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Check engine light

poweraidon

poweraidon

Well-Known Member
Messages
830
Location
georgia
Codes are p0302 and p0455

The p0455 started to come on after my h3 was stuck over night with water freezing under it. I thought it was just a gas cape but it was still there after I got a new one (new one isn't oem)

The p0302 just popped up not too long ago

What could be causing it?


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E

evldave

Well-Known Member
Messages
93
Location
somewhere west of north
p0302 is misfire on Cylinder 2. Easiest check is to make sure the coil is fully connected (#2 is second back from the front of the truck). If it looks like it's tight and you still are getting the code, switch the coil with Cylinder 3 and see if the code changes to p0303. That will tell you it's a coil.
 
poweraidon

poweraidon

Well-Known Member
Messages
830
Location
georgia
evldave said:
p0302 is misfire on Cylinder 2. Easiest check is to make sure the coil is fully connected (#2 is second back from the front of the truck). If it looks like it's tight and you still are getting the code, switch the coil with Cylinder 3 and see if the code changes to p0303. That will tell you it's a coil.
Click to expand...

Could it be the spark plug?


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evldave

Well-Known Member
Messages
93
Location
somewhere west of north
If not the coil or spark plug, it's probably an injector. I believe (someone will chime in) that once you remove the injector, you need to use a new o-ring for replacement. So don't pull that until/unless you are sure it's not one of the other items...
 
poweraidon

poweraidon

Well-Known Member
Messages
830
Location
georgia
I'm just gonna order some new coils ( super sparkz)

What could be causing p0455?



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Best4x4

Well-Known Member
Messages
1,042
Location
Vidor, TX
The super sparks just replace the OEM coil spring which goes from the coil to spark plug itself. It provides a better spark. However coils/coil packs do have a service life and will need replacing. Normally should get to 100k on the OEM plugs and coils without messing with them, but with anything electrical they do fail from time to time. As suggested earlier, simply swap the entire coil with another cylinder and see if it follows the coil pack. If it doesn't and the problem stays on the #2 cylinder then check the plug, injector, and compression on that cylinder. If it's a 3.5 you could have the head issue.
 
poweraidon

poweraidon

Well-Known Member
Messages
830
Location
georgia
Best4x4 said:
The super sparks just replace the OEM coil spring which goes from the coil to spark plug itself. It provides a better spark. However coils/coil packs do have a service life and will need replacing. Normally should get to 100k on the OEM plugs and coils without messing with them, but with anything electrical they do fail from time to time. As suggested earlier, simply swap the entire coil with another cylinder and see if it follows the coil pack. If it doesn't and the problem stays on the #2 cylinder then check the plug, injector, and compression on that cylinder. If it's a 3.5 you could have the head issue.
Click to expand...

I really hope it's not the head... I'm gonna see if the super sparkz fixes the problem. I don't think it could be the spark plugs cause I just changed them a month ago


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Best4x4

Well-Known Member
Messages
1,042
Location
Vidor, TX
Doubt the super sparks are gonna help. Move a coil first, if it follows the coil then just buy a complete new coil (not just the spring) and you're done. The super sparks are a performance item meant to enhance the spark, but if the coil isn't giving a strong enough spark the super sparks are worthless. Save the $$ and troubleshoot first and repair it vs just start dumping parts into it.
 
poweraidon

poweraidon

Well-Known Member
Messages
830
Location
georgia
Best4x4 said:
Doubt the super sparks are gonna help. Move a coil first, if it follows the coil then just buy a complete new coil (not just the spring) and you're done. The super sparks are a performance item meant to enhance the spark, but if the coil isn't giving a strong enough spark the super sparks are worthless. Save the $$ and troubleshoot first and repair it vs just start dumping parts into it.
Click to expand...

I'm gonna get a new coil I remember last time I changed my spark plugs I noticed some corrosion on the coil


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