P155b00 — Nissan

The car may not achieve its optimal MPG if the shutters are stuck open [3].

Disclaimer: Working on hybrid batteries involves high voltage (up to 400V DC). Always follow manufacturer safety procedures. If you are not trained, take your vehicle to a certified hybrid repair specialist.

Understanding the Nissan P155B00 Fault Code: Causes, Symptoms, and Complete Diagnostic Guide

You don’t always need a check engine light to know something is wrong. Here’s what you’ll typically experience when P155B00 is active: nissan p155b00

: You may notice a choppy or uneven idle, especially when idling at stoplights right after a cold start.

Often accompanied by other warning lights (ABS, ESP).

Once you’ve fixed the code, use these habits to keep it away: The car may not achieve its optimal MPG

: The engine cannot optimize the air-fuel mixture properly. Typical Causes

: Use an OBDII scanner to clear the code and see if it returns. Check Connections

While the car may drive normally, owners often report the following: If you are not trained, take your vehicle

Ignoring P155B00 can damage the entire hybrid battery pack. The healthy modules will be forced to overcompensate for the weak one, leading to a cascading failure. Continued driving also risks overheating the battery, which could trigger a failure of the high-voltage safety contactors (requiring a full pack replacement).

The Diagnostic Trouble Code (DTC) in a Nissan indicates a fault within the vehicle’s Electrical Energy Management Control system . Specifically, this manufacturer-specific code triggers when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects battery voltage or current readings that fall outside acceptable thresholds for a sustained period.

The Nissan P155B00 code, primarily related to the battery current sensor circuit, is a diagnosable and repairable fault. With the information provided in this guide, you are now equipped to make an informed decision about next steps. Whether you choose to diagnose and repair the issue yourself or take your Nissan to a professional, the key is to act methodically. Start with the battery, verify the wiring and sensor, and only then move toward more expensive solutions. By understanding the system and addressing the underlying cause rather than just clearing the code, you will ensure your Nissan's electrical system remains reliable for many miles to come.

Nissan diagnostic trouble code P155B-00 primarily indicates a performance issue with the Active Grille Shutter (AGS)