The 2003 F-350 with the 7.3L Power Stroke is one of the most durable diesel platforms Ford ever built, but it's now 20+ years old and high-mileage examples show wear in injectors, fuel systems, and transmissions. Engine internals rarely fail unless severely neglected or abused.
Injector Failure and Stiction
Common · medium severity
Typical onset: 180,000-250,000 mi
Symptoms: Hard starting, especially cold, Rough idle with white smoke, Loss of power under load, Increased fuel consumption
Fix: 7.3L injectors stick or fail electrically. Requires removing valve covers, injector replacement (often all 8 for consistency), new under-valve-cover harnesses, and injector sleeves if leaking. 10-14 hours labor depending on cab configuration.
Estimated cost: $2,800-4,500
High-Pressure Oil Pump (HPOP) and Reservoir Leaks
Occasional · high severity
Typical onset: 200,000-300,000 mi
Symptoms: Extended cranking before start, Loss of power, won't rev past 2000 RPM, Oil in valley under intake, ICP sensor reading low
Fix: HEUI injection system uses high-pressure oil to fire injectors. Pump, reservoir O-rings, and lines fail. Requires intake manifold removal, HPOP replacement or rebuild, new O-rings throughout. 8-12 hours labor.
Estimated cost: $1,800-3,200
Transmission (4R100/5R110) Oil Cooler Failure
Common · high severity
Typical onset: 120,000-180,000 mi
Symptoms: Transmission fluid in coolant (strawberry milkshake), Coolant in transmission, Transmission slipping or delayed engagement, Overheating
Fix: Internal radiator trans cooler ruptures, mixing fluids. Requires radiator replacement, transmission flush (sometimes full rebuild if coolant damage occurred), new cooler lines. If caught early: 4-6 hours. If trans damaged: add 12-18 hours for rebuild.
Estimated cost: $800-1,200 (cooler only), $3,500-5,500 (if trans rebuild needed)
Turbo Exhaust Pedestal Leak
Occasional · medium severity
Typical onset: 150,000-250,000 mi
Symptoms: Exhaust leak sound at turbo, Loss of boost pressure, Black soot around turbo base, Check engine light with low boost codes
Fix: Exhaust manifold-to-turbo pedestal develops cracks or warps. Requires turbo removal, pedestal replacement or machining, new gaskets and bolts. 6-8 hours labor.
Estimated cost: $1,200-2,000
Glow Plug Relay and Module Failure
Common · low severity
Symptoms: Hard starting in cold weather, Extended glow plug wait time, No glow plug indicator on dash, Relay clicking continuously
Fix: Relay under hood or glow plug control module fails. Simple replacement, 0.5-1 hour. However, broken glow plugs can snap off in cylinder head (common on neglected trucks), requiring head removal. Always check glow plug resistance before replacement.
Symptoms: Sudden stalling while driving, No-start, cranks but won't fire, Intermittent dying at idle, No check engine light (fails instantly)
Fix: Sensor located behind front cover fails suddenly, stranding vehicle. Replacement requires draining coolant, removing front cover, sensor swap, reassembly. 3-4 hours labor. Smart owners carry a spare.
Estimated cost: $400-700
Ball Joints and Unit Bearings
Common · medium severity
Typical onset: 100,000-150,000 mi
Symptoms: Clunking over bumps, Steering wander or play, Grinding noise from wheels, Uneven tire wear
Fix: Dana 60 front end ball joints wear, especially on trucks used for towing or off-road. Unit bearings also fail. Ball joint replacement: 4-6 hours both sides. Hub bearings: 2-3 hours each.
Estimated cost: $800-1,400 (ball joints), $400-700 per hub
Owner tips
Change fuel filters religiously every 10k miles—water and debris kill injectors
Install an aftermarket transmission cooler and bypass the internal radiator cooler to prevent mixing
Keep a spare CPS sensor in the glovebox—they fail without warning
Use quality 15W-40 diesel oil (Rotella, Delo) and change every 5k miles
Flush coolant every 3 years with proper diesel additive to protect HPOP and injector O-rings
Inspect and replace UVCH (under-valve-cover harnesses) if any injector work is done
Buy one if under 200k miles with maintenance records—among the most reliable diesel trucks ever made, but budget $3-5k for deferred maintenance on high-mileage examples.
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.
Fitment notes: 7.3L Power Stroke diesel requires high CCA battery due to compression ignition demands; dual battery system available on some configurations
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Control Modules — 2003 Ford F-350
Every control module on the 1999-2004 Ford F-350 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 Distributed system: transceiver in Instrument Cluster, authentication in PCM
🔧 Ford NGS or Ford IDS
⚠️ Not a separate module. Key programming requires dealer tool access to PCM and IC. Two programmed keys required to self-program additional keys.
