The 2016 Ford Explorer generates a consistent pattern of engine and cooling system failures across this complaint cluster. The internal water pump design is the most serious: owners report sudden coolant leaks, engine overheating, and stalling on highways and in intersections at 50,000–136,000 miles, with little to no warning. Because the pump is mounted inside the engine, repair requires dropping the entire engine, driving labor costs to $2,200–$9,000 for a $70–$200 part. Coolant mixing with oil can seize the engine without gradual indication, leaving drivers stranded or in traffic.
The electronic throttle body fails without warning, causing loss of power at highway speeds (65 mph dropping to 15 mph or complete shutdown). Service technicians acknowledge Ford knows about this problem, yet no recall has been issued.
Exhaust fumes and carbon monoxide are entering cabins—especially during acceleration or highway driving with air conditioning on. Owners measure CO levels from 17 to 112 ppm while driving, with headaches, nausea, dizziness, and prolonged health complaints reported. Ford's Technical Service Bulletin 17-0044 (sealing seams, reprogramming A/C, replacing exhaust parts) fails to resolve the issue in most cases, even after multiple dealer visits.
Coolant intrusion into combustion chambers, blown head gaskets, crankcase sensor failures, and transmission problems round out the mechanical defects owners face. Build quality issues include unfastened belt tensioner bolts at the factory on brand-new vehicles. Most repairs fall outside warranty, and Ford generally denies coverage or assistance, particularly for non-original owners.
Failure modes owners describe
Water pump failure with internal location causing engine damage
Water pump mounted inside the engine fails and allows coolant to leak into the oil pan and/or combustion chambers, causing engine seizing, overheating, or catastrophic engine failure. Failure typically occurs between 50,000 and 136,000 miles with little or no warning. Engine must be removed to access pump, making repair labor-intensive and expensive ($2,200–$9,000 quoted). Owners report sudden stalling on highways and in intersections, creating immediate safety hazards.
When: 50,000–136,000 miles; some failures with as little as 50K miles; most commonly reported 100K–120K range
Symptoms owners cite: Coolant leaking from underneath vehicle; Engine overheating with temperature gauge in hot zone; Check engine light illuminated (sometimes flashing); Engine smoking or steam visible; Sudden loss of power and engine stalling without warning; Rough idle or hesitation during acceleration; Coolant in oil (confirmed by mechanic diagnosis); Screeching sound from engine area
Codes mentioned: P0300 (random misfire), Check engine light (various codes depending on damage extent)
Repairs/costs cited: Entire engine requires removal to access pump and perform replacement. Typical costs $2,200–$9,000 primarily labor. One owner quoted $4,000 for water pump and timing chain replacement. Timing chain, valve cover gaskets, spark plugs, and camshaft sprockets often need replacement simultaneously. In severe cases, full engine block or long block replacement required ($12,000–$15,000).
Recalls/TSBs owners mention: Ford dealers acknowledge the problem as 'common failure' and that pump usually fails around 150,000 miles (one technician statement). Canada issued a class-action recall for the same Duratec V6 engine. U.S. Ford has not issued a recall. Ford offers no assistance to non-original owners. Extended warranty policies typically do not cover engine block as non-moving part. One customer service representative stated 'no fix currently available for the known problem.'
Electronic throttle body malfunction causing sudden loss of power
Electronic throttle body fails suddenly, causing vehicle to enter limp-home mode or complete loss of engine power while driving at highway speeds. Wrench light and check engine light illuminate. Vehicle slows from 65 mph to 15 mph or shuts down entirely without warning. Issue occurs within weeks to months of ownership, often at low mileage. Service technicians report seeing 'a lot' of 2016 Explorers with the same exact problem and confirm Ford is aware.
When: Low mileage (8,400 miles reported); can occur within first few months of ownership; no clear mileage pattern in narratives
Symptoms owners cite: Vehicle shimmies or shudders; Complete loss of acceleration or power; Wrench light illuminated on dash; Check engine light illuminated; Vehicle enters limp-home mode (severely reduced power); Vehicle stalls or shuts down without warning; Hesitation when starting engine
Codes mentioned: Wrench light (powertrain fault indicator), Check engine light
Repairs/costs cited: Electronic throttle body replacement; part cost approximately $200–$300 but labor varies. One owner reported ~$1,000 out-of-pocket cost. Service technicians note part is usually in stock at dealerships. Replacement often resolves issue immediately.
