2018 Honda Odyssey body problems

Driver and passenger sliding doors fail to close completely or will not close at all using the automatic function. Doors may close only 70–90% of the way, then reopen repeatedly. Owners must press the button multiple times (up to 10 times) to achieve full closure, or manually force the door shut. Latching may feel incomplete, producing a 'cracked window' sound.

When: Occurs intermittently and unpredictably; some instances reported from early ownership (30 days to 6+ years in service), others escalate after recall repairs. One owner reports issue at ~30,000 miles; several report ongoing failures despite two prior recall repairs (campaigns 18V795 and 20V437000).

Symptoms owners cite: Door closes only partially (70–90%) then reopens automatically; Door will not close using power button, requires multiple attempts or manual force; Door sounds like it is not fully latched; produces 'cracked window' sound; Dashboard warning or beeping alerts about door not closed, occurring while driving; Door sensor detects no obstruction but closure still fails; Both driver and passenger doors affected simultaneously on some vehicles

Codes mentioned: B2049 (left slide door motor, cable, and latch fault – reported in complaint #3)

Repairs/costs cited: Dealers have replaced door motors, latch mechanisms, cables, sensors, and door panels. One owner paid $2,500 for parts and labor; another paid $730 labor only after refusing full repair. Dealers report difficulty replicating intermittent failures and cannot always diagnose root cause. Some owners note failed repairs revert to same issue within weeks to months.

Recalls/TSBs owners mention: NHTSA recall campaigns 18V795 (2018) and 20V437000 (2020) addressed power sliding door outer handle cables and rear latches. Multiple owners report problems recurred after recall repairs, suggesting incomplete fix of root cause. One owner states dealer identified 'moisture intrusion and/or latching issue' but does not elaborate on permanent solution.

Sliding doors, primarily the passenger side, open unexpectedly while the vehicle is in motion at various speeds (35–45 mph noted). Dashboard displays door-open warning. In one case, door swung wide open with child aboard; in another, door partially opened while vehicle was going over a speed bump. Some instances occur without explanation; others may be preceded by closure or latching issues.

When: Reported at varying mileages; one case at ~30,000 miles; others after years of ownership. One incident occurred during power-door operation; another while passing over uneven road surface.

Symptoms owners cite: Sliding door opens or partially opens while vehicle is in motion (35–45 mph range reported); Door-open warning or alarm displayed on dashboard while driving; Door may swing wide open or slide open gradually; No apparent prior warning or mechanical issue before sudden opening

Repairs/costs cited: One owner paid $800 for latch replacement after first incident; same failure occurred on opposite door one year later. Another owner, after recall repair (campaign 20V-437), continued to receive intermittent 'door not closed' warnings while driving, though door remained locked.

Recalls/TSBs owners mention: NHTSA recall 20V-437 (2020) addressed sliding door outer handle cables; complaint narratives indicate this recall did not prevent subsequent door-opening incidents or false warnings. One owner reports that the recall repair appears to have caused further damage rather than resolving the issue.

The power tailgate control module, located in the rear driver-side compartment, fails due to water intrusion through defective body seam seals. Water leaks into the module, corroding the circuit board and causing the tailgate to malfunction: it may open spontaneously, fail to lock or close, refuse to open, or become unresponsive to manual or automatic commands. The module is not repairable; replacement is required.

When: Water intrusion often triggered by heavy rain, hurricane conditions, or cold/freezing weather. One incident followed Hurricane Milton; others occurred seasonally during rain or winter. Some owners report water damage appearing months or years into ownership; others after as little as routine weather exposure. One owner documented module failure with ~32,500 miles.

Symptoms owners cite: Tailgate will not open or close using power function; Tailgate opens spontaneously after engine is shut off or while parked; Tailgate refuses to open manually or remains partially open; Constant loud beeping (inside and outside vehicle) at speeds over 1 mph when module fails; Dashboard warning light for 'Power Tailgate Problem' or 'Liftgate Error'; Water damage and corrosion visible on circuit board when module is inspected

Repairs/costs cited: Module replacement cost varies: one owner cited ~$200; another paid $1,200 for full repair. Dealers have replaced the module but note that water intrusion point is difficult to determine definitively. Owners report the leak recurs after module replacement if the structural sealing defect is not addressed.

Recalls/TSBs owners mention: Honda does not appear to have issued a recall for the body seam sealing defect. One owner states Honda refused to accept liability for the body defects. No manufacturer-sponsored water-sealing repair program mentioned in narratives.

Factory roof seam sealer (ditch molding) and rear body seams fail to prevent water infiltration. Water pours directly into the vehicle cabin during rain or from failed rear tailgate surround sealing. Leaks occur at the roof line, rear D-pillar panel, and around the tailgate surround. The structural failure is widespread across the 2018–2020 model years and affects critical electrical modules.

