Nissan P155b-00 Jun 2026

If you have this code, check your negative battery terminal first. If a mechanic recently changed your battery and did not reinstall the factory sensor correctly (or damaged it), that is the cause. If the terminal looks stock and undamaged, replace the Battery Current Sensor.

“You were right,” she said. “It just needed someone to listen.” nissan p155b-00

While you might be able to drive a few miles to a repair shop, continuing to drive with a stuck-closed bypass valve risks serious engine damage. Overheating can warp cylinder heads, blow head gaskets, or even seize the engine—all of which cost thousands to repair versus a few hundred for a valve replacement. If you have this code, check your negative