Nissan P155b00 -
appearing intermittently on the dashboard.
[Inspect Terminals & Grounds] ──> [Test Battery & Charging] ──> [Check Wiring & Voltage] ──> [Replace Current Sensor] Step 1: Visual Inspection and Terminal Maintenance Before buying parts, check the battery connections.
$150–$400 for a used module vs. $3,000–$6,000 for a whole new pack.
The diagnostic trouble code (DTC) is a manufacturer-specific automotive fault code that primarily points to a malfunction or learning deviation within the electronic throttle valve system or cruise control/ASCD sub-circuits . In modern Nissan vehicles, the suffix "00" indicates a generic sub-type fault, meaning the Powertrain Control Module (PCM/ECM) has detected a baseline operating parameter that has fallen out of its designated calibration range. Technical Definition of P155B00
Any present during the scan (such as U1000) nissan p155b00
This feature continuously monitors the high-voltage battery pack’s internal resistance, temperature gradients, and historical discharge patterns. When the system detects minor cell imbalances (code P155B00 would indicate “Battery Pack Harmonic Drift Detected”), it automatically initiates a silent rebalancing phase during normal driving or charging.
: Locate the shutter behind the front bumper, disconnect the wiring harness, and inspect for green corrosion or bent pins. Perform an Active Test
Code is an annoying but non-critical fault related to the efficiency systems of the vehicle.
If the alternator is not charging properly, the system can enter a protective state, triggering this code. Symptoms of a P155B00 Code appearing intermittently on the dashboard
Start the car when the engine is completely cold. Safely pass your hand near the exhaust manifold connections, flanges, and gaskets (without touching the metal) to feel for escaping air. Even a tiny exhaust pinhole upstream of the sensor introduces outside oxygen, throwing off sensor latency readings. 3. Perform a Multimeter Test
If the wiring and battery check out fine, the battery current/voltage sensor itself is often the point of failure. Disconnect the negative terminal, unbolt the old sensor module, fit the new OEM replacement, and secure the connections. Perform a Self-Learning Reset
A: Temporarily. But the code will return within 10–20 miles of driving if the physical resistance imbalance remains.
(e.g., system voltage dropping to 12.0V or spiking past 15.0V while driving). $3,000–$6,000 for a whole new pack
: If the motor is dead or slats are broken, the most common fix is replacing the entire active grille shutter unit. replacement part to resolve this?
If you choose to have a shop diagnose the code, expect to pay between $50 and $180 for diagnostic time, depending on the shop's hourly rate and the complexity of the issue. Many shops will apply some or all of the diagnostic fee toward the final repair cost if you authorize the work.
Because this is a specific Nissan code, professional diagnostic equipment is recommended. However, you can check the following:
To understand this code, it helps to break down the alphanumeric format used by modern vehicle systems:
