Nissan P155b-00 Jun 2026

Battery voltage measured by ECM is below or above the requested threshold.

The Nissan P155B-00 code is a specific diagnostic trouble code (DTC) that indicates a problem with the vehicle's throttle control system. This code is related to the throttle control actuator, which is responsible for controlling the throttle valve opening. In this article, we will provide a detailed explanation of the P155B-00 code, its symptoms, causes, and possible solutions.

Command the valve to open and close using a scan tool. You should hear a faint clicking or whirring. No sound = mechanical failure.

Measure the State of Health (SOH) and Cold Cranking Amps (CCA). If the battery fails or has weak cells, replace it. nissan p155b-00

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The P155B-00 code is commonly caused by an alternator that is not communicating correctly with the ECM or failing to produce sufficient voltage. Potential causes include:

A: If the code returns, re-check your work for any missed wiring issues. If the wiring is perfect, the next step is to have a dealer-level diagnostic scan performed to test the ECM or IPDM E/R for internal failure, though this is significantly rarer than a sensor or wiring issue. Battery voltage measured by ECM is below or

Are you experiencing any other issues like a or accessory lag? Has the vehicle recently had a new battery installed ? Share public link

Over time, the battery may suffer from chronic undercharging, leading to sluggish startups on cold mornings. Step-by-Step Diagnostic and Repair Protocol

In many Nissan applications (especially hybrids like the Pathfinder Hybrid, Infiniti QX60 Hybrid, or some newer e-POWER models), this code points to an issue with the inside the IPM (Intelligent Power Module or inverter) . In this article, we will provide a detailed

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

The exact rate of electrical current flowing in and out of the battery. The overall voltage state of health.