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Jared D
Jared D, ASE Certified Technician
Category: GM
Satisfied Customers: 1652
Experience:  Shop Supervisor at County Fleet
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Service stabilitrak light and check engine light come

Customer Question

Service stabilitrak light and check engine light come on---occasionally car runs rough, then straightens out and all warnings cease. Dealer installed a new valve cover and some kind of vent under the valve cover, put in new plugs, but issue not resolved. 2007 Yukon
JA: Does the light stay on, or does it blink?
Customer: At first it would do both---now it stays on
JA: Are you fixing your Yukon yourself? What have you tried so far?
Customer: No---loacal GM Dealer
JA: Anything else you want the mechanic to know before I connect you?
Customer: 2007 Yukon when it comes out of it it runs fine
Submitted: 3 months ago.
Category: GM
Expert:  Jared D replied 3 months ago.

Hi,

These trucks are notorious for faulty lifter cassettes. The lifters (they open the valves with the help of push rods and the camshaft) get gummed up and then get stuck causing a misfire and engine chatter.

Do you know what trouble codes are stored in the system?

Customer: replied 3 months ago.
No...but as I said earlier---they changed a vent undr the valve cover, replaced the valve cover and put in new plugs---was good for 2 days then started again.
Expert:  Jared D replied 3 months ago.

That's usually the first thing they change when the lifters start acting up. I think the best bet is to get it scanned for trouble codes (most parts stores will do it for free) and see what system is triggering the fault. It's likely we will see a misfire code on one of the rear cylinders- they are the most common to act up.

Expert:  Jared D replied 3 months ago.

Please let me know if you need additional info.