Service Bulletin - The shift position indicator ("D" light) starts flashing due to DTC P2817, (Shift solenoid valve O/P [pressure control solenoid H] stuck off) being set. When the TCM checks the drive pulley oil pressure, it misreads the pressure as high even though oil pressure is within specification.
full bulletin at NHTSA ↗2018 Honda Accord powertrain problems
moderate Owners of the 2018 Honda Accord have filed 128 NHTSA complaints about the powertrain, typically surfacing around 19,500 miles at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Failure mileage
Complaints
128
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2014 Accord | 58 |
| 2015 Accord | 36 |
| 2016 Accord | 25 |
| 2017 Accord | 31 |
| 2018 Accord (this page) | 128 |
| 2019 Accord | 37 |
| 2020 Accord | 13 |
| 2021 Accord | 11 |
| 2022 Accord | 6 |
1crash
1injury
When does it fail?
Of the 128 powertrain complaints filed for the 2018 Honda Accord, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 18 model years of Honda Accord we track for powertrain problems, this one carries the most owner complaints on file — 128.
Owners have filed 128 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Service Bulletin - The shift position indicator ("D" light) starts flashing due to DTC P2817, (Shift solenoid valve O/P [pressure control solenoid H] stuck off) being set. When the TCM checks the drive pulley oil pressure, it misreads the pressure as high even though oil pressure is within specification.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2018 Accord powertrain shows a cluster of critical issues spanning the 1.5T and 2.0T engines and the 10-speed automatic transmission. The dominant failure is blown head gaskets on the turbocharged engines—coolant leaks into combustion chambers, triggering misfires and sudden, unintended deceleration from highway speed (70+ mph) to 15–25 mph with zero warning. These events have nearly caused rear-end collisions. Owners report paying $3,000–$6,000 to repair, with some failures recurring weeks after repair. Honda dealers openly acknowledge this as a "known issue" but have issued no recall; Honda corporate denies warranty coverage outside the original period.
The 10-speed transmission exhibits violent low-speed shifts (under 20 mph), especially 2–3 gear engagement, that feel like being rear-ended. Dealers reset the transmission control module and disconnect the battery, with no permanent fix. Owners also report recurring all-warning-light events where the car suddenly loses power and enters limp mode, then recovers after a restart—indicating an electrical or software problem rather than mechanical failure, yet dealers cannot reproduce it during short test drives.
A fuel pump recall remains incomplete as of August 2025, with owners waiting 18–20 months for parts. Cylinder misfires are frequent and persistent; replacement of spark plugs and ignition coils does not resolve them, and fuel injectors (often recommended) are on backorder or discontinued. One dealer's visual inspection at 1,850 miles found a turbo inlet hose loose from the factory. Multiple owners report that dealerships have misdiagnosed these failures, ordering piecemeal repairs that exhaust warranty coverage before the true issue is identified.
Same Honda Accord powertrain reports on nearby years: 2015 · 2016 · 2017 · 2019 · 2020
Failure modes owners describe
Head Gasket Failure / Coolant Intrusion
Blown head gasket allowing coolant to enter combustion chambers, particularly on 1.5T engines. Manifests as coolant loss, white smoke from exhaust, engine misfires, reduced power, and limp mode. Multiple owners report this as a recurring issue with no recall despite Honda's awareness. Repair typically involves head gasket replacement, head bolts, fuel injectors, spark plugs, and belt service.
When: As early as 62,800 miles; ranges from 78,000 to 157,000+ miles. Issues can recur within weeks of repair.
Symptoms owners cite: Coolant loss without visible external leaks; Engine misfire codes (P0303, P0304, P0302); Loss of power / vehicle goes into limp mode (limiting speed to 15-20 mph); Check engine light (flashing during events); Sweet smell under hood; White smoke from exhaust on startup; Rough idle and hesitation under acceleration; Temperature gauge fluctuation; Sudden unintended deceleration on highways from 70+ mph to 25 mph without warning
Codes mentioned: P0303 (Cylinder 3 Misfire), P0304 (Cylinder 4 Misfire), P0302 (Cylinder 2 Misfire), P0300 (Random/Multiple Cylinder Misfire)
Repairs/costs cited: Head gasket replacement ranging from $3,000–$6,000+. Associated repairs: head bolts, spark plugs, fuel injectors, drive belts, valve adjustment, oil change. One dealer quoted $4,000+ for comprehensive repair. Parts noted as on backorder due to volume of repairs.