Recalls/TSBs owners mention: Ford is aware of the problem per service technician statements. One technician stated dealership has had 'a lot' of 2016 Explorers come in with identical throttle body problem and 'Ford is aware.' Ford issued Technical Service Bulletin (TSB) or possible campaign notice (Campaign #16B32 referenced). No recall issued despite awareness. One owner's VIN was claimed 'not affected' by Ford customer service despite having the defect.
Exhaust fumes and carbon monoxide entering cabin
Exhaust odor (often described as rotten eggs, burnt hair, or sulfurous smell) enters cabin through ventilation system, particularly during acceleration or highway driving with air conditioning on, especially with recirculation mode active. Carbon monoxide (CO) levels measured by owners range from 17 ppm to 112 ppm during hard acceleration on inclines—far exceeding safe levels. Symptoms include headaches, dizziness, nausea, lightheadedness, and in one case, prolonged exposure linked to sinus symptoms and ongoing health complaints. Problem persists after Ford's recommended Technical Service Bulletin (TSB 17-0044) repairs.
When: Begins early in ownership (as early as delivery for new vehicles; within months for used purchases); consistent throughout ownership; worsens with higher speeds and acceleration
Symptoms owners cite: Foul exhaust smell in cabin (rotten eggs, sulfur, burnt hair, vomit-like odor); Smell triggers or worsens with hard acceleration or highway speeds; Smell worse when air conditioning running with recirculation on; Headaches and migraines; Nausea and vomiting sensation; Dizziness and lightheadedness; Disorientation and confusion; Drowsiness; Shortness of breath; Chest pain and sweating; Lingering sinus and headache symptoms following exposure
Codes mentioned: No specific diagnostic codes reported; issue identified by owner testing and dealer observation
Repairs/costs cited: Ford TSB 17-0044 prescribes: sealing underbody seams, reprogramming rear air conditioning, replacing exhaust components (mufflers, tail pipes, air extractor vents), and replacing rear bumper drain plugs. One dealer also mentioned replacing PTU (power transfer unit) under warranty after CO detector confirmed fumes. Despite these repairs, problem persists in majority of cases. Some owners report smell 'less' but still noticeable; others report no improvement. Repairs have been completed multiple times (up to 7 dealer visits) without resolution.
Recalls/TSBs owners mention: Ford acknowledges problem via TSB 17-0044. One service director explicitly told owner 'you cannot prove there was any exhaust fumes or carbon monoxide inside the cabin' despite CO detector readings. Dealer noted manufacturer reprogramming rear A/C to slow or halt fans under braking scenarios. One owner was told exhaust deflection issues and rich fuel mixture under acceleration suspected as causes. Ford denies elevated CO found in regular vehicles (claims it is police interceptor issue only), contradicted by owner measurements of 17–112 ppm. No full remedy provided; Ford states they have done 'all they can' per corporate instructions.
Coolant intrusion into head gasket and combustion chamber
Coolant leaks into the cylinder head and combustion chamber, mixing with engine oil or entering the combustion process. This causes engine misfires, rough cold starts, overheating, and potential catastrophic engine failure. Owners report checking codes and finding misfire faults. In one case, coolant intrusion was diagnosed as the root cause after a prolonged investigation; in another, coolant was found bubbling in the reservoir indicating active leakage into the engine. Risk of fire or engine seizing while driving.
When: Reported at 80,000 miles (blown head gasket scenario); also at 50,000 miles (another case); can occur at lower mileage with no prior warning
Symptoms owners cite: Check engine light illuminated, often for cylinder-specific misfire codes; Rough or strange engine sound at startup, especially in cold conditions; Engine hesitation and sluggish response; Coolant leaking onto the ground; Coolant bubbling or foaming in reservoir; Engine overheating with high temperature gauge reading; Evidence of coolant in the cylinder head upon inspection
Codes mentioned: P0300 (random misfire), Cylinder-specific misfire codes (P0301–P0308)
Repairs/costs cited: One case: head gasket and engine block replacement quoted at $15,000 (long block replacement). Another case: mechanic diagnosed blown head gasket requiring $4,600 repair; this was the 3rd Explorer-EcoBoost with same issue seen by that garage in 8 months. One independent mechanic noted the coolant intrusion was related to a design/manufacturing issue with the engine block.
