2020 Jeep Wrangler: start-stop system problems

Filed Aug 11, 2026 · Electrical, Engine · NY

While driving on the highway, the check engine light illuminated. Approximately 5 to 10 minutes later, the battery warning light came on. Upon exiting the highway and coming to a stop at an intersection, the automatic engine Start/Stop system engaged and shut down the engine. When attempting to safely proceed, the vehicle suffered a complete electrical failure due to the 48V mild-hybrid eTorque system failing to restart the engine. The vehicle refused to crank, would not shift, and became entirely disabled and stranded in the middle of a live intersection, creating an extreme safety and collision hazard. The vehicle was towed to an authorized dealership, where technicians officially confirmed the failure. The dealer diagnosed the root cause as an internal electrical failure of the Motor Generator Unit (MGU / Belt-Driven Hybrid Starter Generator Assembly), which completely disabled the vehicle's charging and hybrid restart capabilities. The failed component is available for inspection.

Filed Sep 10, 2024 · Electrical, Engine · NV · fire

Unknown what started the issue. While driving it, service electronic control dash light went on. The vehicle started losing power. We were able to get to the highway shoulder. Other dash lights were going on as we were moving over. Immediately after putting it in park and turning the vehicle off, smoke started billowing out from the hood. The vehicle engine was on fire and it was completely destroyed. The only on-going issue we had with it was auto start/stop with both auxiliary and main battery having to be replaced twice over the course of 4 years. There was an active recall for fuel pump component and we were on a waiting list for parts from the dealer since Sept 2023 and we were still waiting.

Filed Sep 3, 2023 · Electrical, Steering · AL

Randomly the check engine light will appear and the dash will display multiple messages about service needed for traction control, stability control, auto start stop disabled, service cruise control etc. Then while driving you will lose power steering and this almost caused my daughter to wreck while trying to finish a turn. Additionally when the messages appear the vehicle will not have the ability to shift so you can not reverse and once it shut off in the middle of the highway blocking traffic and almost caused multiple accidents. The dealership has replaced the battery sensor and said it was fixed. I was told to replace the primary and secondary battery to ensure it was not a battery problem and I did, however the issue still remains. Looked online for others with this issue and there are many with the exact problem. The Jeep will report the transmission temperature and oil temperature incorrectly with the gauge maxed out even if it has sat overnight. Additionally it also says to service the transmission.

Filed May 16, 2023 · Electrical · FL

After having the steering damper replaced for the death wobble on my 2020 Jeep Wrangler, a week later I was driving my jeep down the road and the vehicle stalled out on me. The auto start/stop light turned on and the car stalled out in the middle of a busy roadway in drive and would not go into park. After getting it into park, several lights turned on my dash, including “service power steering” and “service electronic stability control. My shifter lights all began flashing at once and my windshield wipers began to go while they were turned off. The vehicle would also not go into N and after finally getting it into neutral, we had to hold the emergency neutral pull while steering across 4 lanes of a busy roadway. This is now the second major safety issue (1st is death wobble) i’ve had with my jeep and no recalls have been issued. My car is at 42k miles and a lease, these cars should not be having these issues so early! It has now been at Jeep for a week and they have yet to look at the vehicle and keep giving me the run down of “we haven’t been able to look at your vehicle but it doesn’t look good” Jeeps seem to have major safety issues lately.

Filed Dec 9, 2022 · Engine · 24,000 miles · AZ

The contact owns a 2020 Jeep Wrangler. The contact stated while coming to a stop at a stop sign or red light, the Stop/Start feature failed to function. No warning lights were illuminated. The vehicle was taken to a local dealer, where it was diagnosed that a diesel exhaust component needed to be replaced because of a leak. The vehicle was repaired; however, the failure persisted, and the contact stated that the Stop/Start feature was not displaying as active. The vehicle was then taken back to the dealer, where it was diagnosed that the auxiliary battery needed to be replaced. The vehicle was repaired; however, the failure recurred. The manufacturer was made aware of the failure. The approximate failure mileage was 24,000.

Filed Oct 5, 2022 · Electrical, Engine · 45,000 miles · MI

The contact owns a 2020 Jeep Wrangler. The contact stated that while driving at an undetermined speed, the vehicle stalled. While using the Stop/Start feature, the vehicle stalled while in drive. The vehicle was restarted. The contact stated that several unknown warning lights were illuminated. The vehicle was taken to the local dealer, who informed her that the battery would have potentially exploded if she had continued to drive the vehicle. The mechanic noticed that the battery was smoking. The vehicle was diagnosed and the contact was informed that the batteries needed to be replaced. The vehicle was not repaired. The manufacturer was notified about the failure but no additional assistance was provided. The failure mileage was approximately 45,000.

Filed Aug 8, 2020 · Transmission · 2,500 miles · NY

2020 jeep wrangle jl with less than 3000 miles will periodically lose acceleration and not go past 3 gear. This has happened multiple times after driving for a bit and attempting to accelerate from a red light or stop sign. I have noticed if you turn off the vehicle and back on, it seems to fix the problem but the unexpected loss of acceleration and ability to reach normal operating speed has put me in danger situations numerous times. Not sure if it is related but I also noted that the auto start/stop warning light was on the last time it happened.