2009 HUMMER H2

Typical onset: 80,000-150,000 mi

Symptoms: Check engine light with P0300-series misfire codes or P0521 oil pressure, Lifter tick or tapping noise on cold start that persists, Loss of power, rough idle, cylinder deactivation malfunction, Metal debris in oil during changes

Fix: AFM lifters collapse and damage cam lobes. Requires heads-off teardown, replace all lifters, camshaft, sometimes valve springs and pushrods. Delete AFM with aftermarket non-AFM cam or live with risk of repeat failure. 18-24 labor hours depending on how deep the damage goes.

Estimated cost: $3,500-6,500

Typical onset: 70,000-120,000 mi

Symptoms: Transmission slipping or delayed engagement, Milky or strawberry-milkshake appearance in coolant reservoir, Engine overheating combined with transmission issues, Low transmission fluid with no visible external leak

Fix: Internal cooler in radiator fails, allowing coolant into trans fluid or vice versa. Requires new radiator, complete transmission flush (sometimes full rebuild if damage occurred), cooler lines. If contamination sat, trans is toast. 8-12 hours labor for cooler and flush; add 15-20 hours if trans rebuild needed.

Estimated cost: $1,200-2,500 (cooler/flush) or $3,500-5,000 (if trans rebuild required)

Typical onset: 60,000-110,000 mi

Symptoms: No-start or stalling, especially when tank below half, Fuel gauge reading erratically or stuck on empty/full, Engine stumbling or cutting out during acceleration, Whining noise from fuel tank area

Fix: Pump module assembly fails; sender units are known weak points on GMT900. Requires dropping 32-gallon fuel tank, replacing entire pump module. Work is tedious due to tank size and skid plate removal. 4-5 hours labor.

Estimated cost: $800-1,400

Typical onset: 70,000-130,000 mi

Symptoms: Service 4WD message on dash, Unable to shift into or out of 4WD modes, Grinding or clunking when attempting mode changes, Blinking 4WD indicator lights

Fix: Encoder motor on NP246 transfer case wears out or position sensor fails. Sometimes just motor replacement, sometimes internal mode fork or chain issues require case teardown. Motor alone: 2-3 hours. Full internal work: 8-10 hours.

Estimated cost: $600-1,200 (motor) or $1,800-3,000 (internal repair)

Typical onset: 90,000-140,000 mi

Symptoms: ABS, traction control, and StabiliTrak lights all illuminated, Loss of ABS and stability control function, Codes C0265, C0267, or pump motor circuit codes, Sometimes causes firm brake pedal with reduced assist

Fix: EBCM or internal pump motor fails. Module is integrated with ABS pump; requires complete assembly replacement and bleeding. Some units available remanufactured. 3-4 hours labor including bleed and setup.

Estimated cost: $1,200-2,200

Typical onset: 80,000-150,000 mi

Symptoms: Loud exhaust ticking or tapping from engine bay, worse on cold start, Exhaust smell in cabin or under hood, Visible soot streaks on manifolds, Check engine light with O2 sensor codes

Fix: Cast iron manifolds crack or mounting bolts break due to heat cycling. Bolts often break flush in head, requiring extraction. Both sides common. Remove manifolds, extract broken bolts, resurface head flange if warped, new gaskets and Grade 8 bolts. 6-8 hours per side.

Estimated cost: $800-1,600 per side

Typical onset: 70,000-120,000 mi

Symptoms: A/C blows warm intermittently or constantly, Compressor clutch not engaging or cycling rapidly, Front condenser leaking refrigerant (check for rock damage), Squealing from compressor area

Fix: Clutch coil or bearing fails, or front condenser gets punctured from road debris. Compressor replacement: 3-4 hours. Condenser: 4-5 hours due to grille and bumper removal. System requires evacuation, component swap, and recharge.

Estimated cost: $900-1,600