Nissan P155b00 |verified| Jun 2026

To understand this code, it helps to break down the alphanumeric format used by modern vehicle systems:

Inspect the electrical connector at the shutter motor for signs of water entry or broken wires [2].

Until the sensor is hot, the engine runs in an "open-loop" mode, using a default, fuel-heavy rich mixture. This drops fuel economy by 8% to 12%.

I will cite the sources I have found, such as the Mitsubishi tech info page and the Nissan Rogue page. I will also reference the forum post about the Versa for model-specific issues. I will ensure the article is comprehensive and helpful for users. Nissan P155B00: Understanding and Resolving the Electrical Energy Management System Fault nissan p155b00

Start with a thorough test of the 12-volt battery using a multimeter and a load tester:

A has access to the latest factory diagnostic information, proprietary tools, and technical service bulletins, which can save time and reduce guesswork. In some cases, a Nissan dealership may offer goodwill assistance on repairs even if the vehicle is slightly out of warranty, particularly for known issues.

If cleaning does not resolve the issue:

Because this is a specific Nissan code, professional diagnostic equipment is recommended. However, you can check the following:

: The position sensor that tells the ECM where the valve is may be sending an incorrect signal.

According to official service documentation, the P155B00 code is set when: To understand this code, it helps to break

If P155B00 appears together with codes P155E and P155F , those codes should be diagnosed first. The service manual instructs: “If DTC P155B is displayed with DTC P155E and P155F first perform the trouble diagnosis for DTC P155E and P155F” .

Kenji laughed. “Ah, so she finally told you. That’s not a sensor problem. That’s her timing .”

This code is often triggered when there is a mismatch between the expected electrical load and what the sensor reports. Common causes include: Loose or Corroded Battery Terminals I will cite the sources I have found,

: You might see a battery light or a "System Malfunction" message on the dashboard.