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2021 Chevrolet Blazer

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 Blazer.

The 2021 Chevrolet Blazer takes 5.28 quarts of 0W-20 oil and logged 123 owner complaints with the electrical system as the top concern alongside a single recall. In the model's complaint history spanning 1990 through 2026, the 2021 tally sits well below the 1995 peak of 1,418 reports but above the 2026 low of just one, placing this model year in the lower-mid range of the nameplate's recorded trouble rate. That positioning suggests the 2021 Blazer carries fewer documented issues than the franchise's worst years while still reflecting more owner-reported problems than the most recent entries.

Model year202620252024202320222021202020191990

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity5.28 qtOEM · verified
Engine oil type0W-20OEM · verified
Lug nut torque140 ft-lbsOEM · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI Only use AGM VRLA Battery vented to the outside of the vehicle. 94R · 720 CCA battery, OE oil filter 25206377. 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.

Battery groupBCI Only use AGM VRLA Battery vented to the outside of the vehicle. 94R · 720 CCAOEM · verified
Tire size235/65R18 106HOEM · verified
Wheel / rim8 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter25206377 alt 12727115
Engine air filter23321606
Spark plug12680074 alt 55504354
Battery88864542
Front wiper blades84574892 alt 84586337
Serpentine belt55488926 alt 12649097
Thermostat55516369 alt 12630780
Cabin air filter13508023

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length191.3 in
Overall width76.8 in
Overall height66.9 in
Wheelbase112.6 in
Curb weight3781 lb
Track (front / rear)66.5 / 66.1 in
Weight distribution (front / rear)59/41

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

Independent road tests for the Blazer of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

6.1–8.1 sec0–60 mph (tested)quickest 6.10 sec — 2019 RS
YearTrim / engine0–60¼ mileHPDrivetrain
2019RS 3.6L V66.10 sec14.60 sec308 hpAWD
2019RS 3.6L V66.10 sec14.70 sec308 hpAWD
2019Premier 3.6L V66.20 sec14.80 sec308 hpAWD
2019RS 3.6L V66.30 sec15.00 sec308 hpAWD
2019Cloth 2.5L I-48.10 sec16.30 sec193 hpFWD
2023RS 3.6L V66.60 sec15.10 sec308 hpAWD

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 5.28 qt of 0W-20 engine oil, Dot 3 brake fluid. Torque lug nuts to 140 ft-lbs. The firing order is 1-3-4-2.

Lubricants & capacities

Automatic Transmission FluidATF
Automatic Transmission Fluid Capacity5.3 - 6.3 QTS
Brake FluidDot 3
Brake Fluid Capacity2.11 pt
Engine Coolant Capacity9.0 qt
Engine Coolant Capacity9.5 qt
Engine Coolant Capacity11.4 qt
Engine Oil0W-20

Engine torques

Crankshaft Position (CKP) Sensor Bolt(s)6.25 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)6.25 ft-lbs
Crankshaft Position (CKP) Sensor Bolt(s)7.4 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)7.4 ft-lbs
Engine Coolant Temperature (ECT) Sensor Bolt(s)6.6 ft-lbs
Oxygen (O2S) Sensor Bolt(s)31.0 ft-lbs
Knock Sense (KS) Bolt(s)27.0; Sensor with Harness: 11.0 ft-lbs
Oxygen (O2S) Sensor Bolt(s)31.0 ft-lbs

Chassis torques

Lug Nuts140 ft-lbs
Transfer Case Fill Plug29.0 ft-lbs
Transfer Case Drain Plug29.0 ft-lbs
Automatic Transmission Drain Plug8.83 ft-lbs

Ignition

Cylinder Firing Order1-2-3-4-5-6
Cylinder Firing Order1-3-4-2
Spark Plug ManufacturerAC Delco
Spark Plug Gap.028-.031 in
Spark Plug Torque13 ft-lbs
Spark Plug ManufacturerAC Delco
Spark Plug Gap.037-.043 in
Spark Plug Torque15 ft-lbs

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.5 lbs
Oil GroupPAG
Oil Capacity4.2 oz
Standard BCI Cranking Performance720 cca

Service checks

Key ON Engine OFF (KOEO)50.0-94.0
RPM43.0-58.0 rpm
Key ON Engine OFF (KOEO)50.0-94.0
RPM43.0-58.0 rpm

Brakes

Brake Caliper Bolt to Carrier TorqueFront: 23.0-; Rear: 30.0 ft-lbs
ABS Sensor Torque6.4
Minimum Pad Thickness0.078 in
Vented Rotor Minimum Thickness for ReplacementFront: 1.063; Rear: .827
Vented Rotor Minimum Thickness after RefinishFront: 1.102; Rear: .866
Variation from Parallelism Thickness VariationFront: .001; Rear: .002
Maximum Rotor Runout.002"

