In December 2025, my check engine light came on. Diagnostic codes read P0128 (coolant thermostat) and U1467 (module communication). I took the vehicle to a mechanic, who diagnosed and repaired the issue. Shortly after, the check engine light returned, so the same mechanic replaced the ECM (plug and play). This repair did not resolve the check engine light. The mechanic recommended I take the vehicle to a dealership and identified a related service bulletin tied to Safety Recall N25 / NHTSA Campaign 13V-177...
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(three-way coolant valve). To confirm this diagnosis, I sought a second opinion from another independent mechanic. That shop purchased the coolant valve part directly from a dealership, installed it on my truck, and the same issue persisted. They also were unable to resolve it and advised me to take the vehicle to a dealership. I researched NHTSA Campaign 13V-177 (Chrysler Manufacturer Campaign N25) and confirmed that Chrysler recalled certain 2013 RAM 1500 trucks built between June 25, 2012 and December 12, 2012, because the coolant bypass valve may stick in a position that prevents coolant flow to the heater core. The official remedy for this recall is replacement of the coolant valve along with an updated module calibration, performed by a dealer. I was told by dealership staff that there is no active recall on my vehicle. However, my truck matches the affected description, and I have not had the calibration portion of the recall remedy performed, only the physical part replacement, which two independent mechanics have already completed without resolving the underlying issue. My vehicle is currently at Landmark Dodge in Morrow, GA. Despite this being an open federal safety recall (13V-177/N25) with a remedy that includes a required software calibration update, the dealership is attempting to charge me for this repair, even though I have already paid to have the physical part replaced twice by independent mechanics.