Lighting Control Module (LCM)dealer / factory toolwith automatic headlamps or advanced lighting features▸ programming details
📍 Integrated within GEM/SJB
🔧 Ford NGS or Ford IDS
⚠️ Not a separate module; function integrated in GEM/SJB. Configuration handled during GEM programming.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
FORD IS RECALLING CERTAIN MODEL YEAR 2011 RANGER TRUCKS BUILT FROM JANUARY 25, 2011, THROUGH APRIL 25, 2011 AT THE TWIN CITIES ASSEMBLY PLANT, AND SERVICE PARTS DISTRIBUTED TO DEALERS FOR CERTAIN 2004 THROUGH 2011 MODEL YEAR RANGER TRUCKS, 2002 THROUGH 2005 MODEL YEAR EXCURSION VEHICLES, AND 2002 THROUGH 2007 MODEL YEAR F-250, F-350, F-450, AND F-550 TRUCKS FOR FAILING TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THE MULTI-FUNCTION SWITCH WAS SHIPPED WITH A SUBCOMPONENT (SLIDER) THAT MAY EXPERIENCE DEFORMATION. A MULTI-FUNCTION SWITCH WITH A DEFORMED SLIDER MAY MALFUNCTION CAUSING THE TURN SIGNAL, TAIL LIGHTS, HAZARD WARNING SIGNAL FLASHERS AND/OR BRAKE LIGHTS NOT TO ACTIVATE.
Consequence: NON-FUNCTIONING LIGHTS COULD INCREASE THE RISK OF A CRASH.
Remedy: DEALERS WILL REPLACE THE SWITCHES FREE OF CHARGE. THE SAFETY RECALL BEGAN ON AUGUST 15, 2011. OWNERS MAY CONTACT FORD MOTOR COMPANY CUSTOMER RELATIONSHIP CENTER AT 1-866-436-7332.
EQUIPMENT:ELECTRICAL · 07E066000
2007-08-28
CERTAIN CEQUENT 90 DEGREE 7-WAY RIGHT ANGLE ADAPTORS SOLD BY DISTRIBUTORS IN TOW PACKAGES FOR AFTERMARKET SALES TO TOW 5TH WHEEL RV TRAVEL TRAILERS. DUE TO INCORRECT WIRING OF THE HARNESS, THE TRAILER LIGHTS MAY NOT OPERATE PROPERLY.
Consequence: IF THE TRAILER LIGHTS ARE NOT WORKING PROPERLY, A VEHICLE CRASH CAN OCCUR.
Remedy: ALL OF THE DEFECTIVE TOW PACKAGES ARE STILL AT THE DISTRIBUTOR LEVEL AND HAVE NOT BEEN SOLD TO ANY CONSUMERS.
ELECTRICAL SYSTEM:12V/24V/48V BATTERY · 04V327000
2004-07-07
ON CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES EQUIPPED WITH 6.0L DIESEL ENGINES, THE ENGINE GROUND STUD THAT ATTACHES THE NEGATIVE BATTERY TERMINAL EYELET TO THE ENGINE BLOCK MAY BE LOOSE.
Consequence: IF THE GROUND WIRE IS LOOSE, ELECTRICAL CURRENT MAY FLOW TO THE RADIO SUPPRESSION STRAP CAUSING IT TO HEAT AND POTENTIALLY MELT OR IGNITE ADJACENT COMPONENTS WHICH COULD RESULT IN A FIRE.
Remedy: DEALERS WILL REPLACE THE ENGINE GROUND STUD AND THE RADIO SUPPRESSION STRAP AND ADJACENT COMPONENTS WILL BE INSPECTED FOR DAMAGE AND REPLACED, IF NECESSARY. THE RECALL BEGAN ON JULY 23, 2004. OWNERS SHOULD CONTACT FORD AT 1-800-392-3673.
Vehicle Info — 2003 Ford F-350
Performance
Horsepower
250hp
Torque
505lb-ft
0–60 mph
10.5sec
Quarter mile
17.8sec
Top speed
95mph
Capability & size
Towing capacity
12,500lb
Payload
3,900lb
Curb weight
6,800lb
Wiper blades
Tenth generation F-Series Super Duty (1999-2004). Standard hook arm configuration.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2003 Ford F-350 7.3L V8 Power Stroke Diesel and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.