Q: What would make my check engine light come on this much?

asked by on November 05, 2015

I am at the end of my rope with my 2011 Jeep Grand Cherokee that always seems to have the Check Engine light lit up on the dashboard. For one reason another, with or without other symptoms, the light comes on often. I have had it serviced and reset 4 times now in the 39,000 miles I have driven it. This is not acceptable! Is my car a lemon?

Without specific information about your engine size and which engine codes have previously been reset, it is difficult to thoroughly diagnose the problem.

Using the 3.6L engine as a reference, I found that this engine may have issues with random misfiring, caused by possible cylinder leakage on the left cylinder head, that can cause the check engine to illuminate with or without symptoms.

Technical Service Bulletin (TSB) 09-002-14 dated December 15, 2014 specifies engine codes P0300, P0302, P0304, and P0306 as indicators of this issue.

If these codes appear during testing, I recommend calling your dealer because this TSB may include an extension of your warranty coverage for the test and repairs.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Clicking sound from tire

Hi! The sound you are describing is a common giveaway of a faulty CV axle. I suspect that the joint inside of the axle is binding up and is causing the noise. The joints on your particular vehicle may fail...

Car misfires when the weather is cold and while idling

Hello. Thanks for writing in about your 2000 Lexus SC400. It may be necessary to replace all of the ignition coils in addition to having the ignition coil wiring inspected for damage in order to determine why your engine is...

Why is it still misfiring?

Hi there. Check the Exhaust Gas Recirculation valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the engine....

Can you pass emissions with a turbocharged car with odb-2 if it did not originally come with a turbocharger?

Can you pass emissions with a newly turbocharged car that has ODB-2 that does not come with a turbocharger from the factory? It is illegal to modify any factory installed emissions system on a motor vehicle. Adding a...

Oil pressure repair cost, Oil Light comes on, and Check Engine Light is on - code P0022

Interior lights do not work - 1987 Jeep Grand Wagoneer

From your description, it sounds like a professional mechanic with great electrical diagnostic skills, like a certified technician from YourMechanic, will need to look at the vehicle, with or without a wiring diagram, to get to the bottom of the...

My temperature warning light is on, I've been parked for almost an hour to let the engine cool down. The temperature gauge cursor

The reason your heater was not working was because your engine did not have enough coolant in the engine to pump it into the heater system. You have overheated the motor now. You will need to find out when the...

Check Engine Light is on - code P0328

Hi there. A failure of the engine knock sensor is a somewhat risky issue with a turbocharged engine such as yours. Turbocharging increases cylinder pressure during operation and makes the engine more likely to experience "pre-detention" or knocking. The knock...

Location of crankshaft position sensor with pictures

Hi there. The crankshaft position sensor is located at the rear of the engine block near the transmission. Unfortunately I cannot send over any pictures. If you need to have your crank sensor replaced, consider YourMechanic, as a certified mechanic...

Related articles

P0086 OBD-II Trouble Code: Exhaust Valve Control Solenoid Circuit High (Bank 2)
P0086 P0086 trouble code definition P0086 is a OBD2 diagnostic trouble code indicating a fault within the exhaust valve control circuit. This code is similar to P0085 and P0084. What the P0086 code means P0086 is a DTC when...
P0063 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 2 Sensor 3)
P0063 P0063 trouble code definition Trouble code P0062 indicates that the heater element used to heat up an oxygen sensor has malfunctioned. To switch on an oxygen sensor either a power or a ground is supplied to the sensor. A...
P0813 OBD-II Trouble Code: Reverse Output Circuit Malfunction
P0813 P0813 code definition P0813 is the fault code for the Reverse Output Circuit. What the P0813 code means This is the generic OBD-II fault code indicating an issue within the reverse output circuit. When you shift your vehicle into...