ChevroletTrailblazer 2WD2003Overview/chevrolet/trailblazer-2wd/2003/base/

2003 Chevrolet Trailblazer 2WD

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Trailblazer 2WD.

Body SUVTransmission Automatic 4-spd

The 2003 Chevrolet Trailblazer 2WD is a body-on-frame SUV equipped with a 4-speed automatic transmission, requiring 7.0 quarts of 5W-30 oil for its powertrain. Its EPA fuel economy ratings of 15 mpg city, 21 mpg highway, and 17 mpg combined reflect the vehicle's standard specifications for that model year. As a 2003 model, it represents a specific point in the Trailblazer's production run, with maintenance requirements defined by its 7.0-quart oil capacity and 5W-30 viscosity.

Quick specs

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

Engine oil capacity7.0 qtOEM · verified
Engine oil type5W-30 APIOEM · verified
Lug nut torque100 ft-lbsOEM · verified
EPA fuel economy15/21/17 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 78 · 600 CCA battery, OE oil filter 12731179. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known. 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 78 · 600 CCAOEM · verified
Tire sizeENVOY, TRAILBLAZER LS 4WD P245-70R16;BLAZER P235-75R15OEM · verified
Wheel / rim7-J, 7-J, 7-J inOEM · verified

OE service part numbers OEM · verified

Engine oil filter12731179
Engine air filter19239713
Fuel filter19368932 discontinued
Spark plug12681663
Battery88866306 alt 88866121
Front wiper blades15214346
Serpentine belt12593774
Thermostat12561155 alt 12620112

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Dimensions & weight NHTSA vPIC

Overall length191.7 in
Overall width74.4 in
Overall height72 in
Wheelbase113 in
Curb weight4442 lb
Track (front / rear)62.2 / 62.2 in
Weight distribution (front / rear)54/46

Ratings & economy EPA / vPIC

EPA city / highway / combined15 / 21 / 17 mpg
DrivetrainRear-Wheel Drive
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

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

This engine holds 7.0 qt of 5W-30 API engine oil, 75W-90 · GL-5 in the differential. Torque lug nuts to 100 ft-lbs, the oil drain plug to 19.0 ft-lbs. The firing order is 1-5-3-6-2-4.

Lubricants & capacities

Differential Gear OilSYNTHETIC · 75W-90 · GL-5
Differential Gear Oil Capacity3.6 qt
Differential Gear Oil75W-90 · GL-5
Differential Gear Oil Capacity4.3 qt
Engine Oil5W-30 · API
Engine Oil Capacity7.0 qt
Engine Oil5W-30 · API
Engine Oil Capacity7.0 qt

Engine torques

Engine Oil Pan Drain Plug18.0 ft-lbs
Engine Oil Pan Drain Plug19.0 ft-lbs
Engine Valve Cover Bolts9.0 ft-lbs

Chassis torques

Lug Nuts100 ft-lbs

Ignition

Cylinder Firing Order1-5-3-6-2-4
Spark Plug ManufacturerAC Delco
Spark Plug TypeAC 41-981
Spark Plug Gap0.050 in
Spark Plug Torque13.0 ft-lbs
Spark Plug ManufacturerAC Delco
Spark Plug TypeAC 41-985
Spark Plug Gap0.060 in

Battery & A/C

RefrigerantR134a
Oil GroupPAG
Oil Type46
Standard BCI Group Number78
Standard BCI Cranking Performance600 cca
Standard BCI Group Number78
Standard BCI Cranking Performance600 cca

Service checks

Pressure Test15 psi
Radiator Cap Pressure Relief15 psi
Thermostat Opening Temperature188-206 °F
Pressure Test15 psi
Radiator Cap Pressure Relief15 psi
Thermostat Opening Temperature188-206 °F
Fuel Pump Pressure Minimum50.0 psi
Fuel Pump Pressure Maximum57.0 psi

Brakes

Brake ApplicationWITH FOUR WHEEL DISC / WITH STANDARD
Torque to Knuckle77 ft-lbs / 52 ft-lbs / 38 ft-lbs
Brake ApplicationWITH FOUR WHEEL DISC / WITH STANDARD
Torque to Knuckle77 ft-lbs / 52 ft-lbs / 38 ft-lbs
Minimum Pad ThicknessFront: 0.030; Rear: 0.030 specification
Brake ApplicationWITH FOUR WHEEL DISC / WITH STANDARD
Rotor Max Parallel Variation0.001 in
Rotor Runout Limit0.002 in

Multi-step torque procedures OEM · verified

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
1110 ft. lbs., step 2: 180110 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 100,000 mi; coolant at 150,000 mi. The big-interval services (at 150,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 7,500 miAxle Shaft Oil Seal (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level) · Tire & Wheel Assembly (rotate)
Every 30,000 miEngine Air Filter Element (replace) · Fuel Filter (replace)
Every 50,000 miTransfer Case Assembly (drain & refill)
Every 100,000 miPCV Valve (inspect) · Spark Plug Wires (inspect) · Spark Plugs (replace) · Transmission Fluid & Filter (replace)
At 150,000 miAccessory Drive Belt (inspect) · Engine Coolant System (drain, flush & 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.

9
Open recalls
NHTSA campaigns
698
Service bulletins
Manufacturer communications
9
ODI investigations
Office of Defects Investigation
1,266
Owner complaints
0 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★★

No owner complaints on record with NHTSA for this vehicle.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

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 Trailblazer 2WD. 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.

Reference guides

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

Frequently asked

How much oil does the 2003 Trailblazer 2WD take?

7.0 qt of 5W-30 API, per the factory manual.

Does the 2003 Trailblazer 2WD have open recalls?

NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Trailblazer 2WD get?

EPA figures are 15 city / 21 highway / 17 combined mpg.