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Nissan P155B00: Understanding This Hybrid Battery Code, Symptoms, and Fixes

If you own a modern Nissan hybrid—such as the Nissan Note e-POWER, Serena e-POWER, X-Trail Hybrid, or the Infiniti QX60 Hybrid (which shares Nissan’s architecture)—you might eventually encounter a cryptic code on your diagnostic scanner: P155B00.

Seeing a new code can induce panic, but knowledge is power. In this deep-dive article, we will explain exactly what the P155B00 code means, why it appears, the most common symptoms you’ll notice, how to diagnose it correctly, and the steps to fix it—without replacing the entire hybrid battery if possible. nissan p155b00

Fix #1: Clean and Tighten Connections (Cheapest – Often Works)

If corrosion or loose bus bars are the cause: Remove each bus bar

• Remove each bus bar.
• Clean contact surfaces with a battery terminal cleaner or fine-grit sandpaper.
• Apply a thin layer of dielectric grease or conductive anti-corrosion paste.
• Re-torque bolts to factory spec (typically 5–8 Nm).
• Clear codes and perform a "BMS Reset" via the scan tool.

Success rate: ~40% if caught early.

Step 3: Voltage Drop / Circuit Testing

(Refer to the specific model Year/Engine Wiring Diagram for pin locations) Success rate: ~40% if caught early

1. Disconnect the Negative Terminal: Wait 10 minutes for capacitors to discharge.
2. Inspect the Sensor Ring: Remove the sensor from the post. Check for physical cracks or carbon tracking.
3. Check Reference Voltage: With the sensor unplugged and the vehicle running (if possible) or key ON:
   • Check for 12V supply (Battery Voltage) at the sensor connector.
   • Check for a good Ground.
   • Check the Signal wire for continuity to the ECM.
4. Sensor Replacement: If power and ground are present at the connector, but the code persists, the sensor is defective.

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What is Nissan P155B00?

P155B00 is a manufacturer-specific Diagnostic Trouble Code (DTC) for Nissan hybrid vehicles. It translates to: "Hybrid Battery Pack Internal Resistance Abnormal (Module Imbalance)."

In plain English, your Nissan’s onboard computer (the Hybrid Vehicle Control ECU or HVCM) has detected that the internal electrical resistance within one or more of the battery modules has deviated too far from the expected range compared to the other modules.