Ram 1500 start-stop problems

Filed Nov 5, 2026 · Transmission · FL

2026 Ram 1500 Rebel equipped with 3.0L Hurricane I-6. When Auto Start/Stop shuts the engine off at a stoplight, the engine restarts but on two occasions the vehicle has not responded to accelerator input. I have rotated the gear selector from drive to park and back to drive and the vehicle responded to throttle input. The condition has not occurred when Auto Start/Stop is manually disabled. Dealer inspected vehicle after first occasion but could not duplicate the condition and found no diagnostic trouble codes. Loss of acceleration after restart presents a safety concern when pulling into or crossing traffic.

Filed Nov 4, 2026 · Electrical · NC

**2025 Ram 1500 Warlock – Complete Electrical Shutdown During Automatic Start/Stop Restart** My 2025 Ram 1500 Warlock, equipped with the 3.0L Hurricane twin-turbo engine, has approximately 22,000 miles and is experiencing a serious safety-related malfunction involving the automatic start/stop system. When stopped at a traffic light or intersection, the automatic start/stop system shuts the engine off as designed. While my foot remains on the brake, the vehicle's electrical systems continue operating normally. However, when I release the brake to accelerate, the engine does not attempt to restart. Instead, the vehicle experiences a complete electrical shutdown, including the instrument cluster, infotainment system, and interior lighting. The transmission automatically shifts into Park, and the electronic parking brake engages. The vehicle remains shut down until I manually press the engine Start button. It then starts normally. There are no check engine lights, warning messages, or other indications of a problem before or after the failure. This malfunction creates a significant collision hazard because the vehicle becomes unexpectedly immobilized at intersections when traffic begins moving. Following drivers may reasonably expect the vehicle to accelerate when the traffic signal turns green. At approximately 1,000 miles, the vehicle previously displayed a battery-not-charging warning. An authorized Ram dealership replaced the auxiliary battery under warranty, and the warning disappeared. The automatic start/stop system operated normally more recently, but this shutdown malfunction has since developed without any known changes to the vehicle immediately preceding the failures. I am concerned that this condition could result in a rear-end collision or leave the vehicle immobilized in an active traffic lane. I am requesting that the federal safety agency investigate whether this is a safety-related defect affecting 2025 Ram 1500 vehicles equipped with the 3.0L Hurricane engine.

Filed Oct 27, 2026 · Engine · FL

When driving at slow speed with the auto stop/start turned off the engine will shut off and have to reset to park before it can restart. This doesn’t happen often and the dealership says it can’t duplicate it and there is no malfunction code in the data storage.My fear is this could happen in traffic and cause an accident.

Filed Oct 21, 2026 · Electrical, Engine · ME

The vehicle experienced a sudden powertrain failure at a busy intersection failing to automatically restart during an auto start/stop cycle on October 6, 2026. Upon manual override, the mild hybrid motor generator unit (MGU failed to adequately charge the 48V/12V electrical systems. This failure leaves the driver highly vulnerable to a total high-speed vehicle stall in active traffic due to rapid battery depletion. The manufacturer and dealership is unlawfully denying federal coverage for this emissions/hybrid component. At the time of the incident the vehicle had approximately 59,248 miles on it. I called the dealership (as I believed this would be covered under the 60,000 mile powertrain warranty) that day describing the failure. The earliest appointment I could get was October 16th. By the time my truck went in for the appointment the mileage was 60,130 miles. The dealership Identified the failure as the charging system for the Ram Hemi E-Torques motor. Specifically the Serpentine Belt Tensioner Part #: 05281543AD, 05281956AA, and 68518738AA. Also prescribed a software update. The total quote for the repairs was 1534.80. The dealership denied warranty coverage under the powertrain stating the vehicle had exceeded 60,000 miles. I showed them a picture of my odometer at 59,248 miles dated for the day i reported the problem and scheduled the appointment. They then informed me that standard accessory parts (belts, tensioners, etc.) are not covered under the 60,000mile warranty. They also informed me they are not covered under the 80,000 mile emissions warranty either despite their failure resulting in a complete failure of the federally mandated emissions system. The dealership indicated approximately 30-40 codes were triggered during the incident including a system code for the MGU. I requested a record of these codes and the dealership is unable/unwilling to provide.

Filed Oct 19, 2026 · Electrical, Engine · IN

What component or system failed or malfunctioned, and is it available for inspection upon request? PCM, Auto Start-Stop System (based on what I was told by the RAM dealership and paperwork) How was your safety or the safety of others put at risk? When coming to a complete stop at an intersection, the vehicle stalled and shut down entirely, and the vehicle automatically shifted to park. Vehicle was able to be restarted only after pressing the brake, pressing the ignition button, and manually shifting into drive. This could have caused a collision if I was in stop-and-go traffic in a busier area, because I did not know how to respond to the vehicle randomly stalling to begin with. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. RAM dealership was able to replicate. Service advisor told me there was a Technical Service Bulletin released on 10/6/26 that addressed vehicle stalling due to the PCM and auto start-stop system. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No. This has only been inspected by Academy Chrysler Dodge Jeep Ram in Tipton, IN Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There were no warning lamps, messages or other symptoms of the problem prior to failure. After the third time the vehicle stalled, the check engine light illuminated. This vehicle was then towed to the dealership for inspection.