When: Occurs during rain events and heavy weather exposure. One owner reports immediate issue within 30 days of purchase; others report progressive failure over years of operation. One incident explicitly occurred post-Hurricane Milton. Issues escalate in humid climates and cold/freezing conditions.

Symptoms owners cite: Water visibly pouring into cabin from roof or rear seams during rain; Water collecting in the power tailgate control module area (rear driver-side compartment); Water infiltrating rear fuse box area; Visible cracks or separation in roof-to-body seam bonds, particularly near rear D-pillar and tailgate surround; Mildew and mold growth inside vehicle due to persistent moisture

Repairs/costs cited: No permanent repair method identified in narratives. One owner attempted manual sealing; another awaits diagnosis. Dealerships acknowledge the problem but do not have a manufacturer-approved repair procedure. Water damage to electrical modules cannot be reversed; modules must be replaced.

Recalls/TSBs owners mention: No recall issued for body seam sealing defect. Honda investigation into roof seam sealer failures (reported by one owner as 'well-documented and widespread') is not mentioned in any formal campaign notice. One owner's formal safety complaint urged NHTSA to open investigation and mandate a recall.

Driver-side front door becomes difficult or impossible to open in freezing or humid conditions. Key fob unlock does not function; key cylinder is hard to turn. Door may lock immediately after being unlocked, or once locked from inside, cannot be opened from inside using any method (lock switch, handle pull, key fob). Window must be rolled down to operate outside handle, or occupant must exit through rear doors.

When: Occurs primarily in freezing conditions (upper 20s F reported). One incident occurred 30 days after purchase; another in freezing overnight temperatures. Some instances are chronic and occur in humid weather as well.

Symptoms owners cite: Door locks immediately upon unlocking from outside; multiple unlock attempts required; Key cylinder difficult to turn in freezing conditions; Door unlock from inside fails (lock switch, handle, key fob all non-functional); Door acts like child lock is engaged, though child lock is not active; Only workaround is to roll down window and operate handle from outside, or exit via other doors

Repairs/costs cited: No repairs mentioned; owner workarounds suggest design flaw or moisture-related mechanism binding. One dealer stated Honda is investigating the issue; problem unresolved after months.

Recalls/TSBs owners mention: Honda investigation mentioned but no recall or TSB identified. Dealer stated issue is being investigated but no timeline or resolution communicated to owners.

The outer handle cable assembly on power sliding doors fails prematurely. Cable becomes frayed, kinked, or severed, preventing door operation. One owner's cable was held together by only two strands; another owner's cable was kinked and required replacement. Cables are sold as a complete unit with the latch, not separately.

When: Failure occurs at varying mileages: one reported at ~6,500 miles (very early in ownership); another identified during post-recall inspection (~2 years after recall repair in 2020). One owner reported severed cable as part of moisture intrusion issue.

Symptoms owners cite: Cable fraying or kinked appearance when door panel is removed; Cable failure preventing or impeding door operation; Intermittent contact with microswitch during door closing (reported as frayed cable touching switch)

Repairs/costs cited: Replacement cost varies. One owner cited $485 for complete harness replacement with wires kinked. Cable assembly is not sold separately; full latch assembly must be replaced. Multiple owners note this as a repeat failure after prior recalls on same component.

Recalls/TSBs owners mention: NHTSA recall 20V-437 (2020, Campaign A88) specifically addressed sliding door outer handle cables; narrative #10 reports failure of the same cable assembly approximately 5 years post-recall, suggesting either a new defect or incomplete prior recall fix.

Sunroof glass cracks or shatters spontaneously without impact. One vehicle had sunroof shatter at highway speeds with only 2,500 miles; another experienced glass breakage as vehicle came to a stop. Dealers and Honda attribute breakage to unknown external impact without thorough investigation. Honda refuses to cover under warranty.

When: One incident at 2,500 miles (very early ownership); another during low-speed stop/exit maneuver. Two separate vehicles reported.

Symptoms owners cite: Sunroof glass breaks or shatters into pieces spontaneously; No apparent external impact or cause

Repairs/costs cited: One dealer covered with temporary wrap; full replacement cost not specified. Another owner demanded investigation before paying repair costs.

Recalls/TSBs owners mention: Honda does not cover under warranty. Dealers attribute to external impact without performing thorough pre-repair investigation. No recall or investigation mentioned.

Power sliding door pinch sensors malfunction or fail, causing the door to reopen when closing, or fail to detect obstructions. Door closure may be blocked by a non-functional sensor, or the sensor may give false readings. In one case, the door stopped closing after a software update.

When: Intermittent failures reported throughout ownership. One owner reports issue began or worsened after a dealer software update.

