After servicing an automated transmission with a neutral interlock system, what safety precaution should be taken before attempting to start the truck?

Setting the park brake before turning the key "on" or attempting to start the truck is a crucial safety precaution when dealing with an automated transmission equipped with a neutral interlock system. The neutral interlock is designed to prevent the vehicle from being started unless it is in the correct gear. However, even with this system in place, ensuring that the park brake is engaged adds an additional layer of safety.

When the park brake is set, it prevents the truck from rolling, which is especially important if the vehicle is on an incline or if the transmission does not engage properly during the starting process. This practice reduces the risk of accidents or injuries caused by an unintended vehicle movement. It is a standard safety protocol in the prevention of possible hazards associated with starting vehicles under maintenance or after a service.

While checking electrical harness connections, verifying shift control panel lights, and clearing fault codes and reprogramming the transmission ECU are important steps in maintenance, they do not directly address the immediate safety concern of ensuring that the vehicle does not move unexpectedly upon starting. Setting the park brake is a direct action that enhances safety for the technician and anyone in the vicinity of the vehicle.