Recalls/TSBs owners mention: Honda dealers acknowledge this as a 'known issue' in multiple narratives. Honda's service bulletins reportedly reference stretched timing chains as a cause. Some owners report Honda corporate opened 'Good Faith' cases but demanded out-of-pocket diagnostic fees before considering coverage. Warranty claims denied for out-of-warranty vehicles. No official recall issued.
Engine Power Loss / Limp Mode and All-Warning-Light Events
Recurring events where the vehicle suddenly loses engine power, enters limp mode (limiting acceleration to 15–20 mph), and illuminates multiple dashboard warning lights simultaneously (EPS, VSA, brake system, transmission, collision mitigation, emission warnings, etc.). Events occur without prior warning and resolve temporarily when the vehicle is turned off and restarted. Appears to be a software/electrical issue separate from mechanical failure, as the vehicle resumes normal operation after restart.
When: Intermittent; can occur multiple times per month or every few hundred miles. Reported from 45,000 miles onward.
Symptoms owners cite: Sudden loss of engine power while driving; Vehicle limited to 10–25 mph regardless of accelerator input; All dashboard warning lights illuminate simultaneously (EPS, VSA, brake, transmission, collision mitigation, emission, tire pressure, road departure); Check engine light flashing or solid; No mechanical abnormality detected after restart; Temporary loss of throttle response; Vehicle resumes normal operation after power cycle (turn off/restart); Can occur on highways, local roads, and parking lots; No warning prior to failure
Codes mentioned: P0300 (Random/Multiple Cylinder Misfire), U0401-68 (ECM/Electric Powertrain Communication Failure), U0416-68 (VSA/EPS System Malfunction), P0303 (Cylinder 3 Misfire), P2651 (B Rocker Arm Actuator System), P0087 (Fuel Rail/System Pressure)
Repairs/costs cited: Multiple repair attempts without permanent resolution. Owners report spending $1,000–$2,000+ on misdiagnosed repairs (spark plugs, ignition coils, fuel injectors, batteries) without resolving the core issue. One owner replaced battery twice and multiple ignition components with no lasting fix.
Recalls/TSBs owners mention: Dealers unable to reproduce intermittent failures during short test drives. One engineer-owner noted that the vehicle's programming cuts engine power when an electrical fault is detected, regardless of whether the fault is truly mechanical. No TSB or recall identified in these narratives.
Transmission Rough Shifting at Low Speed (10-Speed Auto)
Violent or abrupt transmission shifts at low speeds (under 20 mph), most commonly during 2–3 gear engagement in parking lots or slow-speed driving. Shift feels like a hard clutch engagement or being rear-ended. Occurs intermittently every few hundred miles. Dealers have performed TCM resets and battery disconnections with no lasting fix. Appears to be a software/calibration issue rather than mechanical failure, as smooth shifts occur at higher RPMs and under harder acceleration.
When: As early as under 1,000 miles; reported throughout vehicle's life. Intermittent; every few hundred miles.
Symptoms owners cite: Violent or harsh shift from 2nd to 3rd gear at low speed (under 20 mph); Shift feels like sudden clutch engagement or rear-end impact; Occurs in parking lots and low-speed driving; Occurs with minimal accelerator input; Smooth shifts at higher RPMs or harder acceleration; Occurs regardless of driving style or weather; Objects fall off seats due to violence of shift; Vehicle nearly stalls in intersection during rough shift; Downshift rough engagement; Delayed reverse engagement (up to 3 seconds) followed by hard slam into gear
Repairs/costs cited: Dealers perform TCM (transmission control module) reset and battery cable reset with no lasting resolution. One owner reports draining and filling 5 quarts of Honda 2.0 ATF and replacing transmission filter without resolving the issue. No permanent repair identified in narratives.
Recalls/TSBs owners mention: Multiple dealers claim 'issue not reproducible' or 'this is how it shifts.' One dealer noted that transmission will 'adapt to driving habits within 200 miles'—a statement owners characterize as nonsensical. Honda has not issued a recall or TSB for this issue.