Recalls/TSBs owners mention: Ford denied liability in one case (vehicle under 50,000 miles) claiming damage was 'done before warning lights came on.' No recall issued. One dealer indicated extended warranty does not cover engine block as it is not considered a 'moving part' and failure is attributed to 'manufacturer quality of the block.' Ford has issued recalls for same issue on 2.0 EcoBoost (Ford Escape model); 2.3 EcoBoost Explorer not included despite identical block.
Belt tensioner bolts not tightened at factory
Bolts securing the belt tensioner are found almost completely loose on a vehicle with only 1,681 miles, indicating failure to tighten during factory assembly. This is a quality control issue at the manufacturing plant that could allow the belt to slip or tensioner to detach, causing loss of engine accessory drive functions and potential catastrophic malfunction.
When: Detected at 1,681 miles during owner inspection; never driven before discovery
Symptoms owners cite: Bolts visually observed to be almost completely unscrewed/loose
Repairs/costs cited: Dealership tightened bolts; invoice indicates bolts were never tightened at factory during assembly.
Recalls/TSBs owners mention: Dealership confirmed bolts were never tightened at the factory. Owner opened case with Ford (Case #CAS-9331585) requesting immediate service notice for all 2016 Explorers to check tensioner bolts. Owner was told 'no one will probably get back with you regarding this issue.' No service bulletin or recall issued.
Engine overheating due to coolant leak with minimal or late warning
Engine begins overheating due to coolant system leaks (often water pump-related, but sometimes other cooling system failures), with temperature gauge remaining in normal range or showing only late warning before critical overheating. One case reports no warning light until 2 minutes after check engine light appeared; another describes a situation where coolant leaked out completely with no prior indication. Risk of sudden engine stalling or catastrophic failure in traffic.
When: Can occur suddenly with little notice; one case occurred after only 2 minutes of initial check engine warning; occurs at various mileages (50K–120K miles)
Symptoms owners cite: Engine overheating message displayed late or only seconds before critical failure; Check engine light illuminated briefly before critical overheating; Temperature gauge reading high (H) position; Engine smoking or steam visible; Coolant reservoir empty or level dropping rapidly; Engine stalling without warning while driving
Codes mentioned: Check engine light (various codes), Engine overheating warning message
Repairs/costs cited: One case: mechanic diagnosed water pump failure requiring replacement. Another: engine block replacement quote $12,000. Multiple cases show labor costs of $2,200–$4,000 for water pump and supporting component replacement.
Recalls/TSBs owners mention: One dealer told owner 'clear the code and trade it in immediately or wait till the engine blows up.' Ford customer service denied warranty claim due to mileage (over 100K miles). Dealers acknowledge the problem but offer limited assistance.
Crankcase sensor malfunction causing sudden engine shutdown
Crankcase sensor fails suddenly without prior warning code, causing complete engine shutdown while driving. When the sensor fails, pressure builds up in the engine, damaging downstream components including turbo intake hose and turbo itself. Engine shuts down immediately upon sensor failure with no gradual degradation or early warning from check engine light.
When: Occurs suddenly without pattern; no prior check engine light before failure
Symptoms owners cite: Engine stalls without warning while driving; No engine codes or warning lights before failure; Pressure buildup in crankcase; Secondary damage: turbo intake hose bursts; Turbo malfunction caused by pressure buildup
Codes mentioned: Check engine light (only after component failure)
Repairs/costs cited: Crankcase sensor replacement ($150 part) plus turbo intake hose and turbo replacement (~$4,000 total repair cost). Ford parts department confirmed sensor 'will go out without any warning at all and will shut the engine down completely.'
Recalls/TSBs owners mention: Ford acknowledged through parts department that sensor fails without warning and causes shutdown.
Transmission failure or delayed acceleration response
Vehicle experiences failure to accelerate while in drive or reverse, or delayed response when accelerator pedal is depressed. One case involved failure in both gears after water pump repair; another involved downshifting on its own unexpectedly, especially uphill. In one case, the issue arose after a VLA emission update by dealer. Vehicle may be stuck in low gear or unable to generate power on demand.
