The Ram Cummins ISB 6.7-liter turbodiesel engine, known for its power, faces common problems. Earlier models lacked diesel exhaust fluid, causing Diesel Particulate Filter (DPF) clogs, leading to power loss, harder engine cranking, fault codes, and reduced power mode. Turbochargers may fail due to high heat and speeds. Blown head gaskets can occur, leading to white exhaust smoke. Fuel dilution from DPF operation increases engine part wear. EGR valve and cooler issues arise with higher mileage, with costly replacements.
Duramax engines, renowned for their reliability, may encounter issues, especially after 160,934 kilometers. Glow plug problems, particularly in 2006 models, affect fuel efficiency and engine performance. Injectors, especially in 2001-2004 LB7 models, can lead to starting issues and misfires. Fuel system problems, like hard starting and lower fuel economy, are widespread. Water pump failures, typically at 128,747 kilometers, risk engine overheating and damage. Fan clutch problems in pre-2005 models can cause engine overheating. Faulty PCV designs in 6.6L Duramax engines may result in oil leaking into the turbocharger, potentially leading to severe engine issues. Regular monitoring can prevent major troubles.
Common problems in Gen 1 included radiator and coolant system leaks, glow plug issues (especially in 2011 trucks), oil leaks from the vacuum pump gasket, NOx sensor problems (addressed through a satisfaction program), turbocharger challenges (improved in later models), and faulty EGT sensors (mostly in 2012 models). Gen 2 (2015-2019) saw upgrades but had some EGR cooler, fan clutch, crankshaft damper, and turbo-related problems. Gen 3 (2020-2023) generally offered a more refined engine with fewer known issues. Regular maintenance and using compatible parts are essential for trouble-free operation.
The Ram EcoDiesel engine has experienced several issues, notably in earlier models. These include EGR cooler failures with coolant leaks, potentially leading to engine fires. Exhaust couplers in 2014-2015 models cracked, allowing exhaust fumes into the cabin. Timing chain and camshaft problems caused engine misfires and rattling. Some models faced oil cooler failures during heavy loads. Ram conducted recalls, particularly for EGR cooler problems. While these issues raised concerns, newer Ram EcoDiesel engine models have seen improvements to enhance reliability. Proper maintenance remains crucial to mitigate problems and extend engine life.
