Nissan P155b-00 _hot_ -

The diagnostic trouble code (DTC) P155B-00 in Nissan vehicles is a manufacturer-specific code primarily associated with the variable geometry turbocharger (VGT) control system. Specifically, it indicates a performance issue or a "rationality" fault with the turbocharger boost control actuator. Technical Overview

Actuator Failure: The electronic motor or the internal gears of the turbocharger actuator may wear out or fail due to heat and vibration. nissan p155b-00

Diagnosing and Repairing the Nissan P155B-00 Code The diagnostic trouble code (DTC) P155B-00 in Nissan

Verify the "Air Sensor" or "O2 Sensor" fuse in the Intelligent Power Distribution Module (IPDM) or under-dash fuse box. Replace the Sensor: Flush coolant every 60,000 miles – Old coolant

What is the Nissan P155B-00 Code?

: The Engine Control Module (ECM) has detected that the battery current sensor is providing an out-of-range or improbable signal.

Flush coolant every 60,000 miles – Old coolant becomes acidic and can corrode the valve internals.
Use only Nissan Genuine coolant (blue 50/50 premix). Universal green coolant may cause seal damage.
Inspect wiring periodically – Especially if you live in a rust-belt state.
Address overheating immediately – The first time the gauge rises, diagnose it. Delay kills engines.

Auto Start-Stop Failure: On newer models, this system may be disabled because the ECM cannot accurately verify the battery's state of charge. Potential Causes