NHTSA Complaint #11710625 — 2018 DODGE DURANGO

Over time, the valvetrain in my engine became gradually louder. Because there were no check engine lights or fault codes, I initially assumed this was a normal characteristic of the engine. That changed on January 2, 2026, when I began to hear a pronounced knocking/loud tapping noise accompanied by a cylinder 8 misfire. At that point, I stopped driving the vehicle and had it towed to a repair shop. Based on the symptoms, we initially believed the issue would be limited to a camshaft and lifter replacement. However, after draining the oil and cutting open the oil filter, a significant amount of metal debris was discovered. Further inspection revealed that one camshaft lobe had been worn down nearly smooth and the corresponding lifter had failed. When the camshaft was removed for full evaluation, all other lobes showed normal, even wear. Only the lobe associated with the failed lifter exhibited catastrophic damage beyond repair. As a result of the metal contamination throughout the engine, a full engine replacement was required rather than a repair of individual components. The basis of my complaint is that this failure appears to be a well-documented and common issue with the 6.4L HEMI engine equipped with MDS. I have since reviewed numerous reports and forum discussions describing nearly identical failures—often beginning with increased valvetrain noise, followed by a single-cylinder misfire and extensive internal damage. This was not the result of neglect or abuse, but rather a known failure mode that ultimately led to the complete loss of the engine.