2018 JEEP GRAND CHEROKEE TRACKHAWK

Typical onset: 30,000-60,000 mi

Symptoms: Transmission temperature warning on dash during spirited driving or towing, Harsh shifting or limp mode after sustained high-load use, Transmission fluid discoloration or burnt smell during service, Oil cooler lines seeping at crimped connections

Fix: External oil cooler lines crack or the cooler itself clogs with clutch material. Requires dropping the transmission pan, sometimes full cooler replacement with upgraded lines. 4-6 hours labor depending on whether you're just doing lines or the full cooler assembly. Strongly recommend fluid flush with Mopar-spec ATF+4 after repair.

Estimated cost: $1,200-2,800

Typical onset: 40,000-70,000 mi

Symptoms: Intermittent supercharger whine that changes pitch or volume, Loss of boost pressure under hard acceleration (feels slower than normal), Squealing from engine bay during cold starts, Belt dust or rubber particles around supercharger area

Fix: The 2.7L IHI supercharger uses a dedicated 10-rib belt that can slip when worn or if the idler pulley bearing fails. Belt replacement is 2-3 hours but if the pulley bearing is gone, you're looking at 5-7 hours for proper supercharger removal and pulley replacement. Do NOT ignore this—belt failure at high RPM can grenade the supercharger.

Estimated cost: $800-3,500

Typical onset: 60,000-90,000 mi

Symptoms: Deep knocking sound from lower engine, especially when cold or under load, Metal shavings in oil during changes, Sudden oil pressure drop, Catastrophic failure: thrown rod through block

Fix: The supercharged 6.2L Hemi runs high cylinder pressures and some units (especially those with extended oil change intervals or track use) develop rod bearing wear. Requires full engine-out teardown, crank polishing or replacement, new bearings, and reassembly. 25-35 hours labor. Many owners opt for short block replacement instead of rebuild. This is a $15K+ job at indie shops, more at dealers.

Estimated cost: $15,000-25,000

Typical onset: 50,000-80,000 mi

Symptoms: Clunking when shifting from park to drive or reverse, Excessive driveline shudder during hard launches, Visible sagging of transmission tailshaft when inspected on lift, Increased cabin vibration at idle in gear

Fix: The 707 hp and 645 lb-ft overwhelm the factory rubber transmission mount, especially if you're doing launches. Mount replacement is straightforward but requires supporting the transmission. 2-3 hours labor. Aftermarket polyurethane mounts last longer but increase NVH.

Estimated cost: $400-800

Symptoms: Hard starting or extended cranking, especially when hot, Rough idle or hesitation under light throttle, Check engine light with fuel pressure sensor codes (P0087, P0191), Loss of power at high RPM

Fix: The high-pressure fuel system is sensitive to contamination. Some owners see premature fuel filter clogging or high-pressure pump wear if they've run questionable fuel. Filter replacement is 1 hour, but if the pump has failed you're looking at 4-5 hours for pump R&R plus fuel system cleaning. Always run top-tier 91+ octane.

Estimated cost: $300-2,200

Typical onset: 40,000-100,000 mi

Symptoms: Check engine light with exhaust valve control codes, Stuck-open exhaust (always loud) or stuck-closed (always quiet), Rattling from exhaust tips during mode changes, No response when toggling exhaust modes on dash

Fix: The electric motors that control the exhaust valves can fail, especially in salt-belt states. Replacement involves cutting exhaust clamps and swapping valve assemblies. 2-3 hours per side. Not a safety issue but annoying if you like switching between stealth and aggressive modes.

Estimated cost: $800-1,400