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 the wiring is fine, the Glow Plug Control Unit itself may need replacing.
Understanding Nissan Diagnostic Code P155B-00: Energy Management Control Malfunction
If you actually meant P0155 (which is a very common O2 sensor heater code), that's a different story involving your exhaust and fuel efficiency.
: Headlights, dashboard clusters, and interior lighting may change brightness unexpectedly when the vehicle is idling or changing speeds.
The Nissan fault code typically relates to the Battery Heater Relay Circuit