one Ram owner back in the spring removed the controller inspection cover and water poured out. The inside contacts were corroded that solder to the board. The controller itself appeared good, as it is coated in a protective plastic spray (Conformal coating). But the main terminals were badly corroded.
He said it appeared, to his eye, the water appeared to be entering on the tie rod boot end. But what could also cause water or condensation build-up inside the controller housing region could be a result of 'breathing'. In other words, when the assembly warms up during use ...from the EPS motor, controller heat and/or radiated heat from the radiator/engine, it could cause the air inside the EPS controller area to condense on warm areas either on the aluminum housing or the board itself. When the vehicle is parked and the EPS assembly cools, cooler (and more moist) air enters into the controller area. The process continues and repeated condensation results in moisture build up. Just like can happen in a dual-pane house window when the seal fails.
Other issues reported with Ram EPS units include being knocked out of kilter by a major pothole (knocked a tooth off??), and possible issues with the electric motor.
But the most common seems to be with the controller ..likely moisture build-up. Some have put a heat gun to the controller area on cold winter mornings and gotten the P/S to work (while it's warm).
