Nissan P155b00 «RECOMMENDED – 2025»

TECHNICAL SERVICE PAPER: Nissan DTC P155B00

Subject: Battery Current Sensor Circuit Range/Performance Applicable Systems: Nissan Models equipped with Intelligent Battery Sensors (IBS) (e.g., Altima, Sentra, Rogue, Pathfinder, Leaf). DTC Description: Battery Current Sensor / Battery Sensor System Malfunction

Cost Breakdown (USD)

| Repair | Parts Cost | Labor | Total (DIY) | Total (Shop) | |--------|------------|-------|-------------|---------------| | Clean/Tighten connections | $10 (paste) | $100–200 | $10 | $110–210 | | BMS reset / balancing | $0 | $120–180 | Free (with scanner) | $120–180 | | Replace one module | $150–400 | $200–400 | $150–400 | $350–800 | | Full refurbished battery | $1,500–2,500 | $400–600 | $1,500–2,500 | $1,900–3,100 | | Full OEM dealer battery | $4,500–6,000 | $800–1,000 | N/A | $5,300–7,000 | nissan p155b00

Step 2: Battery Health Check

  1. Use a battery tester to verify the health of the battery.
  2. If the battery is dead or below 12.0V, charge the battery fully and clear the code.
  3. Restart the vehicle. If the code returns immediately, proceed to Step 3.

Repair Action 3: Wiring Repair

If testing reveals broken wires or high resistance in the harness: TECHNICAL SERVICE PAPER: Nissan DTC P155B00 Subject: Battery

  1. Repair the damaged section of the wiring harness.
  2. Inspect the connector pins for damage; replace the pigtail if pins are corroded.

2.2 Code Logic

The ECM sets P155B00 when:

  1. The signal voltage from the battery current sensor is lower or higher than the calibrated threshold.
  2. The ECM detects an open or short circuit in the sensor wiring.
  3. The internal processor of the IBS reports an internal fault.

Why is internal resistance important?

Lithium-ion (or NiMH) battery modules naturally have a small amount of internal resistance. Over time, connections can loosen, cells can degrade, or temperature differences can cause one module to behave differently. When one module’s resistance is significantly higher (or lower) than its neighbors, the battery pack can no longer charge or discharge evenly. This creates a "weak link" that reduces overall performance and can lead to overheating. Cost Breakdown (USD) | Repair | Parts Cost

The P155B00 code is triggered when the difference in internal resistance between the highest and lowest modules exceeds Nissan’s tolerance threshold (typically >50% variance).