2015 GMC YUKON

Typical onset: 80,000-150,000 mi

Symptoms: Cold-start tick or lifter knock that may disappear when warm, Check engine light with P0300-series misfire codes or P0521 oil pressure code, Metal shavings in oil or oil filter, Eventually: catastrophic loss of power, engine seizure

Fix: Collapsed AFM lifter destroys cam lobe, sends metal through engine. Requires engine disassembly at minimum (16-24 hours labor): new lifters, camshaft, oil pump, timing chain. Frequently needs shortblock or complete engine replacement if metal debris circulated. AFM delete kit recommended during repair.

Estimated cost: $4,500-9,500

Typical onset: 60,000-120,000 mi

Symptoms: Pink or red fluid puddle under vehicle (driver side near radiator), Transmission slipping or shuddering, Transmission overheating warnings, Milky transmission fluid or coolant contamination in trans pan

Fix: Factory quick-connect cooler lines fail at crimp points or corrode through. If coolant mixes with ATF, transmission internals are compromised. Catch early: replace lines only (3-4 hours). If coolant entered trans: flush won't save it—needs rebuild or replacement (12-18 hours).

Estimated cost: $400-800 (lines only), $3,500-5,500 (transmission replacement)

Typical onset: 70,000-130,000 mi

Symptoms: Sudden loss of power steering assist (feels like manual steering), Service power steering message on dash, Steering very heavy at low speeds, normalizes above 40 mph in some cases, No warning before failure in many instances

Fix: Electric assist motor or control module on steering column fails. Not repairable—requires replacement of entire EPS column assembly. 4-6 hours labor. Two NHTSA recalls related to software/sensor issues but hardware failure still common outside recall scope.

Estimated cost: $1,800-2,800

Typical onset: 80,000-140,000 mi

Symptoms: Service 4WD message on dash, Won't engage 4WD or stuck in 4WD, Grinding or whining noise from transfer case area, Fluid leak from transfer case front seal or encoder motor

Fix: NVG/NP8 transfer case has weak encoder motor and front pump seal. Encoder motor alone: 2-3 hours. If internal damage occurred from running low on fluid: complete rebuild or replacement (6-10 hours). Recall 15V530 addressed some units but not all.

Estimated cost: $600-1,200 (encoder motor), $2,200-3,800 (rebuild/replace)

Typical onset: 90,000-150,000 mi

Symptoms: Hard brake pedal requiring excessive force, Check engine light with P0496, P2440 codes, Hissing sound from engine compartment (driver side rear), Brake pedal effort increases gradually over weeks

Fix: Engine-driven vacuum pump (mounted on rear of driver-side cylinder head) develops internal wear or diaphragm failure. Replace pump and check valve: 2-3 hours. Recall 19V666 addressed some units but covered limited VINs.

Estimated cost: $500-900

Typical onset: 50,000-100,000 mi

Symptoms: ABS light, traction control light, or StabiliTrak disabled message, False activation of ABS during normal braking, Codes C0035-C0050 (wheel speed sensor circuit), More common in rust-belt states

Fix: Front wheel bearing hubs have integrated tone rings that corrode or sensors fail. Sensor replacement: 0.5-1 hour per corner if caught early. If tone ring damaged: entire hub assembly replacement (1.5-2 hours per side).

Estimated cost: $150-300 (sensor), $400-700 (hub assembly)