Nissan P155b-00 Jun 2026

Turn the key to ON and verify the presence of reference voltage feeding the sensor terminal. Step 4: Perform a Battery Management System (BMS) Reset

Moisture and dirt can compromise the electrical plugs, leading to high resistance and faulty voltage signals to the ECM.

The Nissan P155B-00 code is an indicator that your engine’s air management or emissions loop is compromised. While carbon buildup is often the primary antagonist behind this error, checking the integrity of the wiring and electrical connectors first can prevent you from spending money on unnecessary replacement parts. Addressing this code promptly ensures your Nissan retains its fuel efficiency, passes emissions checks, and delivers the reliable performance you expect.

: Fluctuations in engine idle speeds, particularly when stopping or shifting gears.

Use a digital multimeter to test the resistance of the actuator motor or the temperature sensor against the manufacturer specifications found in your vehicle’s factory service manual. If the component's internal resistance is out of specifications (infinite resistance indicates an open circuit), the component must be replaced. Step 5: ECM Reset and Realignment nissan p155b-00

To properly diagnose your Nissan and locate the fault, follow this logical diagnostic progression: Step 1: Scan and Record All Stored Codes

For 90% of cases, the fix is replacing the coolant bypass valve assembly. Here’s how to do it:

: Because the computer can no longer guarantee battery capacity, it will disable the fuel-saving stop-start feature as a precautionary safety measure.

Internal electronic failure of the turbo control motor. Turn the key to ON and verify the

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Run a digital battery conductance tester to check both and Cold Cranking Amps (CCA) . A battery with a healthy voltage but degraded internal plate structure will instantly trigger energy management faults. Step 2: Clean the Negative Terminal Sensor Assembly Inspect the negative battery terminal.

: The alternator engages at maximum capacity when you lift your foot off the accelerator or hit the brakes, converting kinetic energy into electrical energy.

Pop the hood and examine the negative battery terminal. Look for any green or white powdery corrosion blanketing the terminal sensor plug. Disconnect the battery terminals (negative first). While carbon buildup is often the primary antagonist

When P155B-00 is logged in the ECM, the vehicle often displays notice or performance limitations:

It seems you're asking about the , which typically indicates a problem with the Glow Plug Control Module or its circuit in diesel models like the Nissan Navara , , or .

The P155B-00 code is a manufacturer-specific diagnostic trouble code defined by Nissan. The base code typically indicates a Variable Swirl Control Valve (SCV) Control Circuit Range/Performance issue or an Exhaust Gas Recirculation (EGR) Temperature Sensor circuit malfunction, depending on your specific Nissan model, year, and engine type (such as the 1.5 dCi diesel or specific gasoline direct-injection engines).

The Intelligent Power Distribution Module Engine Room (IPDM E/R) regulates the relays and fuses handling high-current transfers. A blown system fuse or sticking micro-relay linked to the alternator's field circuit can cut off communications entirely. Step-by-Step Diagnostic & Repair Procedure

Using a multimeter: