The 1998 Plymouth Grand Voyager with the 3.3L or 3.8L V6 is a practical family hauler undermined by catastrophic transmission failures and head gasket issues that often total the vehicle economically. These vans require religious fluid maintenance and still frequently fail before 150,000 miles.
41TE Automatic Transmission Failure
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Delayed engagement into reverse or drive, Harsh 2-3 shift or slipping between gears, Shuddering on acceleration from a stop, Complete loss of forward gears, stuck in limp mode
Fix: The 41TE is notorious for governor pressure solenoid and overdrive clutch pack failures. Rebuild requires 12-16 hours labor, but used transmissions often fail quickly. Replace transmission oil cooler simultaneously or repeat failure is guaranteed within 20,000 miles.
Estimated cost: $2,200-3,800
Head Gasket Failure (Both Banks)
Common · high severityTypical onset: 90,000-150,000 mi
Symptoms: External coolant leaks at cylinder head mating surface, White smoke from exhaust, sweet smell, Overheating with no visible leaks, Oil contamination in coolant reservoir (milky appearance), Misfires and rough idle when warmed up
Fix: The 3.3L and 3.8L both suffer head gasket failures due to dissimilar metal expansion rates. Job requires 14-18 hours, must deck heads if warped (common), and typically reveals worn valve guides. Many owners discover cracked heads during teardown, turning this into a short block job.
Estimated cost: $2,800-4,500
Intake Manifold Gasket Leaks
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Coolant drips underneath engine between firewall and block, Rough idle and hesitation when cold, Slow coolant loss with no external puddles visible, Check engine light with lean codes (P0171/P0174)
Fix: The lower intake plenum gasket deteriorates and allows coolant into the crankcase or vacuum leaks. Requires 6-8 hours to remove upper plenum, injector rails, and lower manifold. Use updated Mopar gaskets, not aftermarket, or expect repeat failure in 30,000 miles.
Estimated cost: $800-1,400
Automatic Transmission Cooler Line Corrosion
Common · high severityTypical onset: 60,000-110,000 mi
Symptoms: Transmission fluid puddles under front of vehicle, Transmission slipping or delayed shifts after leak develops, Visible rust and fluid seepage at steel line connections near radiator, Low fluid level on dipstick
Fix: Steel cooler lines rust through where they mount to the radiator and at crimped fittings. Even small leaks cause transmission damage within days if driven. Replace all lines and external cooler simultaneously (3-5 hours). Aftermarket stainless lines are worthwhile upgrade.
Estimated cost: $450-850
Crankshaft Position Sensor Failure (No-Start Condition)
Occasional · high severitySymptoms: No-start with cranking but no firing, often when hot, Stalling at operating temperature that restarts when cool, Check engine light with P0320 or P1391 codes, Intermittent dying while driving in hot weather
Fix: Sensor behind engine near bellhousing fails from heat cycling. Requires 1.5-2.5 hours due to access from underneath and above simultaneously. Use OEM Mopar sensor only—aftermarket sensors fail repeatedly. Test with oscilloscope before condemning.
Estimated cost: $250-450
Engine Sludge Formation (Inadequate Maintenance)
Occasional · high severityTypical onset: 100,000-180,000 mi
Symptoms: Valve train noise, ticking or tapping at idle, Low oil pressure warning at hot idle, Oil consumption exceeding 1 quart per 1,000 miles, Check engine light with variable valve timing codes
Fix: These engines sludge catastrophically if oil changes exceed 4,000-mile intervals. Sludge blocks oil galleys to rockers and main bearings. Requires complete engine teardown and cleaning (20+ hours) or short block replacement. Prevention is the only realistic cure—once sludged, bearing damage is already done.
Estimated cost: $3,500-6,000
Power Sliding Door Module Failures
Occasional · low severityTypical onset: 80,000-140,000 mi
Symptoms: Door closes then immediately reopens, Door operates from only one switch (not all three), Door stops mid-travel with error chime, Complete failure to respond to any switch input
Fix: Control module under driver's seat corrodes from water intrusion through door seals. Requires 2-3 hours to diagnose and replace module, plus reprogramming. Clean all door track rollers and lubricate cables or new module fails from mechanical binding. Verify door alignment before throwing parts.
Estimated cost: $400-750
Only buy if under $2,000 with proof of recent transmission rebuild and verified clean oil system—these are throwaway vans once major components fail, as repair costs exceed vehicle value.
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.