The factory Ram 6.7L Cummins grid heater has a known failure point at the bolt and post connection. The quick check is simple: wiggle the 12-volt lead at the 10mm nut on top of the post. If the post jiggles, the bolt underneath is coming loose. That bolt can deform under normal use, then drop into the intake manifold and make its way to cylinder #6. At that point, this is no longer a nuisance issue. It is an engine damage risk. If the post moves, park the truck and have it inspected. If you want to remove the stock layout entirely, the Banks Monster-Ram Intake and Killer Grid Heater Upgrade replaces the factory intake elbow and grid heater arrangement with a high-flow intake plate and coil-heater approach, eliminating the stock grid-heater bolt risk from the airflow path.
Jay from Banks explains that the grid heater bolt can be checked quickly at the top of the intake area. The inspection point is next to the fuel rail, where a small 10-millimeter nut sits on top of a post. That post is connected to the 12-volt lead that runs back to the battery.
The test is simple: wiggle the electrical lead attached to that post. If the lead moves and the post jiggles with it, the bolt on the underside is coming loose. That movement is the warning sign Banks wants owners to look for.
According to the explanation, the problematic part is the post itself. It can deform and melt, and that failed piece is identified as the component responsible for the well-known grid heater bolt issue. The concern is not just looseness at the connection, but the progression toward physical failure of the hardware.
If the post and bolt assembly fails, the loose piece can fall into the intake manifold. From there, it can travel down to cylinder number six. That is the serious consequence behind the inspection advice, because once hardware enters the engine, the risk is no longer limited to an electrical or intake-system problem.
Banks' guidance is direct: if that post jiggles, do not drive the truck. The vehicle should be inspected and repaired before further use. The movement indicates that the underside bolt may already be loosening, which means the failure process is underway.
For owners who have the budget and want to eliminate the issue entirely, Jay recommends replacing the factory intake assembly. He describes swapping out the stock intake for a Banks Monster-Ram as the solution that removes this grid heater bolt problem at its source.