The 2019 Chrysler 300 is a mature LX/LD platform with solid bones but shows transmission cooling vulnerabilities and drivetrain bearing wear that can escalate into catastrophic failures if ignored. The Pentastar V6 is generally reliable; the 5.7 Hemi has lifter/cam issues that plague the entire generation.
Transmission Oil Cooler Failure Leading to Strawberry Milkshake
Common · high severityTypical onset: 60,000-100,000 mi
Symptoms: Transmission fluid contaminated with coolant (pink/milky appearance), Harsh shifting or slipping after cooler ruptures internally, Overheating transmission, limp mode activation, Engine coolant loss without external leaks
Fix: Replace transmission oil cooler, flush both cooling system and transmission completely (multiple flushes required to clear contamination), replace transmission filter. If caught late, internal transmission damage requires rebuild or replacement. Total 6-10 hours labor depending on contamination extent.
Estimated cost: $800-1,200 if caught early; $3,500-5,500 with transmission rebuild
5.7L Hemi MDS Lifter and Camshaft Failure
Common · high severityTypical onset: 70,000-130,000 mi
Symptoms: Ticking or tapping noise from valve train, especially on cold starts, MIL with misfire codes (often P0300 range), Rough idle, loss of power, Metal shavings in oil during changes
Fix: Replace failed lifters (commonly cylinders 1, 4, 6, or 7), camshaft if lobes are worn, and all rocker arms as preventive measure. Requires cylinder head removal on affected bank. 12-16 hours labor for single bank, 20-24 hours if both banks affected.
Estimated cost: $3,000-4,500 single bank; $5,000-7,500 both banks
Transmission Output Shaft Bearing Failure
Occasional · high severityTypical onset: 80,000-140,000 mi
Symptoms: Grinding or whining noise from transmission area, speed-dependent, Vibration through drivetrain during acceleration, Noise changes with load but not with gear selection, Metal debris on transmission pan magnetic drain plug
Fix: Transmission must be removed, disassembled, output shaft bearing and seal replaced, check for shaft scoring. Often find secondary damage to bushings or gears if driven too long. 10-14 hours labor for removal, repair, and reinstall with fluid service.
Estimated cost: $2,200-3,800
Transmission Mount Failure
Common · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle in Drive, Visible transmission sag or misalignment when inspected on lift, Harsh engagement into gear
Fix: Replace transmission mount (crossmember mount typically fails first). Support transmission with jack, remove mount bolts, swap mount. 1.5-2.5 hours labor. Often done with engine mounts at same time if those show wear.
Estimated cost: $250-450
Fuel Filter Clogging on High-Mileage Units
Occasional · medium severityTypical onset: 100,000-150,000 mi
Symptoms: Hesitation or stumble during acceleration, especially under load, Hard starting after sitting, long crank times, Loss of power on highway merges, Fuel pump running louder than normal
Fix: Replace in-tank fuel pump module assembly (filter is integral, non-serviceable separately on this platform). Drop fuel tank, disconnect lines and electrical, swap module. 2.5-3.5 hours labor.
Estimated cost: $600-950
3.6L Pentastar Water Pump and Thermostat Housing Leaks
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Coolant weeping from timing cover area or thermostat housing, Sweet smell from engine bay, coolant level drops gradually, Engine overheating if leak progresses unchecked, Visible coolant residue on front of engine
Fix: Water pump is timing-chain driven internally; requires timing cover removal, chain tensioner reset, new pump and gaskets. Thermostat housing cracks at plastic interfaces. 5-7 hours labor for water pump; 1.5 hours for thermostat housing alone.
Estimated cost: $800-1,400 water pump; $250-400 thermostat housing
The 2019 Chrysler 300 is a decent used buy IF you can verify transmission cooler and fluid condition on test drive and avoid 5.7L Hemi models with lifter tick—budget $2,000-3,000 for deferred drivetrain maintenance on any high-mileage example.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.