected range. This sensor is critical because it monitors the rate of battery charge and discharge, allowing the vehicle to manage the alternator's output and maintain fuel efficiency through "smart" charging systems. Common Causes

The ECM modulates alternator output via pulse-width modulation (PWM). Faults inside the alternator's internal regulator or the wiring harness managing the control signal will yield an energy control failure.