Nissan P155b-00 -

P155B-00 – Electric Intake Valve Control Actuator Circuit Range/Performance (Bank 1)

This code indicates that the Engine Control Module (ECM) has detected a performance issue or an out-of-range condition in the electric intake valve control actuator circuit for Bank 1. Unlike traditional oil-pressure-driven VVT, some Nissan models use an electric motor-driven actuator for continuous valve lift/timing control (e.g., on MR20DD, QR25DE, or VQ series with electric VVT).

Several underlying issues can trigger this DTC. In our experience repairing Nissans, here are the most common culprits: nissan p155b-00

| Cause | Likelihood | Description | |-------|------------|-------------| | Faulty Coolant Bypass Valve | High | The internal mechanism seizes, or the electric motor fails. This is the #1 cause. | | Wiring or Connector Issues | Medium | Corroded pins, broken wires, or loose connectors at the valve harness. | | Low Coolant Level | Medium | Air pockets in the system prevent proper valve actuation or confuse the temperature sensor. | | ECM Software Glitch | Low | On rare occasions, a software update from Nissan resolves false P155B-00 codes. | | Blown Fuse | Low | The bypass valve circuit may share a fuse with other components. |