Skip the auto shop - Our mechanics make house calls

Q: Engine light keeps turning on, 2006 Dodge Caravan

asked by on

Purchased vehicle 9-30-2016. On my way home the engine light came on. Took to o riellys and they're obd scanner came up with the code p0456. So we replaced gas cap disconnected battery. Four days later light back on. Had scanner 're read and got p0456 again,and code p0302. Took to dealership Friday 10-21. Told problems had been fixed. Light came on today 10-22. Got computer scanned again and both codes reappeared!! I need to know please if this is because the dealer didn't erase codes,or,if problems weren't actually fixed?? Asked for print out of what was done before I left dealership and I was told there isn't one because I'm not paying for service???Asked for one anyway for my records and was told to come back Monday to get one?? Please give me your advice. Thanks so much for your time. Kimmie

My car has 10000 miles.
My car has an automatic transmission.

It sounds to me like the dealership simply tightened the gas cap and didn’t charge you for it nor recorded the transaction. Not to worry though. I don’t believe tightening the gas cap would be the proper repair. What you have are 2 codes: a P0456 for an evaporative emissions leak and a P0302 for a cylinder 2 misfire. Could these be related? Not likely. The evaporative emissions code needs to have the system properly tested for the small leak as indicated by the code. A leak in the system could be anywhere from the gas cap to the tank to the engine. The misfire code could be caused by a few things; spark plug, ignition coil, wire harness, injector, ECU, intake leak at cylinder 2, etc. A quick test that you can do is swap the ignition coil with another and see if the code changes cylinders. If it does, the coil is faulty; however, as stated earlier, there are a variety of things that could be the cause. Without seeing data on a professional scan toll, the source can be difficult to pinpoint. The scan tool does not diagnose. It leads the technician to the system that has the fault; the computer does not know what the fault is, only that it is not operating properly. YourMechanic has several technicians available that can assist you with a check engine light inspection and provide an estimate and direction of repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Get a quote

What others are asking

Q: Emissions Systems code P0456.

This fault code indicates a very small leak in the evaporative emission system. This is usually a failure in the integrity of the evaporative emission system and not something simple such as the fuel cap was left off (that would...

Q: The key won't turn in the ignition

There are several things that may be causing these issues. One place to start is the shift lever. There is a sensor that only allows the vehicle to be started if it is in park or neutral. Try shifting the...

Q: Engine roar while braking/ stuttering while accelerating

Hi there. If the engine noise is happening only when the car is in forward gear, the issue might be caused by a damaged CV joint or the wheel bearings. However, if you're experiencing this sound while braking, it could...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.