Why is my Jeep Grand Cherokee check engine light on?
If the check engine light in your 2020 Jeep Grand Cherokee starts flashing, that means that the problem needs immediate attention and your Jeep should be transported in shortly. This blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system.
How do you reset the check engine light on a 2004 Jeep Grand Cherokee?
Step 1 – Reset your check engine light
- Disconnect the positive (red) battery cable.
- Ground the positive battery cable to negative (black) battery cable for around 30 seconds.
- Reconnect the positive battery cable.
- Turn your key into the “ON” position, but do not turn on the engine.
What can cause a engine light to come on in a Jeep Cherokee?
Back-up prevalent reasons for a Check Engine Light are a malfunction with the fuel injection system, faulty head gasket, dirty mass airflow sensor, damaged oxygen sensor, faulty emissions control part, or defective spark plugs to name a few.
What does the Check Engine light mean on a Jeep Grand Cherokee?
A flashing check engine light is your Jeep Grand Cherokee’s way of saying “I have a serious problem, don’t ignore me”. Most of the time, that serious problem is a misfire. This flashing light should not be ignored. When your engine is misfiring, it is dumping raw fuel into the exhaust.
What causes a Jeep Grand Cherokee to misfire?
Keeping in mind that any engine needs air, fuel, and spark for ignition, your Jeep Grand Cherokee’s fuel system can often cause the engine to misfire. It can run too lean or rich. Alternatively, there may not be enough fuel for proper combustion, or the fuel isn’t atomizing properly.
What causes the Check Engine light to flash?
The ignition system is the most common reason that the check engine light will flash. The ignition system consists of spark plugs, plug wires, and the ignition coil packs (older vehicles have a distributer that has the same function as coil packs). These parts work in concert to ignite the fuel in the combustion chamber at just the right time.