2020 Jeep Wrangler: check engine light

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 May 2, 2026 · Electrical · PA

The cam bus connector also known as the green star box behind the glove box was defective. I would drive 32-35 miles and my dashboard would light up with 17 codes, abs, 4wd, steering, anti skid, my speed would disappear as well as my mph into three dashes, my check engine light would eliminate as well as service 4wd, pull over to a safe location vechile disabled as the entire jeep slammed itself into park. I can’t imagine what would have happened to me if I didn’t get this resolved and I was going to work driving on the highway doing 55 and this happened and the vehicle slammed itself into park. I would not be here today to tell my story and potentially save other lives as I’m sure this is a known recall and or should be! I called jeep and was notified that this is a known recall but my vin was listed for the recall. So here I am in hopes to get this resolved for all jeeps out there to get this addressed. I would also like to be reimbursed for the parts and labor getting this fixed. I have the video footage of this happening as well and a pic of the cam bus fuse connector showing the burnt electrical components. This will not let me upload a video only photos.. the video is very important in this case and I feel you should have it for this, if so please email me or contact me and I can send it.

Filed Aug 28, 2025 · Electrical · FL

I woke up one morning about 2 months ago, and the dash cluster was not working and has not worked since. How was your safety or the safety of others put at risk? My safety and the safety of others are put at risk because I am unable to see critical information while driving, such as my speed, fuel level, and any potential engine warning lights. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes, the problem was confirmed by two different independent mechanics, both of whom stated that I need a new cluster. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No, the vehicle has not been inspected by the manufacturer, police, insurance representatives, or any other party besides the two mechanics. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No, there were no warning lamps, messages, or other symptoms before the cluster failed. The failure occurred suddenly.

Filed Jul 21, 2025 · Engine · AZ

Had to take my 2020 wrangler in to have accessory battery replaced as it had drained my newly purchased battery and my car wouldn’t start. Repair shop replaced both batteries and about a week later the check engine light came on for about 2 minutes then went off so I chalked it up to the battery replacement. It didn’t come back on again until about 3 weeks later when I started feeling a slip when going in to second gear. When I got home after having that issue I noticed a small collection of what looked to me like transmission fluid on my garage floor so I had the car towed to the repair shop again. They informed me that engine oil was mixing with coolant due to a bad oil cooler. Between that diagnosis and my car completely breaking down and cracking my engine block the car was driven a total of 14 miles at the most. There was never any other signs prior to me taking it to the shop that the oil cooler had gone bad and even when they replaced the batteries no codes came up for the bad oil cooler and nobody noticed anything while working in the area. . Since then I have learned that this has been an ongoing issue with the wrangler since at least 2012 models and there has been several class action suits that were settled out of court I’m assuming so they don’t have to spend the money recalling and repairing every affected vehicle and finding a fix for future models. Meanwhile I have only had my car for 2 years as of last week and now am being charged $15000 $8000 of which I have to pay up front to even find out how long the parts needed will be on back order. Could be a week could be a year. Not to mention that I have no car to drive and a car payment to make while I wait. This needs to be fixed as these cars are overheating out of nowhere and shutting down when it does. It’s a safety issue as well as a consumer issue.

Filed Jul 2, 2025 · Brakes, Steering · OH

One day, my check engine light came on but when I went to Auto Zone no issues came back. The light came on again a week later so I went back to Auto Zone (I attached the photo of the diagnostic they gave me). I went back to the Jeep Dealership and they said the next available would about a week later but I would be fine in the meantime. I unfortunately was not fine. I attached screenshots from the video of all the issues that popped up during the incident a few days later. My steering wheel locked up while I was driving. My car came to a complete sudden stop like it automatically went into park while I was driving. Then, the windshield wipers started going by themselves. My gas meter went down to E then back up and down. The car not go into park and it would not turn off by pressing the push start button. I had to call a tow truck because I could not move. It was very scary and extremely unsafe. My car has been at the same Jeep Dealership since then on June 17, 2024 with no updates and no repairs. I have been waiting in limbo. I have contacted higher management and even they have given me no answers.

