Nissan | P155b-00

: The check engine light will illuminate on the dashboard, occasionally paired with an eco-mode or start-stop system malfunction light.

While the car remains drivable, it will likely fail emissions tests and experience decreased fuel economy until fixed. 🚦 Common Symptoms Check Engine Light (CEL): The most obvious sign. Poor Fuel Economy:

Use a wire terminal brush to scrub away all oxidation from the battery post and inside the clamp.

: High resistance on the main chassis ground or the ECM ground terminal mimics a power supply fault.

When this code triggers, the driver will usually notice a combination of electrical and drivability symptoms: nissan p155b-00

In some cases, specialized "VGT cleaner" can be used to break down soot without removing the turbo.

Internal electronic failure of the turbo control motor.

Over time, critical engine sensors accumulate carbon buildup, oil mist, or environmental debris. When sensor faces become coated, their response times drop, and they fail to send accurate real-time data to the ECM. 2. Wiring Harness and Connector Damage

: If the sensor fails the resistance test, replace it. Always source original equipment manufacturer (OEM) components or high-tier equivalent sensors; lower-quality aftermarket sensors frequently trigger recurring codes due to incorrect internal resistance. : The check engine light will illuminate on

If you also see codes or P155F , Nissan service manuals recommend fixing those first, as they are often the "root" cause that triggers the P155B-00 secondary fault. 4. Clear the Code and Test

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

"Check Engine" or "Drivetrain Malfunction" alerts. Smoke: Excessive black smoke from the exhaust under load. Common Causes

Inspect the rod between the actuator and the turbo. Ensure it moves freely and isn't bent. Poor Fuel Economy: Use a wire terminal brush

A: No. Bypassing the sensor will result in the ECM having no data on battery state-of-charge. This will likely cause a continuous fault code and force the alternator to operate in a default "safe mode," which typically results in constant high charging, wasting fuel and potentially overcharging the battery.

A variety of electrical weak points can trigger this code, usually revolving around the vehicle's 12-volt starting battery or its measurement sensors:

A short in the circuit may have tripped a fuse in the engine bay fuse box. Poor Grounding: Corrosion at the ground points for the engine harness. ✅ Recommended Fixes Inspect the Wiring: