P155b00 — Nissan

Because this is a specific Nissan code, professional diagnostic equipment is recommended. However, you can check the following:

: The sub-condition byte, indicating a general failure or no sub-type information available.

: Most drivers report the car runs normally otherwise, as the system defaults to an open position to prevent overheating. Diagnostic & Repair Steps Visual Inspection

Resistance caused by corrosion on the terminal connections or the chassis ground cable will disrupt voltage reference loops. nissan p155b00

Below is a breakdown of what this code means, the symptoms to look for, and the common steps for diagnosis and repair. What is Fault Code P155B00?

Diagnostic Trouble Code (DTC) P155B00 is a manufacturer-specific code indicating an issue with the . This sensor is a critical component of the vehicle's charging system, often integrated into the Intelligent Battery Sensor (IBS). When this code is triggered, the Engine Control Module (ECM) has detected that the signal from the battery current sensor is out of the expected range, or that there is a performance discrepancy within the circuit.

Vehicles equipped with Nissan’s automatic idling stop/start technology will automatically deactivate the system as a protective measure against battery drain. Because this is a specific Nissan code, professional

If the wiring and battery check out fine, the battery current/voltage sensor itself is often the point of failure. Disconnect the negative terminal, unbolt the old sensor module, fit the new OEM replacement, and secure the connections. Perform a Self-Learning Reset

If the problem is localized to damaged wiring or a corroded connector, repair costs are generally lower.

Monitor the readings for NOx sensor 1 (front) and NOx sensor 2 (rear). If a sensor is stuck at a default value (e.g., a constant ppm value that never changes), it is likely faulty. it is likely faulty.

If the sensor itself is confirmed to be faulty, replacement is the most effective remedy.

The ECM sets P155B00 when:

Test the 12-volt battery using a dedicated digital battery load tester. Ensure the battery passes a health check (CCA capacity) and holds a static charge above 12.6 volts with the ignition off. Replace the battery if it fails the load test. Step 3: Inspect the Battery Current Sensor and Harness