However, that is the limitation of the Check Engine Light – it won’t tell you what exactly is wrong nor what to do about it. If the electronic control unit detects that the data is out of factory specifications, the Check Engine Light illuminates telling you that there is a problem. The sensors are continually detecting conditions while sending data to the electronic control unit. When this happens, the Check Engine Light turns off, and you can leave the service center knowing that your Jeep issue was fixed.Įvery Jeep Grand Cherokee was designed with a high-technology performance monitoring system with a computer, and a series of sensors positioned strategically throughout the vehicle on its crucial systems. No matter what is the root cause of the Check Engine Light, we have the Jeep Certified Technicians and the certified service protocol to isolate the root problem and repair it as needed to restore factory specifications. Other common reasons for a Check Engine Light are faulty emissions control part, faulty head gasket, a malfunction with the fuel injection system, damaged oxygen sensor, dirty mass airflow sensor, or defective spark plugs to name a few. Wheels: 17x7.Jeep Grand Cherokee Check Engine Light FlashingĪlthough there are countless potential causes of an illuminated Check Engine Light, we know from years of providing Check Engine Light Diagnosis Service that there are several common causes including something as simple as a loose gas cap. Rear: Clayton Off Road 6-in springs and four-link brackets, custom four-link long arms Tires/Wheels Tires: 285/70R17 BFGoodrich KO2 Rear axle/differential: Dana 44A HD/Aussie Locker Suspension Front: Clayton Off Road 6-in dual-rate springs and crossmember, Bilstein 5100 shocks, custom radius long arms, Rough Country sway-bar disconnects, Bilstein steering stabilizer, Goliath Off Road 1-ton steering with Heim joints Transmission: Chrysler 42RE 4-spd automaticįront axle/differential: Dana 30/Limited slip General Vehicle: '04 Jeep Grand Cherokee Laredoīuild time: 3 months Drivetrain Engine: 4.0L Power Tech six-cylinder
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