Nissan has decided to implement a voluntary service campaign to improve the cold start misfire monitoring of the engine. This adjustment to the 2013 model year GT-R's On-Board Diagnostics (OBD) system will help increase the protection to the vehicle and maintain the vehicle's emission system warranty. Nissan is conducting this voluntary service campaign to reprogram the Engine Control Module (ECM) at no charge for parts or labor. See this bulletin for further detail. Campaign ID# P2561