Filed May 22, 2025 · Brakes, Electrical · 80,000 miles · UT · crash · 1 injury

The contact owned a 2020 Jeep Wrangler Rubicon. The contact stated that the battery and engine lights were illuminated. The vehicle was taken to the local dealer but was not diagnosed or repaired. The contact stated that while driving up a hill at 30 MPH, the vehicle became uncontrollable and went into oncoming traffic. The driver was depressing the brake pedal, but the vehicle failed to stop and crashed into a Toyota Tacoma and a Toyota Corolla. The contact sustained an injury to her knee, and medical attention was provided. The airbags deployed. There were no reported fires. A police report was filed. The vehicle was towed to a towing lot. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was contacted. The failure mileage was approximately 80,000. The vehicle was deemed a total loss by the insurance company.

Filed Apr 25, 2025 · Driver assistance, Engine · 124,000 miles · IL

The contact owns a 2020 Jeep Wrangler. The contact stated while driving 35 MPH and decelerating while approaching a stop light, there was misfire coming from the engine, and the traction control activated, causing the brakes to become inoperable. The check engine warning light was illuminated. The “Service START/STOP System” message was displayed. The vehicle was taken to the local dealer, where it was diagnosed and determined there were metal shavings in the oil. The dealer recommended an engine replacement. The vehicle was not repaired. The manufacturer was contacted, and confirmed there was no warranty or recall coverage on the vehicle. The failure mileage was approximately 124,000.

Filed Mar 31, 2025 · Engine · MN

The engine started to misfire due to bad components. The check engine light did not come on to indicate there was an issue until it was too late and the damage was done not only to the engine but other components as well. This was extremely dangerous as the issues resulted in loss of power while driving with my young children in the car as i had just picked them up from school. The vehicle has been inspected by a mechanic who believes that at this point the engine may need to be replaced entirely. My vehicle just passed 100,000 miles so is no longer covered by warranty and now I am stuck with over an $11,000 bill to replace my engine because it was built poorly to begin with, hence the class action lawsuit against Jeep for this particular motor.

Filed Feb 28, 2025 · Fuel system · TX

I am experiencing a recurring issue with my vehicle’s gas cap. The check engine light continues to come on due to the gas cap, and this has happened multiple times. This is the third occurrence this year, and despite ensuring that the cap is properly secured, the issue persists. I am concerned that this may indicate a defect in the gas cap or an issue with the sealing mechanism. I would appreciate any assistance in determining whether this is part of a known recall or if there is a recommended fix.

Filed Mar 22, 2024 · Brakes · MA

When starting my 2020 Jeep Wrangler all warning lights were flashing. I called dealership and they asked if the car could be driven. Eventually all of the lights went off except service engine and we were able to drive it to the dealer. They did a diagnostic check and could not identify the problem. They then reset the service engine light. One day later the same thing happened again shortly after starting and while we were driving. The car braked on its own without any notice while we were driving and everything started flashing again. We could not shift the car or move it. We decided to have it towed to the dealer. After 3 days they found that the ABS Module had to be replaced. Unfortunately these modules are back ordered for several months. I have no idea when my car might be fixed.

Filed Feb 16, 2024 · Engine, Fuel system · MI

An internal defect in the 2014-2020 Jeep Wranglers with the 3.6L Pentastar V6 engine affects its rocker arms, lifters, and related valvetrain components, including the engine control module (ECM) software that controls the precise timing and function of the lifters. Specifically, the rollers of a Pentastar engine’s rocker arms prematurely wear down, become loose, and then drop, which shifts the rocker arm out of alignment. The rocker arms then come into contact with the cam, scraping both components and creating metal debris. This Pentastar V6 engine defect creates an audible ticking sound that stems from metal particles and debris from the failed rocker arms and other components, contaminating the engine oil and circulating throughout the engine. This defect also causes engine misfires, resulting in bucking and surging, decreased engine performance, hesitation, loss of power, premature wear on internal components, and eventually catastrophic engine failure. The check engine light came on in my 2020 Jeep Wrangler with 69,000 miles. After having it read by a dealer, it showed the P219A code, Bank 1 air/fuel imbalance. The dealership told me that if the Jeep was running fine, I did not have to worry about it, as it was likely an O2 sensor. The code was cleared, and the P219A code returned the following day. It was driven approximately 500 miles before noticing that it began idling roughly and had an engine tick, which the dealership confirmed to be a valvetrain issue. The rocker arms, lifters, valves, and camshaft components of the Pentastar V6 engine in my 2020 Jeep Wrangler with 70,000 miles have failed. Three Jeep dealerships in my area and MANY online forums stated that this is a common occurrence with this engine, which has escalated my concern about this problem.

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.