Filed Oct 12, 2026 · Acceleration, Transmission · FL

Vehicle: 2024 Ram 1500 Big Horn – 3.6L V6 eTorque Approximate mileage: 41,400 miles I am submitting this complaint regarding multiple incidents involving unexpected engine RPM increases, abnormal acceleration, and delayed throttle response following activation of the Auto Start/Stop system. On two separate occasions, while accelerating, the engine RPMs unexpectedly increased to approximately 3,000–4,000 without a corresponding increase in vehicle speed. The truck felt as though the transmission was temporarily disengaged or in neutral. I had to release the accelerator to allow the RPMs to return to normal. On October 11, 2026, I experienced another concerning incident while stopped at a stop sign preparing to make a right turn. The Auto Start/Stop system had shut off the engine while I was holding the brake. When I released the brake pedal, the engine restarted immediately. However, when I lightly pressed and held the accelerator, the vehicle did not move, and the engine RPMs did not increase. It felt as though the vehicle was being held in place despite my foot being off the brake. After approximately 2–3 seconds, the vehicle began moving normally without me releasing or pressing the accelerator again. No dashboard warning lights or error messages appeared during these incidents. Approximately three days before the latest incident, I brought the vehicle to an authorized Ram dealership and reported the concerns. The dealership performed diagnostic checks and a road test but informed me that no diagnostic trouble codes were found and the problem could not be reproduced. I was advised that my concerns were documented in their records. Despite the dealership inspection, the vehicle experienced another malfunction. I am concerned that these intermittent issues could result in a collision, particularly when entering intersections, merging into traffic, or accelerating from a stop. I am requesting that the federal safety agency review these incidents and investigate whether simila

Filed Oct 1, 2026 · Electrical · MT

On October 1, 2026, my 2022 Ram 1500 Rebel with the 5.7L HEMI eTorque mild-hybrid system failed to restart after an automatic engine stop-start event at a red light. The engine shut off as designed when I stopped. After about 90 seconds the light turned green and I released the brake, but the engine did not restart, and the truck sat motionless in the traffic lane. When I pressed the accelerator, the engine revved and the truck lurched forward unexpectedly. At that point a battery warning light and an auto stop-start warning (stop-start symbol with an exclamation mark) appeared on the dash. No warning lights appeared before the failure. I pulled over and was able to restart the truck, but the dash voltmeter read about 12.8V while running instead of the normal 14.4V, meaning the 12V battery was not being charged. I drove to my destination. After I shut the truck off and restarted it, voltage returned to about 14.4V. Note that this is not the first time this has occurred and I often keep the automatic start/stop off because it seems to have so many issues.

Filed Sep 29, 2026 · Brakes, Engine · MN

While going through an automatic car wash with the engine running, the transmission in Neutral, and my foot off the brake, my truck suddenly shifted into Park and shut off. When I tried to restart it, the display showed "Key Fob Not Detected," even though the fob was in my hand. It took several attempts before the truck restarted. Fortunately, the vehicle behind me did not hit me. This happened three more times before I made it out of the wash. I have since disabled the Engine Stop-Start feature and tried again, with the same result. The truck continues to shift into Park and shut off at random while in a car wash. This is a safety concern, and I would like it diagnosed and repaired.

Filed Sep 20, 2026 · Electrical · MI

This 2025 ram 1500 has an intermittent but serious safety defect that can cause a loss of power/stall during the automatic start/stop sequence, including while I am in active traffic or in an intersection. When the failure occurs, the truck may not restart or respond normally when I need to accelerate, leaving me stopped and exposed to cross traffic or rear-end impact. The vehicle has also displayed abnormal transmission/gear messages during start/stop operation, including prompting me to change the shift gear from park without me intentionally selecting park. This behavior is unpredictable and creates a real risk that the vehicle can become immobilized or enter an unexpected gear/shift state in traffic. I have taken the vehicle to suburban chrysler dodge jeep ram of garden city, michigan, four times for this same safety concern. The dealer has not repaired the condition, stating they cannot replicate it because it is intermittent. An intermittent defect that causes stalling or loss of propulsion in traffic is still a safety defect, and returning the vehicle unrepaired does not eliminate the danger. I am requesting that the federal safety agency investigate this condition on 2025 ram 1500 vehicles, including the start/stop, powertrain, transmission control, and related software/electronic systems. This vehicle has put me in dangerous situations multiple times, and I am concerned that a crash, injury, or death could occur if this defect is not identified and corrected.

Filed Sep 1, 2026 · Brakes, Electrical · FL

While operating the vehicle in heavy traffic (stop and go) conditions at about 10 mph the vehicle displayed an error message (STOP START RESET REQUIRED) shifted itself from DRIVE to PARK and applied the PARKING BRAKE uncommanded. Note that the auto stop start was in the ON position for several occurrences, but even with the automatic stop/start OFF the same anomaly occurred. These events happened during rush hour traffic on I95 in the express lanes as well as inside of an automatic car wash and during that instance it resulted on another vehicle striking mine from behind. To get the vehicle to move again required me to STOP the engine, switch to PARK, RESTART the engine and release the already applied parking brake.