Check engine light on p0356

[TexEx]

Made a repair on a coil pack including spark plug, truck is running back to normal but light has not gone off as of yet & it has been driven about 120miles...anyone with experience having to drive more miles than that for the light to go off?

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[Jeff G]

I believe you have to clear the code first with an OBD reader. I had to with mine.

 

[RichardH]

Yes. Not to contradict Jeff, but if the 'systems' see it is performing correctly, I have read/heard the CEL/MIL should clear itself...

 

[CountrySplatt]

Yeah, mine required a Hard Clear from a mechanic to stay gone. Most of the OBD readers at Auto Parts stores only do a soft clear, from what I was told. Took mine to a mechanic friend at a shop, and he told me that and cleared the code for me for free and it has been gone for about 2000 miles.

 

[texasscot]

Yeah, mine required a Hard Clear from a mechanic to stay gone. Most of the OBD readers at Auto Parts stores only do a soft clear, from what I was told. Took mine to a mechanic friend at a shop, and he told me that and cleared the code for me for free and it has been gone for about 2000 miles.

IMO even a cheap code reader ($20?) is an essential tool for working on these vehicles. I've done loads of repairs based on faults read and cleared by a basic model, mainly misfires and vacuum leaks. I've never heard of hard/soft clears but i've never had a problem clearing any of them with el cheapo unit.

 

[Old Guy]

I did some research on this. It requires 40 "drive cycles" to auto clear. A drive cycle is: start the car, drive it for a while, stop car, turn off car.

In some cases, if you disconnect a battery lead for 10 minutes and reconnect it, the computer will reboot when re started. If it does not clear the code, it will not screw up the car.

Buy a code reader. I have seen them on sale for $40 at Harbor freight. Mine is 15 years old and still works.

Note: if you clear the code and it comes back, the problem may still be there. When mine ate a coil. I changed all the coils and plugs. I used NAPA gold coils at $35 each and 50K miles later it still purrs smoother than my cat.

 

[Adieu]

Yeah, mine required a Hard Clear from a mechanic to stay gone. Most of the OBD readers at Auto Parts stores only do a soft clear, from what I was told. Took mine to a mechanic friend at a shop, and he told me that and cleared the code for me for free and it has been gone for about 2000 miles.

Get a $12 panlong elm327 from amazon. Reads and clears codes and shows a gazillion graphable stats with your phone, tablet, or aftermarket android headunit.

Lasts for years.

And don't listen to parts store bs.

 

[rjdelp7]

P0356 is an open circuit malfunction. That means bad connection or bad wiring harness. On my Expedition, I had a different code for the coil. I think it was P0303. When I installed the new one and started the engine, the flashing CEL was out.

 

[Wegner44]

I've always disconnected the battery and let it sit for a while before reconnecting.

 

[rjdelp7]

I've always disconnected the battery and let it sit for a while before reconnecting.

If the 'misfire' is gone the flashing 'service engine' light will not flash. There is no code to clear.

 

[TexEx]

Thanks, I've seen some really helpful obd2 bluetooth scanners look that invaluable..the veepeak seems to be very reasonable & quite useful...btw disconnected neg batt cable & the engine light has stayed off for the 200 miles...running smooth.

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[TexEx]

Sorry not familiar with CEL? What exactly?
Thx

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[TexEx]

P0356 is an open circuit malfunction. That means bad connection or bad wiring harness. On my Expedition, I had a different code for the coil. I think it was P0303. When I installed the new one and started the engine, the flashing CEL was out.

What does CEL stand for? Sorry not familiar , thx

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[rjdelp7]

What does CEL stand for? Sorry not familiar , thx

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'check engine light' or mechanics refer to, the $ money light.

 

[TexEx]

'check engine light'

Sorry , duh moment...in fact I should change the harness, the in place clip that holds down the connection broke off due to heat brittleness..I think i have 3 that are like that now..thx.

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[texasscot]

The connectors for the coils and the injectors are readily available aftermarket. Fiddly to change of course but doable.

 

[Kryo-Genik]

I use my SCT programmer for my lightning to clear my codes. Get one, get a decent tune and you'll be fine. You can data log the truck on a laptop as well as check for codes and clear codes