Nissan P155b-00 Guide

Overview

Key Features

Physical & Installation

Regulatory & Safety

Deliverables

If you want this as a product spec sheet for a particular Nissan model/year or need wiring pinouts, tell me the model and year and I’ll generate a tailored spec.

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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). nissan p155b-00

Based on the diagnostic trouble code (DTC) format, P155B-00 is a manufacturer-specific code used by Nissan and Infiniti vehicles.

Here is a detailed breakdown of the code, its meaning, causes, and diagnosis.

For 90% of cases, the fix is replacing the coolant bypass valve assembly. Here’s how to do it:

Compare actual coolant temperature with the valve’s commanded position. If the engine is at 200°F and the valve shows 0% open, replace it. Overview

⚠️ Important: Do not attempt to repair the IPM internally — the hybrid inverter contains high-voltage (up to 650V DC) and can cause serious injury or death. Always de-energize the high-voltage system before any work.

To give you a more specific answer:
What is the exact year, model, engine, and transmission of your Nissan?
Also, is this a hybrid or conventional gas vehicle? That changes the diagnosis significantly.

If you own a modern Nissan vehicle—especially models like the Rogue, Altima, Sentra, or Pathfinder—and your check engine light has just illuminated, you might be staring at a code that reads P155B-00 after a scan. Unlike common oxygen sensor or misfire codes, this one often leaves drivers and even some novice mechanics scratching their heads.

So, what exactly is Nissan P155B-00? Is it serious? Can you still drive your car? And most importantly, how much will it cost to fix? Key Features

In this complete guide, we will break down every aspect of the P155B-00 code, from its technical definition to step-by-step diagnostic and repair procedures.