When: One case occurred months after water pump replacement; another post-VLA update at 51,000 miles; various mileages reported (51K–102K)
Symptoms owners cite: No acceleration response when depressing accelerator pedal; Failure to accelerate in drive or reverse gear; Delayed acceleration response; Unexpected downshift on its own; Downshift especially pronounced when driving uphill; Vehicle stuck at low speeds despite throttle input
Repairs/costs cited: One case: dealer diagnosed transmission failure and provided repair estimate but work was not completed; vehicle remained unrepaired with independent mechanic. After VLA update: dealer diagnosed EGR throwing coolant into turbo, causing overheating and fuel gauge inaccuracy. Case closed by dealer unable to remedy.
Recalls/TSBs owners mention: After VLA emission update, one case was referred to manufacturer (Case #407224) but case was closed by dealer unable to remedy failure. Manufacturer had assured owner prior to update that vehicle would not be affected.
Engine full throttle condition uncontrolled by driver
Engine enters full throttle mode while driver adjusts pedal position on steering column, and throttle does not respond to normal brake or shift control. Engine races at full RPM repeatedly even after braking and attempting to shift to neutral. Extremely dangerous condition mimicking stuck accelerator.
When: Occurred during routine pedal position adjustment while driving at 55 mph with cruise control active
Symptoms owners cite: Engine suddenly enters full throttle mode without driver input; Uncontrolled acceleration despite brake pedal input; Throttle returns to normal briefly when brakes applied hard, then repeats; Shift to neutral does not stop throttle; Cruise control deactivation does not stop throttle; Issue resolves only when engine is shut off and restarted
Repairs/costs cited: No repair mentioned; owner reported incident to Ford but had not heard back at time of complaint.
Recalls/TSBs owners mention: Owner reported to Ford; no response mentioned.
Head bolt or internal engine component failure
Crankshaft failure diagnosed by manufacturer field technician sent to dealership after multiple rear main seal replacement attempts failed to stop oil leaking. Oil leak persisted despite two separate rear main seal replacements, eventually traced to crankshaft failure requiring entire engine replacement.
When: Failure occurred around 82,700 miles
Symptoms owners cite: Oil leaking onto the ground when vehicle parked; Burning odor inside vehicle abnormally strong; Leak persists despite repairs
Repairs/costs cited: Rear main seal was replaced twice without success. Manufacturer field technician diagnosed crankshaft failure requiring engine block replacement. Vehicle was not repaired. Manufacturer refused assistance due to warranty expiration.
Recalls/TSBs owners mention: Manufacturer field technician was sent to dealership for diagnosis. Manufacturer then refused to assist, citing warranty expiration as reason.
A-pillar trim detachment and poor assembly quality
Driver's side A-pillar trim detaches from vehicle while at car wash. After dealership replacement, trim becomes loosened again shortly after pickup. Suggests assembly or bonding defect. This is related to NHTSA Campaign #24V031000 (structure), with parts not yet available for recall repair.
When: Detachment occurred at car wash; re-loosening occurred shortly after first replacement
Symptoms owners cite: A-pillar trim visibly detaches from vehicle; Trim becomes loose again after replacement
Repairs/costs cited: A-pillar trim replaced at dealer twice.
Recalls/TSBs owners mention: Manufacturer issued NHTSA Campaign #24V031000 for structure, but parts not yet available for recall. Manufacturer referred customer to NHTSA hotline.
Engine overheating and coolant contamination after emission update
After dealership performed VLA emission computer update, vehicle began experiencing coolant system problems including overheating, fuel gauge inaccuracy, and EGR throwing coolant into turbo. The update appears to have caused or exacerbated cooling system issues.
When: Occurred within days after VLA emission update at 51,000 miles
Symptoms owners cite: Engine tends to overheat following update; Fuel gauge does not accurately display fuel level; EGR valve throwing coolant into turbo system; Delayed acceleration response; Unexpected downshifting, especially uphill
Repairs/costs cited: Dealer unable to remedy issue; case closed by manufacturer.
Recalls/TSBs owners mention: Owner was told by Eco Hotline prior to update that vehicle would not be affected. After failure, case #407224 was opened but closed because dealer could not remedy issue. Manufacturer did not provide alternative solution.
Synthesized from 336 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.