2021 Ram 1500 fuel/propulsion system problems

“My 2021 Ram 1500 EcoDiesel previously had the federal high-pressure fuel pump safety recall completed (Recall Z96 / NHTSA Campaign 22V767000) on February 12, 2024, where remedy part CSSMZ461-AA was installed. Recently, the vehicle suffered a complete loss of motive power due to a sudden, catastrophic internal failure of this replacement fuel pump. The dealership service department has officially diagnosed the truck and confirmed that the replacement fuel pump blew up internally, sending metal shards throughout the entire fuel system and requiring a complete $9,080 replacement of the fuel loop. This is a complete failure of a federal safety recall remedy, duplicating the exact highway stalling hazard the recall was issued to fix. Stellantis/FCA must investigate why these replacement remedy pumps are continuing to fail and creating dangerous conditions for drivers.”

“This vehicle was subject to NHTSA Recall 22V-767 / Stellantis Recall Z96 for a defective Bosch CP4.2 high-pressure fuel pump (HPFP) known to fail and release metal debris into the fuel system. The recall remedy (HPFP replacement) was performed at an authorized Stellantis/Ram dealership on 3/29/2024. On 8/9/2026, while driving the vehicle suddenly lost engine power and blocked the road in the left lane. The vehicle failed to restart and needed to be towed. The vehicle was independently inspected at Saddleback Automotive Service Center, Santa Ana, CA (RO# 130026). The technician documented diagnostic trouble codes P0087 (fuel pressure governor deviation, low pressure), P025C (fuel pump module control circuit low), and P016F (closed-loop fuel pressure control at limit, pressure too low) — all consistent with the same CP4.2 HPFP failure mode the recall was intended to remedy. Photographic and video documentation confirms metallic contamination in the engine oil and fuel filter screen. This failure occurred more than two years after the recall repair, and Stellantis (Case #97888077) has denied consequential-damage coverage citing the standard 24-month Mopar parts…”

“My 2021 RAM 1500 ecodiesel was subject to an NHTSA recall (23V-263). The recall included a replacement High pressure fuel pump (HPFP) due to a mechanical defect in the Bosch CP4.2 high-pressure fuel pump (HPFP) that causes the pump to fail prematurely and destroy itself internally. The HPFP was replaced under the recall over two years ago, only for the new fuel pump to fail catastrophically and send parts through the fuel loop. The failure has been confirmed by a manufacturer dealership service center (Huntington Beach, CA). The failure lead to immediate engine shutoff while driving in traffic. The vehicle could not be moved out of a busy street under its own power. There were no warning signs prior to failure.”

“The vehicle experienced an overheating condition immediately after being picked up from dealership service on April 11, 2026. Within a short distance of driving, a warning appeared and the vehicle became unsafe to operate, requiring it to be pulled over and towed. The dealership later stated that coolant was low but also reported no leaks. This condition should have been identified and corrected while the vehicle was in their custody prior to release. The failure created a safety risk because the vehicle could not be operated safely on the roadway and required immediate removal from traffic. The issue occurred without prior warning before the failure following service.”

“Wa driving with cruise on at 60 mph. Truck stalled with no notice, no warning lights or check engine light. All temperatures and pressures seemed okay at time of incident. Could not move electronic shifter into neutral, was stuck in drive. Alarm came up to shift to park, I did not shift due to moving at 55mph at this time. Coasted to a stop on side of the road. At about 2-3 mph, truck automatically shifted to park. I attempted to restart truck but engine just cranked over with no fire. Attempted 3 times and still nothing. Waited 20-30 min and attempted again and same result. Call for tow truck and had towed to dealership. While waiting for tow truck, had full power in truck, no warning lights. Checked fuses for fuel and found no issues. Did hear fuel pump engage when turned ignition to run. Checked oil level, oil was changed 800 miles prior to incident, oil was at full level on dip stick.”

“I was suddenly unable to fill the fuel tank of my truck on the way back from a 4 hour road trip in freezing conditions. I was able to get just enough fuel into my vehicle to make it back due to it occurring during a fuel up on the last hour of the drive. However, if this had happened earlier in the drive, I could have been stranded with my family in freezing conditions. There were no warnings and it hadn't been happening prior, other than a half dozen times randomly over the past 2 years where the fuel station nozzle clicked off a few times prematurely. But never to the extent of not being able to fill the tank. It was brought to a dealership and is currently having the fuel tank replaced due to a bad valve inside of it.”