2006 Ford F-150 Problems

What owners report

Owners of this model year report a wide spread of problems across the truck, with brake complaints filed at the lowest mileage and frame corrosion cited most often in recent years. Many complaints center on the 5.4L and 4.6L V8 engines, particularly spark plugs that break or eject from the cylinder head, and on the fuel pump control module mounted on the rear frame that corrodes and cuts fuel supply.

1. 1
   Brakes

   Frame and subframe rust-through

   Mentioned in 9 of 60 sampled complaints

   Complaints describe rust spreading through the rear frame rails, subframe and body mounts, in some cases thinning or breaking the rail so the bed sits low or touches the cab. Several owners say the truck had been garage kept and showed little rust on body panels, and that mechanics warned the frame was too far gone to repair. According to the complaints, dealers did not offer assistance and the manufacturer told owners no recall applied to this model year. Mostly reported between roughly 78,000 and 230,000 miles, often on trucks used in salt-belt states.

   What to check: Inspect the rear frame rails, subframe and the area above the rear axle with a flashlight or on a lift; be wary of fresh undercoating over rough or flaking metal.

   2 excerpts from owner complaints in NHTSA records

   “I purchased this 78,400 mile vehicle from an internet sale in sept/oct. 2019, within a few days of delivery, while taking it around for maintenance appraisals (brakes, etc.), one of the shops warned me of major frame rust. A visual inspection shortly thereafter showed the main frame members were rusted through and partially collapsed from the weight of the truck while being lifted on a rack.”

   NHTSA complaint #11373062, filed 2020-11, 78,450 miles

   “I brought my 2006 f150 in for service the other day, and my mechanic pointed out a rust hole on my frame that showed up. After I scraped some of the surface rust off, I found that a large portion of my drivers side frame rail had significant rot spreading. My truck had just barely above 90,000 miles on it, with no other rust on any of the body panels. I drive a company vehicle during the week, and my truck barely gets driven all year. …”

   NHTSA complaint #11395983, filed 2021-02, 92,000 miles
2. 2
   Engine

   Spark plug ejection and breakage in the cylinder head

   • 66 complaints (11%)
   • median 83,767 mi at 5.8 yrs old (62 state mileage)
   • 3 mention a crash, fire or injury
   • owner-quoted repair $900 (median of 18 quotes)
   • filed 2008–2025

   Owners describe a sudden loud bang or popping from the engine bay, followed by rough running, misfire or loss of power; some report the truck still running on fewer cylinders or stalling altogether. Complaints say the spark plug either blew out of the head and damaged the threads, or seized and snapped off during a plug change, requiring drilling or head work. Repair bills reported by owners run into the hundreds to thousands of dollars. Reported from very low mileage up to about 140,000 miles, with many cases around the 50,000-100,000 mile range and often during routine plug replacement.

   3 related service bulletins

   What to check: Ask whether the plugs have been replaced and who did the work; listen for an exhaust-like ticking (a sign of a loose or ejected plug) and request a compression check if records are thin.

   2 excerpts from owner complaints in NHTSA records

   “On november 16,2011 I was on my way to see my mother who passed away and while driving it sounded like a bomb went off and I had vehicle towed and it was spark plug issue, then two years later it happened again, I changed on plugs and coil packs at garage, now two years later another 3rd plug breaks into engine, now in need of new engine. Miles are over class action suit but not by many. My truck is worthless for fords lack of fixing this issue. I do have documents to show. …”

   NHTSA complaint #10861642, filed 2016-04, 70,000 miles

   “My 2006 F-150 with the 4.6l motor ejected a spark plug from the cylinder without warning. I went to crank the vehicle on 2/19/10, and there was a horrendous knocking or tapping sound. I was on my way out of town, so I did not have time to do a thorough check of what could be wrong. I shut the vehicle off and left it sitting until I returned on 2/21/2010. Upon looking, I noticed that the second cylinder in from the firewall on the passenger side had ejected the plug from the cylinder well. …”

   NHTSA complaint #10312533, filed 2010-02, 59,339 miles
3. 3
   Steering

   Loss of power assist or stiff steering

   • 36 complaints (6%)
   • median 62,000 mi at 5.8 yrs old (35 state mileage)
   • 1 mention a crash, fire or injury
   • filed 2005–2020

   Owners report the steering suddenly becoming heavy and hard to turn, sometimes with a noise from the column or wheel, or steering that feels choppy and does not return smoothly to center. Complaints describe a seized lower steering column shaft or joint on some trucks, and a loose rack-and-pinion mounting on others. According to the complaints, dealers diagnosed and quoted repairs but the vehicles were often left unrepaired. Mostly reported between about 400 and 100,000 miles, occasionally within the first few thousand miles.

