There are 4 owner-reported engine complaints for the 2018 Ram ProMasterin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2018 Ram Promaster 2500. The contact received notification of NHTSA Campaign Number: 25V720000 (ENGINE AND ENGINE COOLING). The vehicle was started, and there was smoke coming from the exhaust pipe. The contact was unsure if any warning lights were illuminated. The contact took the vehicle to an AAA location and was informed to tow the vehicle to a dealer for assistance. The vehicle was towed to the dealer, where it was diagnosed that the low-speed radiator cooling fan failed to engage as designed, causing the engine to overheat. Due to the overheating, the engine became warped, causing a coolant leak into the cylinder, and causing escaped gases to enter the cooling system. The contact was informed that the engine and radiator cooling fan assembly needs to be replaced. The vehicle was not repaired due to the cost. The vehicle was towed to an independent mechanic, who replaced the engine and radiator cooling fan assembly. The manufacturer was made aware of the failure. The failure mileage was approximately 32,584.
Hello, my 2018 Ram Promaster is exhibiting the same symptoms as recall 44A: metal debris in the transmission, which could possibly impact the parking pawl I believe. I have experienced transmission issues for the past 12 months and the Ram dealer in Carson city has identified the same metal debris as seen in recall 44A for 2019-2021 vehicles. I respectfully request that the Office of Defects Investigation consider reviewing this complaint and evaluating whether the scope of the recall should be expanded to include my vehicle. Thank you for your attention to this matter. Please let me know if any additional information or documentation would be helpful.
Vehicle is experiencing misfires code P0300 and P0302. Performed the usual repairs listed: 1. Coil pack, 2. Spark Plug, 3. Injector. Inspected cam, rocker arms and lifters. All checked good. Codes still remain. After further inspection, the exhaust valve is cracked/broken on #2 cylinder. This appears to be an issue as many others are experiencing the same problem. This vehicle only has 86k miles, oil changed at scheduled intervals.
TL* THE CONTACT OWNS A 2018 RAM PROMASTER 2500. WHEN THE VEHICLE WAS STARTED, AN ABNORMAL KNOCKING SOUND WAS HEARD COMING FROM THE ENGINE. THE VEHICLE WAS TAKEN TO FRANK FLETCHER DODGE CHRYSLER JEEP (LOCATED AT 3314 STADIUM BLVD, JONESBORO, AR 72404, (870)277-2011) WHERE IT WAS DIAGNOSED THAT THE ENGINE NEEDED TO BE REPLACED. A SEPARATE OBD SCAN SHOWED THAT THERE WAS A MISFIRE ON CYLINDER NUMBER 2. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS INFORMED OF THE FAILURE. THE CONTACT WAS ALSO INFORMED THAT THE VEHICLE WAS OUTSIDE OF THE WARRANTY PERIOD. AS A RESULT, THERE WOULD BE A 48 HOUR PERIOD BEFORE A DETERMINATION WOULD BE MADE AS TO WHETHER ADDITIONAL ASSISTANCE WOULD BE OFFERED. THE APPROXIMATE FAILURE MILEAGE WAS 99,000.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026