Fuel Pump Recall Delays and Related Issues
An open fuel pump recall for 2018 Accord models remains incomplete as of August 2025, with some owners waiting 18–20 months for parts. Delayed recall repair has led to uncertainty about subsequent failures (head gasket, fuel injector issues). One owner's vehicle became completely inoperable after extended waiting period; another reports worsening engine problems after recall repair completion.
When: Recall ordered January 2024; as of August 2025 still not completed (20 months). Post-recall failures reported within weeks.
Symptoms owners cite: Hesitation around 4,000 RPMs during acceleration; Loss of engine power after hesitation; Flashing check engine light; Dashboard light illumination; Vehicle unable to start after extended wait for recall parts; Engine problems worsening after recall repair completion
Repairs/costs cited: Recall repair alone; no cost to owner for recall itself. However, extended waits result in secondary failures requiring additional repairs. One owner reports $2,000 fuel injector replacement and subsequent head gasket failure ($5,000+) all occurring shortly after or while awaiting recall completion.
Recalls/TSBs owners mention: Dealers inform owners that recall parts are unavailable or on backorder, preventing repair completion. One dealership stated they cannot perform recall repair 'unless there are parts in stock.' Honda corporate has not accelerated part delivery.
Misfire and Fuel Injector Issues
Engine misfire codes (especially cylinders 2, 3, 4) occurring repeatedly. Owners report replacing spark plugs and ignition coils only to have the same misfire code return days or weeks later. Fuel injectors are frequently suspect but are noted as on backorder or discontinued. Some owners report that fuel injector replacement ($2,000) did not resolve the underlying issue, which was later diagnosed as head gasket failure.
When: From 62,800 miles onward; recurs within days to weeks of repair.
Symptoms owners cite: Check engine light (flashing or solid); Engine misfire in one or more cylinders; Rough running engine; Loss of power; Vehicle slowing down during acceleration; Limp mode engagement
Codes mentioned: P0300 (Random/Multiple Cylinder Misfire), P0303 (Cylinder 3 Misfire), P0304 (Cylinder 4 Misfire), P0302 (Cylinder 2 Misfire)
Repairs/costs cited: Spark plug replacement and ignition coil replacement performed multiple times without permanent resolution. Fuel injector replacement ($1,500–$2,000) noted as a frequently recommended fix, but parts are on backorder or discontinued. Owners report that after spending $2,000 on fuel injectors, the true cause (head gasket) was discovered only later.
Recalls/TSBs owners mention: No recall or TSB identified. Fuel injector parts noted as on backorder.
Loose Turbo Inlet Hose (Factory Assembly Issue)
Turbo inlet pipe arriving loose from the factory, causing sudden power loss early in vehicle ownership. One owner discovered the issue at 1,850 miles when the dealership performed visual inspection after initial misdiagnosis of 'bad fuel' or 'ethanol contamination.' Dealership technician noted this issue 'happening more and more' with Accords.
When: Early in vehicle ownership; reported at 1,850 miles.
Symptoms owners cite: Sudden loss of power; Vehicle requiring tow to dealership
Repairs/costs cited: Turbo inlet hose tightened; no parts replacement needed. Dealership performed test drive to confirm fix.
Recalls/TSBs owners mention: No recall issued. Dealership technician attributed to factory assembly issue.
Synthesized from 128 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
All warning indicator lights came on and I took car to a Certified Auto Mechanic who said it was caused by the fuel pump problems surrounding Honda cars. Said it affected the fuel injectors (mis-fire) and I should take it to Honda dealer for fix. Honda dealer said this VIN of my 2018 Honda is not on the recall. I asked about being covered by the 5 year power train warranty and was told that…
Engine oil smells strongly of gasoline. This is the same 1.5l turbo gdi engine that has been recalled already in the civic and crv.
As I was driving myself and child on the interstate 65 mph the vehicle all of a sudden dropped speed and would not accelerate. I drifted the car off the interstate off ramp and pulled into a store parking lot. Luckily, we did not cause an accident or hit anything or anyone. All the lights on car's dashboard blinking some examples are EPS, VSA, Malfunction lamp, Breaking system, check engine…
Had powertrain trouble with your 2018 Honda Accord?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2018 Honda Accord?
It's a documented issue but not catastrophic. 128 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 35 complaints that reported odometer mileage, most powertrain failures cluster between 6,120 and 40,000 miles, with the median around 19,500. A quarter of owners report trouble before 6,120; a quarter make it past 40,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2018/Honda/Accord.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.