99 GMC Yukon codes P0305 and P1345

QARMSTEAD

MEMBER
1999 GMC YUKON
5.7L
V8
2WD
AUTOMATIC
219,991 MILES

I'm getting these codes p0305 and p1345 twice on the actron meter reading can someone please tell me what is the problem and how can I fix
Thanks.
in advance
Amanda
And I removed the sparkplug and had a Little oil is this bad?

2 Replies

JOHNNYT73

MECHANIC
924 POSTS

P0305 = misfire cylinder #5
P1345 = crank position/cam position correlation.

First find out what is causing your misfire. Check that you speak at the wire where it goes to the plug. If you do then try a new plug.

The P1345 can be set of the distributor hold down bolt is loose, or if the crank sensor is bad. I think timing has to be set with a scan tool on these trucks. Try correcting the misfire to see if both codes go away.