2020 Ram 1500: start-stop system problems

Filed Apr 17, 2025 · Electrical, Engine · MS

Driving down the road, my auto start stop failure light appeared on dash, followed by a check engine light and a battery light. Tried to pull over on the side of the road when I lost all electrical components including power steering, ac, radio etc. the truck slammed itself into park abruptly and turned itself off. I was stranded on the side of the road and nearly got hit by passing cars several times as I was in a curve in the road. After further investigation it has been determined that the bearings inside of the generator (part number: 68623194AB) went out. The part needed to fix the truck is not being made by the supplier and I have been nearly 2 months and counting paying for a truck to sit and look pretty as the truck is completely unusable. One dealership told me this part was on back order for over Five thousand customers.

Filed Apr 8, 2025 · Transmission · MT

The motor generator has effected the ess (engine start stop) system and at a stop it does not restart the vehicle when you let off the brake. It startes and then jumps forward creating a safety hazard if there is a vehicle in front of you or a pedestrian in the crosswalk. This is a concern that seems to happen with this system frequently through web searches that I have seen. My truck is at a dealer now to diagnose the problem with the system.

Filed Dec 1, 2024 · Acceleration, Transmission · IL

The truck has an issue with 3rd gear. It wants to jolt forward and if it doesn’t catch speed it goes into “limp” mode. It’s a safety feature where it goes as fast as 2nd gear needing service to Electronic throttle body, stop/start system, and electronic stability control.

Filed Aug 5, 2023 · MI

Dash will occasionally flash stop/start unavailable. Second incident yesterday happened while at a red light. Start/stop went unavailable and vehicle stalled and applied parking brake. Both incidents were while stop/start had been on and after releasing the brake. I see there is an open recall for this on the 2021 models. My vehicles build date is June 2020 seems and fall under the timeline for the 21 models but no recall for my vehicle

Filed Jul 11, 2021 · Engine · OK

Vehicle engine shuts off unexpectedly while in operation. Can happen in any condition: idling, accelerating, cruising or coasting. If at a slow speed (less than 5mph) vehicle activates emergency breaking then shifts itself into park. Can happen WITH or WITHOUT “Auto Start/Stop” being activated (fuel saver). When emergency breaking enacted, I’ve almost been rear-ended by trailing car. This issue has been reported on driver forums.

Filed Jan 12, 2021 · Electrical · 30,000 miles · CA

Tl* the contact owns a 2020 ram 1500. The contact stated while he was at a stand still at traffic light, the vehicle stalled. The contact stated that the auto start stop warning light was illuminated. The contact stated he was able restart the vehicle to drive to his destination. The contact stated he had experience the failure on 3 separate occasions. The vehicle was taken to the local dealer mullahey chrysler dodge jeep ram (2520 golden hill rd, paso robles, ca 93446, (805) 369-2400) where it was diagnosed with needing the steering column module to be replaced. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 30,000.

Filed Nov 30, 2019 · Brakes, Electrical · 737 miles · WA

On november 13, 2019 at 6:00pm pst while traveling 70mph westbound on interstate 90 at the sr18 interchange the vehicle experienced multiple serious safety defects and major systems failures due to loss of electrical power. Light conditions were nighttime, traffic was light, weather was clear. Electronic failure messages began to appear on instrumentation panel approximately 20 minutes prior to the total electrical failure: navigation, stop/start, climate control, uconnect, sirius radio, adaptive cruise all ceased function with no driver ability to control these systems well prior to the total shutdown. At total shutdown, with the vehicle still traveling at 70mph, the following additional events simultaneously occurred: 1.total failure and complete loss of power steering, 2.total failure and complete loss of power brakes, 3.total failure and complete loss of headlights, turn signals, and hazard lights 4.total failure and complete loss of all dashboard and u connect instrumentation, 5.total failure and complete loss of all steering column and dashpanel controls 6.total failure and complete loss of adaptive cruise control, 7.total failure and complete loss of electronic lane assist. 8.total failure and complete loss of electronic parking brake this ended with the vehicle being safely pulled to the shoulder of the freeway. When stationary, the vehicle lost nearly all power; there was just enough remaining power to randomly illuminate displays and uconnect in arbitrary flashes; giving the dashpanel the appearance of a nightclub. The vehicle was then towed to the selling dealer.