Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 Clarity.
Defined by a powertrain requiring 3.5 quarts of 0W-20 oil, the 2021 Honda Clarity presents a specific mechanical profile alongside a stable position in the vehicle's reliability history. This standing is evidenced by zero recalls and a total of only three owner complaints, with the Forward Collision Avoidance system accounting for the top complaint area. The minimal volume of reported issues suggests a largely trouble-free ownership experience, marking this iteration as a low-risk chapter within the model's reliability history.
Fluid capacities, tune-up values and fuel economy at a glance.
Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.
From the factory this vehicle uses a BCI 51R · 500 CCA battery. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.
Engine, drivetrain, dimensions and economy.
| Overall length | 192.9 in |
| Overall width | 74.8 in |
| Overall height | 58.3 in |
| Wheelbase | 108.3 in |
| Curb weight | 4063 lb |
| Track (front / rear) | 62.2 / 62.6 in |
| Weight distribution (front / rear) | 57/43 |
0–60 mph, quarter-mile, horsepower and torque from independent road tests.
Independent road tests for the Clarity of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.
| Year | Trim / engine | 0–60 | ¼ mile | HP | Drivetrain |
|---|---|---|---|---|---|
| 2019 | Touring Plug-In Hybrid Sedan 1.5L I-4 + Elec 17.0-kWh | 7.60 sec | 16.10 sec | 212 hp | FWD |
| 2018 | Touring Plug-In Hybrid Sedan 1.5L I-4 + Elec 17.0-kWh | 7.50 sec | 15.90 sec | 212 hp | FWD |
| 2018 | Touring Plug-In Hybrid Sedan 1.5L I-4 + Elec 17.0-kWh | 7.70 sec | 16.20 sec | 212 hp | FWD |
| 2017 | Fuel Cell Sedan Electric 103-kW 1.7-kWh | 7.80 sec | 16.20 sec | 174 hp | FWD |
| 2017 | Fuel Cell Sedan Electric 103-kW 1.7-kWh | 8.10 sec | 16.40 sec | 174 hp | FWD |
Capacities, torques and tune-up values from the factory service manual.
This engine holds 3.5 qt of 0W-20 engine oil, DOT 3 brake fluid. Torque lug nuts to 80.0 ft-lbs. The firing order is 1-3-4-2.
| Automatic Transmission Fluid | ATF |
| Automatic Transmission Fluid Capacity | 2.23 qt |
| Brake Fluid | DOT 3 |
| Engine Coolant | Honda Long Life Antifreeze/Coolant Type 2 |
| Engine Coolant Capacity | 5.2 qt |
| Engine Oil | 0W-20 |
| Engine Oil Capacity | 3.5 qt |
| Crankshaft Position (CKP) Sensor Bolt(s) | 9.0 ft-lbs |
| Camshaft Position (CMP) Sensor Bolt(s) | 9.0 ft-lbs |
| Cylinder Head Instructions | Use a beam type torque wrench if available. |
| Engine Coolant Temperature (ECT) Sensor Bolt(s) | 9.0 ft-lbs |
| Oxygen (O2S) Sensor Bolt(s) | 33.0 ft-lbs |
| Knock Sense (KS) Bolt(s) | 16.0 ft-lbs |
| Flex or Driveplate Bolts | Driveplate: 55.0 ft-lbs |
| Engine Flywheel Bolts | 108.0 inch lbs. ft-lbs |
| Lug Nuts | 80.0 ft-lbs |
| Automatic Transmission Drain Plug | Use new washers: Drain: 36.0 ft-lbs |
| Cylinder Firing Order | 1-3-4-2 |
| Curb Idle Speed (No Load) | Transmission in Neutral or Park: 1200 rpm |
| Curb Idle Speed Variance (No Load) | 50 rpm |
| Curb Idle Speed (Secondary Under Load) | Transmission in Neutral or Park: 1200 rpm |
| Curb Idle Speed Variance (Secondary Under Load) | 50 rpm |
| Spark Plug Manufacturer | Honda |
| Spark Plug Gap | 0.039-0.043 in |
| Spark Plug Torque | 16.0 ft-lbs |
| Refrigerant | R1234yf |
| Refrigerant Capacity | 0.87-0.98 lbs |
| Oil Group | POE |
| Oil Type | SANDEN SE-A2 |
| Refrigerant | R1234yf |
| Refrigerant Capacity | .87-.98 lbs |
| Oil Group | POE |
| Oil Type | SE-A2 or equivalent |
| Fuel Pump Pressure Minimum | 46.4 psi |
| Fuel Pump Pressure Maximum | 53.7 psi |
| Regulated Fuel System Pressure (With Vacuum) | 46.4-53.7 psi |
| Engine Oil Pressure | 11.6 minimum psi @ curb idle speed psi |
| Engine Oil Pressure RPM | 47.9 minimum psi @ 3,000 rpms. rpm |
| Brake Caliper Bolt to Carrier Torque | Front: 37.0 ft-lbs; Rear: 26.0 ft-lbs |
| Brake Caliper Carrier to Hub Bolt Torque | Front: 101.0 ft-lbs; Rear: 80.0 ft-lbs |
| ABS Sensor Torque | 6.1 |
| Minimum Pad Thickness | 0.063 in |
| Vented Rotor Minimum Thickness for Replacement | Front: 1.024; Rear: .315 |
| Variation from Parallelism Thickness Variation | .0006" |
| Maximum Rotor Runout | .0016" |
| 1 | Remove the tire and wheel assembly. Step 3: Perform inspection of front suspension bolts, brushings and nuts. Step 4: Replace any loose, damaged or deteriorating parts. Step 5: Perform inspection of ball joint boot for leaks, cracks or any damage. Step 6: Inspect lower control arm by holding the outside and moving up and down. Step 7: Replace control arm if there is any noise or looseness or if the lower control arm and ball joint clearance exceeds specifications. Step 8: Replace ball joint if damaged. | |
| 1 | 84.0 inch lbs., Step 2: 120° | 84 in |
| 1 | 27.0 ft. lbs., Step 2: 90° | 27 ft. lbs |
| 1 | 22.0 ft. lbs., Step 2: 120° | 22 ft. lbs |
| 1 | 22.0 ft. lbs., Step 2: Bolts: 1, 2, 4 & 5: 22°, Step 3: Bolt 3: 32° | 22 ft. lbs |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Owner complaints about the 2021 Honda Clarity dominate in one area — the forward collision avoidance, 1 of 3 reports (33%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 1 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the forward collision avoidance pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.
All 3 complaints on record, top 3 components.
Source: NHTSA Office of Defects Investigation complaint database.
No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.
Showing 4 of 4 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| A21100B | 2022-01-29 | Air Bags | ServiceNews Article - There are several possible causes for the SRS DTC U3000-49… |
| A21100B | 2022-01-04 | Air Bags | ServiceNews Article - There are several possible causes for the SRS DTC U3000-49… |
| A21-084 | 2021-12-16 | Engine And Engine Cooling | Service Bulletin - The MIL comes on with DTC P1F86 FC Cell Voltage Too Low (Caution). |
| A21-084 | 2021-10-26 | Engine And Engine Cooling | Service Bulletin - The MIL comes on with DTC P1F86 FC Cell Voltage Too Low (Caution). |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.
Cross-vehicle references for the kinds of data on this page.
3.5 qt of Honda 0W-20, per the factory manual.
NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.