Symptoms owners cite: Pinch sensor detects no obstruction but door still fails to close; Door gives three beeps and stops closing attempt; Door reopens when attempting to close despite no obstruction; Issue persists even after unplugging and reinserting sensor; Motor works briefly after sensor reset, then fails again shortly after

Repairs/costs cited: Dealers have replaced sensors on both sliding doors. One owner attempted independent troubleshooting by unplugging sensor and confirmed it functions correctly when tested in isolation, but system still fails after reinsertion.

Recalls/TSBs owners mention: No recall specific to sensor malfunction identified. One owner reports dealer did software update that triggered or worsened the closure issue.

Power sliding door operation is affected by window position. When windows are down, the door does not 'click' or latch properly into the open position and can slide shut on its own or when parked on a slope. This creates a pinch hazard for children. When windows are up, the door clicks and locks in place correctly.

When: Occurs consistently when windows are in down position; not an intermittent failure.

Symptoms owners cite: Door does not 'click' or latch when windows are down; Door slides shut on its own when windows are down, especially on inclines; Door may close suddenly and unexpectedly on occupant trying to exit; Door operates normally when windows are up

Repairs/costs cited: No repairs reported; issue appears to be design flaw related to air pressure or seal mechanism. Owner's workaround is to keep windows closed when operating sliding doors.

Recalls/TSBs owners mention: No recall or TSB mentioned.

The gas struts or hydraulic shocks supporting the rear tailgate weaken and fail prematurely, causing the tailgate to open fully and then lower uncontrollably while owner is unloading cargo. Tailgate can unexpectedly lower to mid-open position and strike occupant overhead.

When: Failure at low mileage: one owner reports tailgate strut weakness at ~32,500 miles.

Symptoms owners cite: Tailgate opens fully and then slowly lowers while owner is unloading; Tailgate suddenly drops to mid-open position without warning; Potential for tailgate to strike head/body of occupant standing nearby

Repairs/costs cited: Owner incurred injury from dropped tailgate. Owner reports avoiding use of automatic tailgate function due to safety risk.

Recalls/TSBs owners mention: No recall or manufacturer response identified.

One 2018 Odyssey caught fire while operational, appearing to originate near the third-row driver-side seat. Vehicle was smoking, then fully ignited with a child aboard. Wife was able to evacuate and a passerby assisted in controlling the fire until emergency services arrived. Cause not determined; Honda investigation ongoing at time of complaint.

When: Incident occurred April 24, 2019, on highway during normal operation.

Symptoms owners cite: Smoke appearing from vehicle interior; Vehicle ignition and fire, apparent origin near third-row driver-side seat area

Repairs/costs cited: Vehicle destroyed. Owner working with insurance (GEICO) and Honda (Case# 09517538) to determine cause. Owner referred to NHTSA by NTSB for investigation.

Recalls/TSBs owners mention: Honda investigation initiated; owner awaiting findings. No recall or determination of cause mentioned in complaint.

The panel behind the gas and brake pedals is missing or absent on the 2018 model, exposing a large area of unprotected electrical wiring. Drivers can easily reach the wiring while stretching legs, creating a fire hazard and electrical shock risk. Earlier model years (e.g., 2006) had this area covered.

When: Present on vehicle at time of complaint; chronic design issue for 2018 model year.

Symptoms owners cite: Missing or incomplete panel under pedals; Exposed electrical wiring visible and accessible; Risk of accidental foot contact with wiring while stretching

Repairs/costs cited: Dealer stated this is normal for 2018 models; no repair or upgrade offered.

Recalls/TSBs owners mention: Honda considers exposed wiring normal for 2018 model year; no design change mentioned.

Power sliding door closes unexpectedly on occupant while door is being held open or while occupant is partially outside the vehicle, causing pinning or near-pinning. In one incident, owner was pinned between door and door frame while removing items. In another, door nearly closed on child and preschool teacher during opening sequence.

When: Incidents reported while parked and stationary. One at 15,000 miles. Multiple instances on same vehicle in some cases.

Symptoms owners cite: Door closes unexpectedly while occupant is using door opening; Door bounces closed and open intermittently during operation; No warning or obstruction detected before closure

Repairs/costs cited: No repairs performed in reported incidents; incidents occurred at low mileage and early ownership.

Recalls/TSBs owners mention: No manufacturer response or recall identified.

Passengers side middle/rear door latch fails to hold the door closed, particularly during rainy or winter conditions. Door does not latch fully or latching is intermittent. Door may feel like it is not fully seated when closed.

When: Failures reported during or after rainy/winter seasons. One incident involved freeway driving with child in car seat.

Symptoms owners cite: Door does not fully latch or lock properly; Door feels loose or incompletely seated when closed; Failures more common during wet/rainy weather or winter

Repairs/costs cited: One owner reports dealer may have addressed latch issue, with reduced frequency of problem after service call. However, on the opposite side, intermittent closure issues persist.

Recalls/TSBs owners mention: No specific recall for middle/rear door latch identified; some repairs appear to have been done under warranty or service campaigns.