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Gary, GM Technician
Category: GMC
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Experience:  Senior Technician
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GMC Yukon 4x4 SLT: I have 2007 Yukon staying in V8 mode

Customer Question

I have 2007 Yukon staying in V8 mode
Submitted: 2 years ago.
Category: GMC
Expert:  Gary replied 2 years ago.
Hi there,
The DOD function (or AFM in Australia) is controlled by a VLOM, (valve lifter oil manifold assembly).
PCM Solenoid operated oil assembly under the inlet inlet manifold.
Has this happened since you had the inlet manifold off?
Possibly pinched a wire in VLOM harness?