Multi-step torque procedures OEM · verified

Camshaft Sprocket and/or Gear Bolt(s) — tightening sequence 1 stages
137.0 ft. lbs., Step 2: 28°37 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118.0 ft. lbs., Step 2: 75°18 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118.0 ft. lbs., Step 2: 110°18 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118.0 ft. lbs., Step 2: 110°18 ft. lbs
Cylinder Head — tightening sequence 1 stages
1Bolts 1-1022 ft. lbs
Cylinder Head — tightening sequence 1 stages
122.0 ft. lbs., Step 2: 190°22 ft. lbs
Cylinder Head — tightening sequence 1 stages
1M8 Bolts11 ft. lbs
Flex or Driveplate Bolts — tightening sequence 1 stages
115.0 ft. lbs., Step 2: 70°15 ft. lbs
Flex or Driveplate Bolts — tightening sequence 1 stages
122.0 ft. lbs., Step 2: 40°22 ft. lbs
Flex or Driveplate Bolts — tightening sequence 1 stages
122.0 ft. lbs., Step 2: 45°22 ft. lbs
Intake Manifold to Engine Bolts — tightening sequence 1 stages
1Bolts 1-73.7 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 97,500 mi.

Every 7,500 miAccelerator Pedal (inspect) · Body Latches, Locks & Hinges (lubricate) · Brake Shift Interlock Solenoid (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Engine Air Filter Element (inspect)
Every 15,000 miWindshield Wiper Blade (replace)
Every 22,500 miCabin Air Filter (replace)
Every 45,000 miFuel Evaporative Emission Control System (inspect)
Every 75,000 miHood Hinge (inspect)
Every 97,500 miSpark Plug Wires (inspect) · Spark Plugs (replace)
At 150,000 miAccessory Drive Belt (inspect) · Drive Axle Assembly (drain & refill)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The current generation of Chevrolet Blazer experienced a peak in consumer complaints in 2020 (211), followed by a steady decline through 2026. The 2021 model year represents the start of this downward trend, reporting 123 complaints, 1 recall, and 810 TSBs, which is a significant improvement over the 211 complaints and 3 recalls seen in 2020. The most frequent complaint areas for 2021 were the Electrical System and Service Brakes with 13 reports each, followed by the Engine with 12, though the data does not specify the root causes. Safety records for the target year include 5 crash complaints and 1 fire complaint. While complaints continue to drop in subsequent years, such as 43 in 2022, the 2021 model is considerably more stable than the 2019-2020 period. This makes 2021 a good year to buy as it marks the inflection point toward improved reliability for this generation.

1
Open recalls
NHTSA campaigns
810
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
123
Owner complaints
5 involved a crash · 1 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★★
Side★★★★★
Rollover★★★★★
Owner complaints by model year NHTSA · this generation & adjacent
’90’91’92’93’94’95’96’97’98’99’00’01’02’03’04’05’06’07’08’19’20’21’22’23’24’25’26

Owner complaints filed with NHTSA, by component

All 123 complaints on record, top 8 components.

Electrical System13
Service Brakes13
Engine12
Fuel/Propulsion System9
Power Train7
Steering6
Unknown Or Other6
Electrical System,Engine4

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

20V811000Seat BeltsReported 23/12/2020

General Motors, LLC (GM) is recalling certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra 1500, 2500 and 3500, Yukon, Yukon XL, Cadillac Escalade and Escalade ESV and Chevrolet Blazer, Camaro, Colorado… Remedy: GM will notify owners, and dealers will replace the suspect bolts, free of charge. The recall began January 29, 2021. Owners may contact GMC customer service at 1-800-462-8785…

Technical service bulletins NHTSA · verified

Showing 5 of 810 bulletins on record with NHTSA.

BulletinDateComponentSummary
PIT5966F2026-06-23Unknown Or OtherThis Preliminary information communicates an issue with an OTA pending message still…
PIC6423A2026-05-11Unknown Or OtherPi created to provide GM dealers with information on gathering information for projection…
PIC6551B2026-05-11Unknown Or OtherThis Preliminary information communicates to dealer to perform a MEC reset for wireless…
PIT3271Q2026-04-01Unknown Or OtherThis preliminary information communicates information about how to determine if a wheel…
N25-2505522026-03-20Unknown Or OtherImprovements to OnStar functionality.

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific Blazer. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group O batteryVehicles taking 5.28 qtEngine oil filter 25206377Engine air filter 23321606Spark plug 12680074Battery 88864542

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBsOBD-II trouble codesTorque specificationsMaintenance schedulesFluid capacities & specs

Frequently asked

How much oil does the 2021 Blazer take?

5.28 qt of Dexos1 Gen 2 0W-20, per the factory manual.

Does the 2021 Blazer have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.