Nissan P155b00 Guide

: With the engine off, gently see if the flaps move freely by hand (do not force them). Connector Check

A: There is no single, widely published TSB for P155B00, as the causes can vary. However, Nissan does release Technical Service Bulletins for common issues related to the charging system and battery sensors. A qualified Nissan technician can check for any relevant TSBs for your specific vehicle model and year.

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. nissan p155b00

: Heavy soot accumulation in the EGR cooler or valve can cause abnormal temperature spikes.

Unplug the small wiring harness connector attached directly to the negative terminal current sensor. : With the engine off, gently see if

The ECM sets P155B00 when:

(Refer to the specific model Year/Engine Wiring Diagram for pin locations) A qualified Nissan technician can check for any

Turn the ignition on (engine off) and probe the power supply wire to the battery sensor connector to verify it receives clean voltage from the IPDM or fuse block.

Check the connector pins for corrosion, water intrusion, or backed-out terminals.