   What to check: Turn the wheel lock to lock at idle and listen for noise or binding, and check the steering shaft and rack mounting bolts for corrosion or looseness.

   2 excerpts from owner complaints in NHTSA records

   “While driving I noticed that the steering seemed sloppy and unresponsive. Difficult to keep the vehicle in the lanes especially going into or out of curves. Upon reaching my destination I asked my associate to observe the steering components while I turned the wheel with the engine off. He immediately noticed the entire rack and pinion assembly shifting back and forth. Upon further inspection I found that of the two bolts that hold the unit to the chassis one had a loose nut and the other had no nut at all. …”

   NHTSA complaint #10146590, filed 2005-12, 400 miles

   “Power steering becomes 'hard'. Steering wheel suddenly becomes stiff and difficult to handle. Hard to turn. Choppy while turning and snaps back in increments instead of a smooth, easy return to center. Feels like manual steering then returns to power steering. Occurs at any speed, very dangerous at higher speeds. Makes the vehicle steer 'choppy' and unpredictable. Have stopped using the vehicle, causes a dangerous situation while driving and trying to maintain control of the truck.”

   NHTSA complaint #10434946, filed 2011-11, 48,000 miles
4. 4
   Fuel system

   Fuel pump control module corroded by road salt

   • 55 complaints (9%)
   • median 70,000 mi at 7.2 yrs old (51 state mileage)
   • 2 mention a crash, fire or injury
   • owner-quoted repair $552 (median of 7 quotes)
   • filed 2006–2017

   Complaints describe the engine cranking but not firing, or shutting off while driving, sometimes after misfiring briefly. Owners say the fuel pump control module is mounted on a rear crossmember above the spare tire, where salt and debris collect and eat through the metal housing, letting water in and shorting the module. Several were told this is a common failure in northern states, and that a module replacement restored the truck. Typically reported between about 32,000 and 145,000 miles, generally on vehicles driven in winter road-salt areas.

   What to check: Look at the module on the rear frame crossbar near the spare tire for a corroded or perforated case; ask whether it has been replaced and whether the truck spent winters in a salt state.

   2 excerpts from owner complaints in NHTSA records

   “Went to start truck and engine would crank but would not fire. I tried the starting fluid test to see if it was an ignition problem or fuel problem. Gave a little shot of starting fluid into the intake and then tried to start. Motor acted like it was going to start but never started beings I didn't give it enough starting fluid to start because I'm not a fan of using it. With that I eliminated the ignition had to be fuel. …”

   NHTSA complaint #10561160, filed 2014-01, 52,500 miles

   “Driving on interstate 90 in michigan truck started misfiring and about 1000 feet later the engine quit altogether. Replaced the fuel pump module which the mechanic said was very common in northern states. Corrosion between dissimilar metals caused the module case to break and allow water inside and short the module out.”

   NHTSA complaint #10406051, filed 2011-06, 32,000 miles
5. 5
   Brakes

   Brake pedal low or requiring extra force

   • 83 complaints (14%)
   • median 42,997 mi at 3.3 yrs old (76 state mileage)
   • 19 mention a crash, fire or injury
   • filed 2006–2025

   Owners describe the brake pedal sinking toward the floor or needing hard pressure to slow the truck, sometimes returning to normal afterward. A few complaints tie the symptom to the brake booster vacuum supply hose at the intake manifold, which can swell and detach, and one owner was told the booster vacuum line had failed. Dealers in other cases replaced the master cylinder or could not find the cause. Reported from under 4,000 miles through about 145,000 miles, with several cases in the 30,000-50,000 mile range.

   Recall 08V208000

   What to check: Ask whether the brake booster vacuum hose recall work (campaign 08V208000) was done for this VIN, and test the pedal for firmness and travel with the engine running.

   2 excerpts from owner complaints in NHTSA records

   “The contact stated while the brake pedal is depressed it goes past the accelerator pedal all the way to the floor. The vehicle was taken to the dealer for inspection. The master cylinder was replaced in an attempt to correct the problem. However the problem still persists. The vehicle was taken back to the dealer, and the contact was then told this is the way the vehicle was manufactured.”

   NHTSA complaint #10151653, filed 2006-03, 3,400 miles

   “The contact owns a 2006 Ford F-150. The brakes failed while the contact was driving in reverse. The dealer stated that the vacuum line to the booster failed and needed to be replaced. The speed was unknown. The current mileage was 36,111 and failure mileage was 36,050.”

   NHTSA complaint #10219266, filed 2008-02, 36,050 miles

Buying note. Check the frame and rear subframe for rust first, then confirm the spark plugs, fuel pump control module and brake vacuum hose have been serviced. Records of routine maintenance help, but the frame condition is the item most likely to decide whether the truck is worth keeping.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.