The 2001 F-350 with the 7.3L Power Stroke is legendary for durability, but transmission cooler failures destroy E4OD/4R100 automatics, injector issues plague high-mileage units, and under-valve-cover harness failures cause misfires and no-starts. Most problems are age-related rather than design flaws.
Transmission Oil Cooler Failure Leading to Catastrophic Transmission Damage
Common · high severityTypical onset: 120,000-200,000 mi
Symptoms: Milkshake-like transmission fluid (coolant contamination), Transmission slipping or delayed shifts, Overheating transmission, Sudden complete transmission failure
Fix: Factory cooler inside radiator fails, mixing coolant into ATF and destroying clutch packs. Requires transmission teardown/rebuild (12-16 hours) plus external cooler install (2 hours) and radiator replacement or bypass (1.5 hours). Preventive: install external cooler and bypass factory unit before failure.
Estimated cost: $3,500-5,500
Fuel Injector Failure and Stiction
Common · medium severityTypical onset: 180,000-250,000 mi
Symptoms: Hard cold starts or extended cranking, Rough idle and white smoke on startup, Loss of power under load, Cylinder contribution balance codes (P1280-P1288)
Fix: HEUI injectors stick or fail due to contamination and wear. Replacement is 8-10 hours for full set removal, test, and installation. Many shops replace all eight at once to avoid comebacks. Use quality fuel filters every 10k miles and additive to extend life.
Estimated cost: $2,800-4,200
Under-Valve-Cover Harness (UVCH) Connector Failure
Common · high severityTypical onset: 150,000-220,000 mi
Symptoms: Intermittent or permanent no-start, Multiple cylinder misfire codes, Injector circuit codes, Engine runs on some cylinders only
Fix: Connectors under valve covers corrode from oil contamination, losing continuity to injectors and glow plugs. Requires valve cover removal both sides (3-4 hours), harness replacement or repair, and often glow plug replacement. Check during any valve cover gasket job.
Estimated cost: $800-1,400
Turbo Pedestal O-Ring Oil Leak
Occasional · medium severityTypical onset: 140,000-200,000 mi
Symptoms: Oil leak from back of engine near turbo, Low oil level without visible drips on ground, Smoke from engine bay under load, Oil coating turbo and downpipe
Fix: O-rings on oil supply pedestal under turbo fail from heat cycles. Requires turbo removal (5-7 hours) to access and replace o-rings. Often done with turbo rebuild. Small leak can be monitored; heavy leak risks oil starvation to turbo bearings.
Estimated cost: $900-1,600
Exhaust Back Pressure (EBP) Sensor and Tube Failure
Occasional · low severityTypical onset: 100,000-180,000 mi
Symptoms: Check engine light with EBP codes (P0470-P0473), Poor boost control or overboost, Black smoke under acceleration, Limp mode or reduced power
Fix: Sensor or stainless tube from exhaust manifold corrodes or plugs with soot. Replacement is straightforward (0.5-1 hour) but tube can break off in manifold requiring extraction. Sensor alone is quick; seized tube adds time and risk.
Estimated cost: $150-400
Glow Plug Relay (GPR) 'Click of Death'
Occasional · medium severitySymptoms: Rapid clicking from relay under hood, Hard starting in cold weather, Extended cranking before start, Glow plug indicator stays on
Fix: Relay contacts weld or fail, causing continuous cycling and rapid clicking. Relay replacement is 15 minutes under hood on driver side fender. Cheap part ($30-80), but failure can damage glow plugs or wiring if left unchecked. Test glow plug draw before replacing relay.
Estimated cost: $100-250
Front Hub Unit Bearing Failure
Common · medium severityTypical onset: 100,000-160,000 mi
Symptoms: Grinding or humming from front wheels, Play in wheel when jacked up, ABS/4WD light intermittently, Vibration increases with speed
Fix: Vacuum-actuated front hubs and bearings wear from abuse and water intrusion. Unit bearing replacement is 2-3 hours per side with proper tools. F-350 dually rears rarely fail. Check for play during tire rotations.
Estimated cost: $400-700
Absolutely buy one used if maintained—the 7.3L is bulletproof when you stay ahead of injectors, coolers, and harness corrosion, easily reaching 400k+ miles with care.
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.